Method, device, equipment and medium for quantitatively evaluating salt migration of compound landscape

Abstract

This invention provides a method, apparatus, equipment, and medium for quantitative assessment of salinity migration in composite landscapes. The method includes: acquiring landscape unit distribution information and groundwater monitoring well distribution information within each landscape unit of the composite landscape within a target time period; analyzing soil salinity storage changes, salinity centroid location, and lateral water-salt flux of groundwater based on the landscape unit distribution information and groundwater monitoring well distribution information within each landscape unit to determine multidimensional characteristic parameters of water-salt migration in the composite landscape; determining the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water-salt migration in the composite landscape to obtain salinity migration assessment results; and implementing zoned management and optimized water resource management based on the salinity migration assessment results. This invention realizes the transformation from single static monitoring to dynamic multidimensional characteristic analysis, providing refined quantitative indicators for accurately assessing the laws of water-salt transport.

Description

Technical Field

[0001] This invention relates to the field of agricultural water and soil engineering technology, and in particular to a method, apparatus, equipment and medium for quantitative assessment of salt migration in composite landscapes. Background Technology

[0002] In arid and semi-arid irrigated areas, multiple factors, including irrigation, evaporation, drainage, and groundwater level fluctuations, work together to influence the leaching, migration, and enrichment of salts in the soil. Simultaneously, lateral exchange of groundwater between different land use types may cause a redistribution of salts among adjacent landscape units, resulting in a certain degree of heterogeneity in the spatial distribution of salts.

[0003] Existing methods for assessing soil salinity mostly focus on a single land use type. They typically employ single-point or single-profile soil sampling and long-term monitoring to obtain parameters such as soil salinity in different soil layers. These parameters are used to analyze the vertical distribution characteristics and temporal changes of soil salinity. Some methods introduce parameters such as groundwater depth and groundwater mineralization to analyze the impact of groundwater on soil salinity transport and estimate lateral water or salinity migration under specific conditions.

[0004] However, the above methods mostly focus on a single landscape unit or local area scale. Their lateral migration analysis usually serves to explain local processes and is difficult to uniformly characterize and comprehensively distinguish water and salt migration processes between different landscape units at the scale of composite landscapes. Especially under the conditions of composite landscapes where multiple land use types such as farmland, woodland, and grassland coexist, the salt migration process is not only affected by vertical water and salt transport, but is also closely related to the lateral water exchange process driven by groundwater level differences between adjacent landscape units. The above methods are difficult to effectively quantify and uniformly characterize this cross-unit interaction. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for quantitative assessment of salinity migration in complex landscapes. It addresses the shortcomings of existing technologies that focus on single landscape units or localized areas, making it difficult to effectively quantify and uniformly characterize the cross-unit interactive effects. By combining multi-source basic data on surface landscape patterns and groundwater structures to extract multi-dimensional feature parameters, it achieves a shift from static monitoring to dynamic multi-dimensional feature analysis. This provides refined quantitative indicators for accurately assessing water and salt transport patterns, generating scientific assessment results that can be directly applied to zonal governance and resource management, thus realizing a closed loop from monitoring and analysis to decision-making and implementation.

[0006] This invention provides a method for quantitatively assessing salinity migration in a composite landscape, comprising: acquiring landscape unit distribution information and groundwater monitoring well distribution information within each landscape unit of the composite landscape within a target time period; analyzing soil salinity storage changes, salinity centroid location, and lateral groundwater-salt flux based on the landscape unit distribution information and groundwater monitoring well distribution information within each landscape unit within the target time period, and determining multidimensional characteristic parameters of water-salt migration in the composite landscape; and determining the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water-salt migration in the composite landscape, thereby obtaining the salinity migration assessment result.

[0007] According to the present invention, a method for quantitatively assessing salinity migration in a composite landscape is provided. Based on the distribution information of landscape units and the distribution information of groundwater monitoring wells within each landscape unit within a target time period, the method analyzes changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater to determine multidimensional characteristic parameters of water-salt migration in the composite landscape. This includes: determining the salinity storage per unit area of ​​each landscape unit at any given time within the target time period based on the distribution information of landscape units within each landscape unit and the salinity storage per unit area of ​​each landscape unit within the target time period; determining the vertical and horizontal salinity centroids of each landscape unit based on the distribution information of landscape units within each landscape unit within the target time period and the salinity storage per unit area of ​​each landscape unit; determining the lateral water flux and lateral salt flux of groundwater at each time point based on the distribution information of groundwater monitoring wells within each landscape unit within the target time period; and obtaining multidimensional characteristic parameters of water-salt migration in the composite landscape based on the salinity storage per unit area of ​​each landscape unit at all times within the target time period, the vertical and horizontal salinity centroids of each landscape unit, and the lateral water flux and lateral salt flux of groundwater at all times within the target time period.

[0008] According to the present invention, a method for quantitatively assessing salinity migration in a composite landscape is provided. Based on the distribution information of landscape units within each landscape unit within a target time period and the salinity storage per unit area of ​​each landscape unit, the method determines the vertical and horizontal salinity centroids of each landscape unit. The method includes: obtaining the coordinates of each landscape unit along a first direction perpendicular to the ground and the coordinates of each landscape unit along a second direction parallel to the ground based on the distribution information of landscape units within each landscape unit within the target time period; obtaining the soil thickness of each landscape unit based on the first direction coordinates; determining the first salinity storage of each landscape unit at any given time within the target time period based on the salinity storage per unit area and the soil thickness of each landscape unit; obtaining the vertical salinity centroid of each landscape unit based on the first salinity storage and salinity storage per unit area of ​​each landscape unit at all times within the target time period; determining the second salinity storage of each landscape unit at any given time within the target time period based on the salinity storage per unit area and the second direction coordinates of each landscape unit; and obtaining the horizontal salinity centroid of each landscape unit based on the second salinity storage and salinity storage per unit area of ​​each landscape unit at all times within the target time period.

[0009] According to the present invention, a method for quantitatively assessing salinity migration in a composite landscape is provided. Based on the distribution information of groundwater monitoring wells within each landscape unit within a target time period, the method determines the lateral migration flux of groundwater and the lateral migration flux of salt at each moment. The method includes: for any moment within the target time period, determining the groundwater level, depth, and salinity of each landscape unit at that moment based on the distribution information of groundwater monitoring wells within each landscape unit within the target time period; determining the water level difference between adjacent landscape units at that moment based on the groundwater level of each landscape unit at that moment; determining the well distance between adjacent landscape units at that moment based on the distribution information of groundwater monitoring wells within each landscape unit at that moment; determining the hydraulic gradient between landscape units at that moment based on the water level difference and well distance between adjacent landscape units at the same moment; obtaining the lateral migration flux of groundwater at that moment based on the hydraulic gradient between landscape units at that moment, combined with the aquifer conductivity and effective saturated layer thickness at that moment; and obtaining the lateral migration flux of salt at that moment based on the lateral migration flux of groundwater at that moment, combined with the salinity at the same moment.

[0010] According to the present invention, a method for quantitatively assessing the migration of salt in a composite landscape is provided. Based on the distribution information of landscape units at any time within a target time, the method determines the salt storage per unit area of ​​each landscape unit at the corresponding time. The method includes: obtaining the coordinates of each landscape unit along a first direction perpendicular to the ground and the landscape area of ​​each landscape unit based on the distribution information of landscape units within each landscape unit within the target time, and determining the soil layer thickness of each landscape unit; determining the corresponding soil salinity based on the corresponding detected soil electrical conductivity of the landscape unit at any time within the target time, and determining the corresponding salt storage per unit area by combining the corresponding soil layer thickness and the detected soil bulk density.

[0011] According to the present invention, a quantitative assessment method for salinity migration in a composite landscape is provided. Based on multidimensional characteristic parameters of water-salt migration in the composite landscape, the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape are determined to obtain salinity migration assessment results. This includes: obtaining the salinity migration type and salinity state of each landscape unit based on the unit area salinity storage of each landscape unit at each time point in the multidimensional characteristic parameters of water-salt migration in the composite landscape; determining the difference in salinity accumulation between shallow and deep layers for each landscape unit based on the vertical salinity centroid of each landscape unit in the multidimensional characteristic parameters of water-salt migration in the composite landscape; and determining the salinity accumulation difference between shallow and deep layers for each landscape unit based on the salinity storage per unit area of ​​each landscape unit at each time point in the multidimensional characteristic parameters of water-salt migration in the composite landscape. The landscape level salinity centroid of each landscape unit is determined to identify the landscape units in which the salinity centers are relatively located, thus identifying landscape units with high salinity accumulation. Based on the salinity migration type and salinity status of each landscape unit, as well as the differences in salinity accumulation between shallow and deep layers and the high salinity accumulation landscape units, the spatiotemporal distribution characteristics of salinity in the composite landscape are determined. Based on the lateral groundwater flux and lateral salt flux corresponding to each time point in the multidimensional characteristic parameters of water-salt migration in the composite landscape, the lateral flux of the composite landscape is determined. Based on the spatiotemporal distribution characteristics of salinity in the composite landscape and the lateral flux of the composite landscape, the salinity migration assessment results are generated.

[0012] According to the present invention, a method for quantitatively assessing salinity migration in a composite landscape generates salinity migration assessment results based on the spatiotemporal distribution characteristics of salinity in the composite landscape and the lateral flux of the composite landscape. The method includes: determining the landscape units that output salinity as salinity source areas and the landscape units that receive salinity as salinity sink areas based on the lateral flux of the composite landscape, and constructing a water-salt source-sink relationship map consistent with the landscape; coupling the salinity status of each landscape unit in the spatiotemporal distribution characteristics of salinity in the composite landscape with the water-salt source-sink relationship map of the composite landscape to obtain the salt accumulation driving mechanism discrimination results for each landscape unit; and generating salinity migration assessment results including the driving mechanism type, main salt accumulation layers, and salinity transport paths based on the salt accumulation driving mechanism discrimination results of each landscape unit, the differences in salinity accumulation in shallow and deep layers of each landscape unit, and landscape units with high salinity accumulation.

[0013] The present invention also provides a device for quantitative assessment of salinity migration in a composite landscape, comprising: a data acquisition module for acquiring landscape unit distribution information of the composite landscape and groundwater monitoring well distribution information within each landscape unit of the composite landscape within a target time period; a feature determination module for analyzing soil salinity storage changes, salinity centroid location, and lateral groundwater salinity flux based on the landscape unit distribution information and groundwater monitoring well distribution information within each landscape unit within the target time period, and determining multidimensional characteristic parameters of water-salt migration in the composite landscape; and a quantitative assessment module for determining the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water-salt migration in the composite landscape, and obtaining salinity migration assessment results.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the quantitative assessment method for salinity migration in a composite landscape as described above.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the quantitative assessment method for salinity migration in composite landscapes as described above.

[0016] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the quantitative assessment method for salinity migration in composite landscapes as described above.

[0017] The present invention provides a method, apparatus, equipment, and medium for quantitative assessment of salinity migration in composite landscapes. By acquiring distribution information of landscape units and groundwater monitoring wells, it provides multi-source basic data covering surface landscape patterns and groundwater hydrological structures for analysis. This avoids neglecting the coupling of surface and groundwater data, which can lead to a disconnect between simulated and real environments. Furthermore, it comprehensively analyzes changes in reserves, center of gravity location, and lateral flux to extract multi-dimensional characteristic parameters, achieving a shift from single static monitoring to dynamic multi-dimensional characteristic analysis. This addresses the problem of limited dimensions in describing water and salt transport processes and the lack of spatiotemporal dynamic evolution characterization. It provides refined quantitative indicators for accurately assessing water and salt transport patterns, thereby determining lateral flux and spatiotemporal distribution characteristics based on multi-dimensional characteristic parameters, generating scientific assessment results that facilitate subsequent zonal governance and resource management. This avoids resource waste caused by low technology application conversion rates and a lack of targeted governance measures, significantly improving the scientific nature and effectiveness of regional ecological governance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the quantitative assessment method for salinity migration in composite landscapes provided by the present invention. Figure 2 This is a schematic diagram of salt storage per unit area in different landscapes and different months provided by the present invention; Figure 3 This is a schematic diagram of the changes in salt content per unit area in adjacent months for different landscapes, provided by the present invention. Figure 4 This is a schematic diagram of the changes in the centroid of soil salinity in different vertical and horizontal landscapes provided by the present invention; Figure 5 This is a schematic diagram of the changes in groundwater level and groundwater depth in different landscape units provided by the present invention; Figure 6 This is a schematic diagram of water flux per unit width of landscape under different aquifer hydraulic conductivity K conditions provided by the present invention; Figure 7 This is a schematic diagram of salt flux per unit width of landscape under different aquifer hydraulic conductivity K conditions provided by the present invention; Figure 8 This is a schematic diagram of the structure of the composite landscape salt migration quantitative assessment device provided by the present invention; Figure 9 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Figure 1 This is a flowchart illustrating the quantitative assessment method for salinity migration in composite landscapes provided by the present invention, as shown below. Figure 1 As shown, the method includes the following: S11, Obtain the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells in each landscape unit of the composite landscape within the target time period; S12. Based on the distribution information of landscape units within the target time and the distribution information of groundwater monitoring wells within each landscape unit, analyze the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater to determine the multidimensional characteristic parameters of water-salt migration in the composite landscape. S13. Based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape are determined, and the salinity migration assessment results are obtained.

[0022] It should be noted that the step number "S1N" in this manual does not represent the sequential order of the methods for quantitative assessment of salt migration in complex landscapes. The following details will explain this in conjunction with... Figures 2-7 This invention describes a method for quantitatively assessing salinity migration in composite landscapes.

[0023] Step S11: Obtain the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells in each landscape unit of the composite landscape within the target time period.

[0024] It should be noted that a composite landscape includes at least two landscape units, and the types of landscape units include at least two of farmland, woodland and wasteland. For example, a composite landscape includes a first woodland landscape unit, a second woodland landscape unit, a first farmland landscape unit, a second farmland landscape unit, a first wasteland landscape unit and a second wasteland landscape unit. The specific types can be determined according to the actual area to be studied, and no further restrictions are made here.

[0025] In addition, the landscape unit distribution information includes the coordinates of each landscape unit along a first direction perpendicular to the ground, the coordinates of a second direction parallel to the ground, and the location of the landscape unit boundary. The location of the landscape unit boundary includes the landscape area, which represents the total area of ​​landscape units of the same type.

[0026] Step S12: Based on the distribution information of landscape units within the target time and the distribution information of groundwater monitoring wells within each landscape unit, analyze the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater to determine the multidimensional characteristic parameters of water-salt migration in the composite landscape.

[0027] In this embodiment, based on the distribution information of landscape units within the target time and the distribution information of groundwater monitoring wells within each landscape unit, the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater are analyzed to determine the multidimensional characteristic parameters of water-salt migration in the composite landscape. This includes: determining the salinity storage per unit area of ​​each landscape unit at any given time within the target time based on the distribution information of landscape units within each landscape unit and the salinity storage per unit area of ​​each landscape unit within the target time; determining the vertical and horizontal salinity centroids of each landscape unit based on the distribution information of landscape units within each landscape unit within the target time and the salinity storage per unit area of ​​each landscape unit; determining the lateral water flux and lateral salt flux of groundwater at each time based on the distribution information of groundwater monitoring wells within each landscape unit within the target time; and obtaining the multidimensional characteristic parameters of water-salt migration in the composite landscape based on the salinity storage per unit area of ​​each landscape unit at all times within the target time, the vertical and horizontal salinity centroids of each landscape unit, and the lateral water flux and lateral salt flux of groundwater at all times within the target time.

[0028] It should be noted that by analyzing the distribution information of landscape units, the quantification and spatial discretization of salt storage within composite landscapes are achieved. Macroscopic distribution information is transformed into measurable specific indicators, providing fundamental data support for subsequent analysis of water and salt transport. By constructing vertical and horizontal salt centroids within the landscape, the enrichment locations and evolution trends of salt in the vertical and horizontal directions can be accurately depicted from a spatial geometric perspective. This intuitively reflects the distribution pattern of salt in soil profiles and surface space, overcoming the limitation that relying solely on total analysis is insufficient to reveal the spatial heterogeneity of salt distribution. Furthermore, lateral water and salt fluxes are calculated using groundwater monitoring well distribution information. The quantitative analysis of material exchange flux between the groundwater system and the surface landscape system effectively reveals the driving role of lateral groundwater flow on regional water-salt balance, solving the problem of difficulty in accurately assessing the impact of lateral groundwater movement on surface salt accumulation or leaching. This allows for multi-dimensional fusion analysis of surface salt reserves, salt centroid, and groundwater lateral flux, constructing a composite characteristic parameter system encompassing time and space, and surface and subsurface data. This ensures a comprehensive reflection of the dynamic process of water-salt migration while also revealing the coupling mechanism of groundwater movement on the spatiotemporal distribution pattern of surface salt, significantly improving the systematicness and accuracy of understanding regional water-salt transport patterns.

[0029] Specifically, based on the distribution information of landscape units at any time within the target time period, the salt content per unit area of ​​each landscape unit at the corresponding time is determined, including: based on the distribution information of landscape units within each landscape unit within the target time period, obtaining the coordinates of each landscape unit along the first direction perpendicular to the ground and the landscape area of ​​each landscape unit, and determining the soil layer thickness of each landscape unit; based on the landscape unit at any time within the target time period, based on the corresponding detected soil electrical conductivity, determining the corresponding soil salt content, and combining the corresponding soil layer thickness and the detected soil bulk density, determining the corresponding salt content per unit area.

[0030] It should be noted that by extracting the directional coordinates perpendicular to the ground to accurately calculate the soil layer thickness, the vertical spatial geometric dimensions of salt accumulation are accurately quantified, overcoming the volume calculation errors caused by topographic undulations or uneven soil layers. This provides a basic spatial geometric parameter for the accurate measurement of salt reserves. Furthermore, by introducing soil bulk density parameters, the salt content calculated based on electrical conductivity is combined with the soil's physical density and soil layer thickness for calculation. This achieves an accurate conversion from soil salt content (concentration) to salt reserves per unit area, avoiding the deviation in quality estimation caused by relying solely on salt content while ignoring differences in soil compaction. This significantly improves the physical rigor and data accuracy of salt reserve calculations, facilitating comparative analysis of salt change characteristics in different landscape units and at different times. This accurately reflects the macroscopic scale of salt accumulation within each landscape unit, providing a reliable quantitative indicator for regional-scale water-salt balance analysis.

[0031] It should be added that, for any landscape unit, the corresponding salt storage per unit area is expressed as: E=Y×B×R Where E represents the salt storage per unit area corresponding to the landscape unit, in kg / m². 2 Y represents the soil salinity corresponding to the landscape unit, in g / kg; The soil electrical conductivity value, measured using a soil-to-water ratio of 1:5, is expressed in μS / cm. R represents the soil layer thickness, expressed in cm. Soil layer thickness characterizes the vertical distance from the land surface to a specific soil boundary (such as bedrock, groundwater, or the interface between soils of different textures), and is relevant to the specific study area. n represents the number of sample points, in units of samples; B represents the soil bulk density, in kg / m³. 3 Soil bulk density is used to characterize the dry weight of a unit volume of undisturbed soil (including soil particles and pores), and can be obtained by the ring sampler method.

[0032] Specifically, obtaining soil bulk density using the ring cutter method includes: at the monitoring point of the corresponding landscape unit, a ring cutter (a metal cylinder) of known volume is vertically pressed into the soil to prevent damage to the natural soil structure, and the ring cutter is carefully dug out. The soil protruding at both ends of the ring cutter is leveled with a soil trimmer to ensure accurate ring cutter volume; the ring cutter containing wet soil is immediately weighed to obtain the weight of the wet soil and the ring cutter; all the soil inside the ring cutter is poured into an aluminum box and placed in an oven (usually 105℃) to dry to constant weight to obtain the dry soil weight; the soil bulk density is obtained based on the dry soil weight and the ring cutter volume.

[0033] In addition, based on the distribution information of landscape units within each landscape unit during the target time and the salt storage per unit area of ​​each landscape unit, the vertical and horizontal salt centroids of each landscape unit are determined, including: obtaining the coordinates of each landscape unit along a first direction perpendicular to the ground and the coordinates of each landscape unit along a second direction parallel to the ground based on the distribution information of each landscape unit within each landscape unit during the target time, and obtaining the soil thickness of each landscape unit based on the first direction coordinates of each landscape unit; determining the first salt storage of each landscape unit at any given time during the target time based on the salt storage per unit area and the soil thickness of each landscape unit; obtaining the vertical salt centroid of each landscape unit based on the first salt storage and salt storage per unit area of ​​each landscape unit at all times during the target time; determining the second salt storage of each landscape unit at any given time during the target time based on the salt storage per unit area and the second direction coordinates of each landscape unit; and obtaining the horizontal salt centroid of each landscape unit based on the second salt storage and salt storage per unit area of ​​each landscape unit at all times during the target time.

[0034] It should be noted that by extracting vertical and horizontal coordinates, a three-dimensional spatial framework of the landscape unit is constructed and the soil layer thickness is precisely quantified. This avoids the inability to accurately describe the spatial location of salt due to a lack of detailed spatial geometric information, providing an accurate geometric benchmark for subsequent calculation of the centroid coordinates. Furthermore, by combining the salt storage per unit area with the soil layer thickness, the first salt storage is calculated, achieving stratified accumulation of salt mass in the vertical direction. This accurately reflects the salt occurrence state at different soil depths, providing quantitative intermediate data for analyzing the vertical salt distribution pattern. Based on long-term vertical salt data, the vertical centroid is calculated to intuitively reveal the dynamic evolution trend of salt in the soil profile—whether it is surface accumulation, basal accumulation, or downward migration due to leaching. Overcoming the limitations of traditional static analysis in capturing vertical migration direction, this study provides a scientific basis for determining the depth of the main soil layers where salinization occurs. By combining salt reserves per unit area with horizontal coordinates, it achieves a spatial mapping of salt mass, accurately reflecting the cumulative distribution of salt at different surface locations and providing data support for analyzing the source-sink relationship of salt in the horizontal direction. Simultaneously, based on long-term series horizontal salt data, it calculates the horizontal centroid to reveal the spatial migration path of regional salt distribution (such as convergence from highlands to lowlands or shifts with the direction of groundwater flow), avoiding the lack of overall control over the spatial movement pattern of regional salt, and thus effectively supporting the understanding of the surface salt redistribution mechanism driven by lateral groundwater flow.

[0035] Furthermore, the vertical salinity centroid of the landscape unit is represented as: Where Z represents the vertical salinity centroid of the landscape unit, in meters (m); E represents the salinity storage per unit area of ​​the landscape unit, in kg / m². 2 ; I represents the soil layer thickness, in cm.

[0036] The landscape horizontal salinity centroid of a landscape unit is represented as: Where X represents the landscape horizontal salinity centroid of the landscape unit; E represents the salinity storage per unit area of ​​the landscape unit, in kg / m². 2 G represents the second directional coordinate of the landscape unit.

[0037] Furthermore, based on the distribution information of groundwater monitoring wells within each landscape unit within the target time period, the lateral migration water flux and lateral migration salt flux of groundwater at each moment are determined, including: for any moment within the target time period, based on the distribution information of groundwater monitoring wells within each landscape unit within the target time period, determining the groundwater level, burial depth, and salinity of each landscape unit at the corresponding moment; determining the water level difference between adjacent landscape units at the corresponding moment based on the groundwater level of each landscape unit at the corresponding moment; determining the well distance between adjacent landscape units at the corresponding moment based on the distribution information of groundwater monitoring wells within each landscape unit at the corresponding moment; determining the hydraulic gradient between landscape units at the corresponding moment based on the water level difference and well distance between adjacent landscape units at the same moment; obtaining the lateral migration water flux of groundwater at the corresponding moment based on the hydraulic gradient between landscape units at the corresponding moment, combined with the aquifer conductivity and effective saturated layer thickness at the corresponding moment; and obtaining the lateral migration salt flux at the corresponding moment based on the lateral migration water flux of groundwater at the corresponding moment, combined with the salinity at the same moment.

[0038] It should be noted that by fully utilizing monitoring well data and simultaneously acquiring key parameters reflecting the dynamic state (water level, depth) and chemical characteristics (mineralization) of groundwater, we can achieve simultaneous and accurate perception of the driving factors and material basis of water and salt transport. This avoids the analytical bias caused by a single data source. By calculating the water level difference and spatial distance between adjacent units, we can quantify the geometric boundary conditions of groundwater flow, providing basic data for accurately characterizing the strength of hydrodynamic connections between different landscape units. Based on the water level difference and well distance, we can calculate the hydraulic gradient to accurately characterize the direction and intensity of the driving force of lateral groundwater flow, overcoming the limitation that water level alone cannot accurately determine the flow rate. Furthermore, by combining hydraulic gradient, hydraulic conductivity, and effective saturated layer thickness, lateral water flux is calculated, effectively taking into account the permeability of the soil medium and the influence of the actual water flow cross section on the flow. This allows for a quantitative characterization of the lateral groundwater flux between landscape units, thereby enhancing the quantitative characterization of the lateral groundwater exchange process. It enables the physical mechanism calculation of lateral groundwater flow and further couples the lateral water flux (hydraulic process) with mineralization (hydrochemical process) to achieve direct quantification of the flux of groundwater salt migration with water flow. This accurately reflects the contribution of groundwater movement to the regional salt redistribution, thus effectively assessing the degree of impact of lateral groundwater flow on surface soil salinization.

[0039] It should be added that the distribution information of groundwater monitoring wells includes the distribution location of groundwater monitoring wells relative to the corresponding landscape unit, the ground elevation of the monitoring well, the probe length, the rope length, the distance from the probe to the water surface, the distance from the wellhead to the ground surface, the distance from the rope end to the wellhead, the burial depth, and the mineralization. Based on the distribution location of groundwater monitoring wells relative to the corresponding landscape unit, the distance between two adjacent monitoring wells can be determined. The burial depth represents the vertical distance from the ground surface (wellhead) to the groundwater surface (water table). The burial depth can be determined based on the difference between the wellhead elevation and the groundwater level elevation. The mineralization represents the total amount of various ions, molecules, and compounds contained in the groundwater. The mineralization can be calculated based on the conductivity detected by the Diver probe in the groundwater monitoring well within the landscape unit, combined with an empirical coefficient, or obtained by taking samples on-site and sending them to the laboratory for chemical analysis. The specific choice can be made according to the actual design requirements, and no further restrictions are imposed here.

[0040] In addition, the groundwater level is obtained from the Diver probes in the groundwater monitoring wells within each landscape unit, and the groundwater level is expressed as: h = H - (T + SM - N + Q) Where h represents the groundwater level in meters (m); H represents the ground elevation of the monitoring well in meters (m); T represents the probe length in meters (m); S represents the rope length in meters (m); M represents the distance from the probe to the water surface in meters (m); N represents the distance from the wellhead to the ground in meters (m); and Q represents the distance from the rope end to the wellhead in meters (m).

[0041] Furthermore, the lateral migration flux of groundwater is expressed as: P=W×K×V W=ΔH / L Where P represents the lateral water flux per unit width between two adjacent landscape units, i.e., the lateral migration flux of groundwater, in meters. 2 / d; W represents the hydraulic gradient between the two corresponding landscape units; ΔH represents the water level difference between the two corresponding landscape units, in meters; L represents the well distance between the two corresponding landscape units, in meters; K represents the hydraulic conductivity of the aquifer; V represents the effective saturated layer thickness.

[0042] Furthermore, the hydraulic conductivity of an aquifer can be determined through field pumping tests, permeability coefficient (K) estimation, or particle analysis. Specifically: field pumping tests involve pumping water at a constant flow rate in a well, observing the water level drop in surrounding observation wells, and using the Theis formula or Jacob formula to inversely calculate the hydraulic conductivity based on the pumping flow rate, the change in water level drawdown over time, and the distance between the well and the observation wells; permeability coefficient (K) estimation determines the hydraulic conductivity by multiplying the measured permeability coefficient of the aquifer by the soil layer thickness; particle analysis involves collecting undisturbed soil samples from the aquifer, performing particle analysis to determine the soil texture, then referring to the empirical range of permeability coefficients for the corresponding texture in a hydrogeological handbook to estimate the hydraulic conductivity.

[0043] In practical design, the hydraulic conductivity of an aquifer is related to the type of sediment. When the sediment type is clay, the hydraulic conductivity K ranges from 0.0001 to 0.01; when the sediment type is silt / loess, the range is 0.01 to 0.1; when the sediment type is silt-silt type unconfined aquifer, the range is 0.05 to 0.5; when the sediment type is fine sand, the range is 0.5 to 2; when the sediment type is medium sand, the range is 2 to 10; and when the sediment type is gravel, the range is 10 to 100.

[0044] In addition, the effective saturation layer thickness can be determined in the following three cases: When the groundwater level is less than the top depth of the filter pipe, the entire filter pipe is below the water surface. In this case, the entire filter pipe is in the saturation zone. It is usually approximated that the effective saturation layer thickness is equal to the length of the filter pipe, and the top depth of the filter pipe represents the distance from the ground surface to the top of the filter pipe. When the groundwater level is greater than or equal to the top depth of the filter pipe, but less than or equal to the bottom depth of the filter pipe, the upper part of the filter pipe is in the vadose zone (dry), and the lower part is in the saturated zone. In this case, only the part of the filter pipe below the water surface participates in groundwater flow. The effective thickness should be the distance from the bottom of the filter pipe to the groundwater surface, which is the difference between the bottom depth of the filter pipe and the groundwater level. The bottom depth of the filter pipe represents the distance from the ground surface to the bottom of the filter pipe. When the groundwater level is greater than the bottom depth of the filter pipe, the entire filter pipe is exposed to air (vadose zone), there is no water in the well, and the effective saturation layer thickness is equal to 0. In this case, the groundwater does not flow or cannot be observed through the well, and the flux cannot be calculated.

[0045] Furthermore, the lateral migration salt flux is expressed as: J = P × F Where J represents the lateral salt flux between two landscape units, i.e., the lateral migration salt flux, in units of kg / (m·d); P represents the lateral water flux per unit width between two adjacent landscape units, i.e., the lateral migration groundwater flux, in units of m. 2 / d; F represents the groundwater salinity during the same period, in kg / m³. 3 .

[0046] Step S13: Based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, determine the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape, and obtain the salinity migration assessment results.

[0047] In this embodiment, based on the multidimensional characteristic parameters of water-salt migration in the composite landscape, the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape are determined, and the salinity migration assessment results are obtained. This includes: determining the salinity migration type and salinity state of each landscape unit based on the unit area salinity storage of each landscape unit at each time point in the multidimensional characteristic parameters of water-salt migration in the composite landscape; determining the differences in salinity accumulation between shallow and deep layers for each landscape unit based on the vertical salinity centroid of each landscape unit in the multidimensional characteristic parameters of water-salt migration in the composite landscape; and determining the differences in salinity accumulation between shallow and deep layers for each landscape unit based on the landscape level of each landscape unit in the multidimensional characteristic parameters of water-salt migration in the composite landscape. The salinity centroid is determined by identifying the relative locations of salinity centers at each landscape level within the corresponding landscape units, thus identifying high-salinity accumulation landscape units. Based on the salinity migration type and state of each landscape unit, as well as the differences in salinity accumulation between shallow and deep layers and the high-salinity accumulation landscape units, the spatiotemporal distribution characteristics of salinity in the composite landscape are determined. The lateral flux of the composite landscape is determined based on the corresponding groundwater lateral migration water flux and lateral migration salt flux at each time point in the multidimensional characteristic parameters of water-salt migration in the composite landscape. Finally, based on the spatiotemporal distribution characteristics of salinity in the composite landscape and its lateral flux, a salinity migration assessment result is generated.

[0048] It should be noted that by analyzing the changing trends of salt reserves, the complex dynamic process is abstracted into specific migration types and salt states. This allows for the quantitative differentiation of salt migration processes in composite landscape systems and the quantitative identification of soil salinity states in each landscape unit. Furthermore, by utilizing the vertical salt centroid index, the specific enrichment layers of salt in the soil profile (such as surface or basal accumulation) are accurately identified. This makes the assessment of the degree of salinization hazard more closely aligned with the actual soil environment of plant root activity. Additionally, by locating the spatial position of the horizontal salt centroid, the convergence areas of salt at the regional scale are accurately revealed, facilitating the rapid identification of high-salinity accumulation hotspots in landscape units. This allows for a comprehensive analysis of temporal evolution trends, spatial horizontal distribution, and vertical stratification differences. This study constructs a three-dimensional, full-cycle spatiotemporal distribution characteristic of salinity, solving the information fragmentation problem caused by single-dimensional analysis. It comprehensively reproduces the complex dynamic process of water and salt transport within complex landscapes. By quantifying the specific contribution of groundwater lateral flow to regional water and salt balance, it clarifies the intensity of groundwater as an active lateral recharge or discharge pathway. This addresses the problem that existing technologies often neglect or struggle to estimate the impact of groundwater lateral flow on surface salinization, enhancing the depth of analysis of the driving mechanism of water and salt transport. Furthermore, by combining macroscopic spatiotemporal distribution characteristics with microscopic lateral flux mechanisms, it generates a comprehensive assessment result that includes both phenomenon description and causal analysis. This overcomes the deficiency of single-phenomenon assessment lacking mechanistic support, significantly improving the scientific rigor and practicality of the assessment results in guiding regional integrated water and soil resource management.

[0049] It should be added that, when determining the salt migration type and salt status of each landscape unit, the salt storage per unit area of ​​each landscape unit at each time point is determined based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, thereby determining the changing trend of salt storage per unit area of ​​each landscape unit, and thus obtaining the salt migration type and salt status of each passed unit.

[0050] Furthermore, the types of salt migration include growth, outflow, and redistribution. Specifically, if the total salt reserves of the system increase, it is determined to be growth type; if the total salt reserves of the system decrease and there is salt output to the outside of the system, it is determined to be outflow type; if the total salt reserves of the system remain basically unchanged, it is determined to be redistribution type.

[0051] In addition, salinity status includes salt accumulation status, desalination status and equilibrium status. Specifically, if the salinity of each landscape unit increases over time, it is determined to be in salt accumulation status; if it decreases over time, it is determined to be in desalination status; and if it remains basically unchanged, it is determined to be in equilibrium status.

[0052] In addition, the results of salt migration assessment are used to identify the types of salt migration in the composite landscape system (growth type, outflow type, redistribution type) and the salt status of each landscape unit (desalination, salt accumulation, equilibrium state) based on changes in soil salt storage and salt centroid analysis. Furthermore, the differences in shallow and deep soil salt content in different landscapes and the landscape units with high salt accumulation are identified. Combined with the lateral migration of groundwater and salt flux, the water and salt migration process between different landscape units is quantitatively characterized.

[0053] Specifically, the salt migration assessment results include overall system trend identification, landscape unit functional positioning, vertical distribution and risk level, and quantitative lateral flux pathways. Among these: overall system trend identification clarifies the current stage of the entire composite landscape system, indicating whether it is a continuous increase in total salt content (growth type, requiring vigilance), total salt discharge (external discharge type, effective remediation), or salt migration between different plots; landscape unit functional positioning clarifies the spatial role of each landscape unit, including salt source areas and salt sink areas. Salt source areas represent the landscape... The unit outputs salt through groundwater or drainage (usually a desalination zone); the salt sink area is used to indicate that the landscape unit receives and accumulates salt (usually a high-salinity accumulation landscape unit); vertical distribution and risk level are used to determine whether salt accumulates on the surface (which is extremely harmful to crop roots and urgently needs leaching) or seeps into deeper layers (which may pollute groundwater), thus identifying the vertical target for remediation; the lateral flux quantitative path is used to characterize the specific path and flow of salt movement, for example, "Plot A laterally transports X cubic meters of water and Y tons of salt to plot B every day".

[0054] Furthermore, based on the spatiotemporal distribution characteristics of salinity in the composite landscape and its lateral flux, a salinity migration assessment result is generated, including: identifying salinity source areas and salinity sink areas based on the lateral flux of the composite landscape, and constructing a water-salt source-sink relationship map consistent with the landscape; coupling the salinity status of each landscape unit in the spatiotemporal distribution characteristics of salinity in the composite landscape with the water-salt source-sink relationship map of the composite landscape to obtain the salt accumulation driving mechanism discrimination result for each landscape unit; and generating a salinity migration assessment result including the driving mechanism type, main salt accumulation layers, and salinity transport paths based on the salt accumulation driving mechanism discrimination result for each landscape unit, the differences in salt accumulation between shallow and deep layers in each landscape unit, and landscape units with high salt accumulation.

[0055] It should be noted that, based on the dynamic identification of salt output source areas and receiving sink areas using lateral flux, a visualized water-salt source-sink relationship map is constructed. This clarifies the direction of material transport and supply-demand relationship between different landscape units, intuitively revealing the flow path and spatial correlation of salt within the region. By coupling the salt state (such as salt accumulation or desalination) with the source-sink relationship, a deep diagnosis of the causes of salt accumulation is achieved, ensuring an effective distinction between salt accumulation caused by local evaporation and concentration or by lateral inflow of external groundwater. This overcomes the deficiency of single-phenomenal analysis in revealing the underlying driving mechanism, improves the mechanistic depth of the assessment, and further integrates multi-dimensional information such as driving mechanisms, vertical distribution layers, and spatial transport paths to generate a comprehensive and specific salt migration assessment result. This addresses the problem that existing assessment results often have single parameters, lack systematicity, and are not instructive, providing detailed and scientific decision-making basis for formulating precise improvement measures (such as deep drainage and cutting off lateral recharge).

[0056] It should be added that the coupling analysis includes causal identification for landscape units in a salinization state, functional identification for landscape units in a desalination state, and dynamic identification for landscape units in a equilibrium state.

[0057] Specifically, for landscape units in a state of salt accumulation, the causes are determined, including: when a landscape unit is identified as a salt sink area based on the water-salt source-sink relationship map, the salt accumulation in the landscape unit is determined to be mainly caused by lateral water and salt input from external landscape units, and its driving type is determined to be lateral recharge-dominated; when a landscape unit is not identified as a salt sink area, the salt accumulation in the landscape unit is determined to be mainly caused by vertical evaporation or irrigation input from local groundwater, and its driving type is determined to be vertical evaporation-dominated.

[0058] In addition, functional identification is performed on landscape units in a desalination state, including: when a landscape unit is identified as a salt source area based on the water-salt source-sink relationship map, it is determined that the landscape unit outputs salt to the outside through leaching or runoff, and its functional type is determined to be a system salt discharge area; when a landscape unit is not identified as a salt source area, it is determined that the landscape unit removes salt from the root activity layer through crop absorption or downward leaching, and its functional type is determined to be vertical leaching type.

[0059] In addition, dynamic identification is performed on landscape units in equilibrium, including: analyzing the magnitude of lateral groundwater migration flux and lateral salt migration flux of the landscape unit based on the water-salt source-sink relationship map; if the landscape unit has significant lateral water-salt flux, i.e., the absolute value of the flux is greater than a preset threshold, then the landscape unit is determined to be a water-salt transit channel; if the lateral water-salt flux of the landscape unit is close to zero, then the landscape unit is determined to be a water-salt stable zone.

[0060] In addition, based on the identification results of salt accumulation driving mechanisms for each landscape unit, the differences in salt accumulation between shallow and deep layers in each landscape unit, and the landscape units with high salt accumulation, a salt migration assessment result is generated, including the type of driving mechanism, the main salt accumulation layers, and salt transport paths. This includes: constructing a connectivity link from landscape units identified as salt source areas to those identified as salt sink areas based on the markings of each landscape unit in the salt accumulation driving mechanism identification results; determining the connectivity link as a salt transport path; and identifying the terminal nodes of the salt transport path and the landscape units marked as having high salt accumulation as key salt accumulation areas; and correlating the salt accumulation driving mechanism identification results with the spatial location of each landscape unit to generate a spatial distribution of driving mechanisms. Figure; where the driving mechanism types are divided into lateral recharge-dominated, vertical evaporation-dominated, and natural leaching-dominated types; based on the differences in salt accumulation in shallow and deep layers of each landscape unit, the vertical salt centroid of each landscape unit is calculated; if the vertical salt centroid is above the preset soil boundary depth, the main salt accumulation layer of the landscape unit is determined to be shallow; if the vertical salt centroid is below the preset soil boundary depth, the main salt accumulation layer of the landscape unit is determined to be deep; the salt transport path, key salt accumulation areas, spatial distribution map of driving mechanisms, and the main salt accumulation layer corresponding to each landscape unit are integrated to generate a salt migration assessment result that includes the system salt flow trajectory, the causes of salt accumulation in each region, and the risk depth.

[0061] It should be added that for landscape units identified as being in a state of salt accumulation, if the driving mechanism is upstream lateral water flow, they are marked as lateral recharge-dominant type; if the driving mechanism is upward evaporation controlled by groundwater level depth, they are marked as vertical evaporation-dominant type.

[0062] In the actual study, it was assumed that the composite landscape consisted of four sequentially adjacent landscape units: forest land (T1), forest land (T2), farmland (T3), farmland (T4), grassland (T5), and grassland (T6). Two soil monitoring points and one groundwater monitoring well were set up in each landscape unit. The forest land area was 1350 m². 2 The landscape area of ​​the farmland is 13,500 m². 2 The wasteland landscape area is 10,800 m². 2 .

[0063] like Figure 2 As shown, the salt content per unit area in forest land and farmland is low (generally <2.71 kg / m²). 2The salinity of shallow soils was slightly higher than that of deeper soils (July-September), with relatively small overall fluctuations. Grassland had high salt reserves per unit area and exhibited active spatiotemporal dynamics, showing significant salt accumulation in summer (July-September) and deep soils. Overall, the total salinity of the system increased from June to August and decreased from August to November. The overall salt migration pattern was efflux, with grassland playing a dominant role in the changes in total salinity. At the end of the study, the salt efflux rate was 40.9%. Figure 3 As shown, by analyzing the changes in salt storage per unit area of ​​each landscape in adjacent months, the salt status of each landscape is mainly in a desalination state, while the salt accumulation state mainly occurs in woodlands and grasslands in June and July. At the end of the study, the 0-150 cm soil layer of each landscape was in a desalination state. The calculated desalination rates of woodlands, farmland, and grasslands were 53.1%, 65.6%, and 30.3%, respectively.

[0064] Depend on Figure 4 As shown, the vertical soil salinity centroid varies across different landscapes, with grassland > farmland > woodland, and the fluctuation baselines being 50, 60, and 70 m, respectively. The high salinity accumulation depth in grassland is higher than that in farmland and woodland. The location of the horizontal soil salinity centroid in different landscapes indicates that the horizontal salinity centroid is mainly concentrated in grassland, suggesting that grassland has a higher salinity accumulation.

[0065] Figure 5 The study showed fluctuations in groundwater levels and depths across different landscapes. Woodlands and farmlands exhibited high synchronicity. In terms of groundwater level, both woodlands and farmlands were mainly concentrated at 987 m, with woodlands slightly higher than farmlands, while grasslands were mainly concentrated at 985 m. Regarding groundwater depth, both woodlands and farmlands were mainly concentrated above 1.2 m, while grasslands were mainly concentrated at 1.7 m. Compared to grasslands, the groundwater depth in woodlands and farmlands was shallower, indicating that the study area belonged to the shallow groundwater zone.

[0066] Based on engineering hydrology knowledge and considering different aquifer sediment types, a range of aquifer hydraulic conductivity values ​​was pre-defined. In this study, the farmland-woodland-grassland area is primarily a silty loam-silt type unconfined aquifer; therefore, the aquifer hydraulic conductivity was taken as 0.1~0.5 m / d. Figure 5 Under different groundwater levels in different landscapes, lateral groundwater flow is mainly characterized by flow from woodland to farmland, and from farmland to grassland, with the flow from farmland to grassland being significantly higher than that from woodland to farmland. Using K=0.3 m / d as a baseline, from... Figure 6 It can be seen that the monthly lateral migration of groundwater per unit width into farmland from forest land is approximately 0.08 m. 2 / month, while the monthly lateral migration of groundwater per unit width from farmland to wasteland is approximately 0.20 m. 2 / Month, wasteland serves as a sink for lateral groundwater flow. From June to November, the cumulative lateral water flux per unit width from woodland to farmland and from farmland to wasteland were 0.42 and 1.36 m, respectively. 2 .

[0067] like Figure 7 As shown, high salinity lateral fluxes between landscapes are mainly concentrated in June and July. Based on K=0.3 m / d, the salinity lateral flux per unit width from forest to farmland decreased monthly from 1.00 kg / (m·month) in June, eventually stabilizing at 0.10 kg / (m·month). The salinity lateral flux per unit width from farmland to grassland decreased monthly from 1.80 kg / (m·month) in June, eventually stabilizing at 0.45 kg / (m·month). The cumulative salinity flux per unit width from forest to farmland and from farmland to grassland from June to November were 2.05 and 4.87 kg / m, respectively.

[0068] Based on the actual research, the salt migration type of the farmland-woodland-grassland composite landscape system is outward discharge, with a salt outward discharge rate of 40.9% at the end of the study. This indicates that the salt content of the composite landscape system is decreasing. During the study period, the salt status of the 0-150cm soil layer in each landscape unit was in a desalination state, except for the woodland and grassland which showed salt accumulation in June and July. The overall desalination rates of woodland, farmland, and grassland at the end of the study were 53.1%, 65.6%, and 30.3%, respectively. The vertical salt centroid fluctuation benchmarks for woodland, farmland, and grassland were 50, 60, and 70 m, respectively. The high salt accumulation depth in grassland was higher than that in farmland and woodland, and the horizontal salt centroid was mainly concentrated in grassland, indicating that grassland had a higher salt accumulation. The lateral flow of groundwater showed that it flowed from woodland to farmland and from farmland to grassland, and the hydraulic gradient from woodland to farmland was lower than that from farmland to grassland. Based on a permeability coefficient K=0.3 m / d, the cumulative lateral groundwater flux per unit width between forest land and farmland and between farmland and wasteland from June to November is 0.42 m and 1.36 m, respectively. 2 The cumulative lateral salt flux per unit width was 2.05 and 4.87 kg / m, respectively.

[0069] In one optional embodiment, after obtaining the salt migration assessment results, the process includes zonal management and water resource optimization based on the salt migration assessment results, specifically: adjusting irrigation and drainage systems based on the salt migration assessment results for precise irrigation and drainage; and / or optimizing land use layout based on the salt migration assessment results to achieve landscape planning; and / or regulating regional water and salt balance based on the salt migration assessment results to achieve macro-management.

[0070] Furthermore, adjustments to irrigation and drainage systems are made, including: for landscape units with salt accumulation or high salt sinks, if the assessment finds that a landscape unit is a major salt accumulation area (salt sink area) with extremely high shallow salinity, the irrigation leaching quota for that landscape unit can be increased (more water to wash away salt), or the drainage ditches / culverts of that plot can be densified to accelerate salt removal; for landscape units with desalination or salt source areas, if a landscape unit is desalinating and has a large salt output, the irrigation water volume can be appropriately reduced to save water resources and prevent excessive waste.

[0071] In addition, optimizing land use layout includes: if the assessment finds that a landscape unit is a long-term stable salt sink (significantly affected by lateral groundwater), it should not be planned for planting high-value economic crops or farmland with poor salt tolerance, but should be adjusted to woodland, grassland or ecological wetland to use its salt tolerance characteristics for ecological interception to avoid risks; if it is found that the salt in one landscape unit is flowing laterally to another landscape unit, a biological interception zone (such as a salt-absorbing plant zone) or an infiltration ditch can be set up between the two plots to block the lateral salt migration path.

[0072] In addition, regional water and salt balance regulation includes: controlling regional groundwater levels: if the assessment results show that the system is growing and lateral exchange is strong, it indicates that the regional groundwater level is generally too high. Based on this, the amount of water diverted from the Yellow River / diverted can be adjusted, or the group wells can be opened for strong drainage to lower the overall groundwater level and reduce groundwater evaporation and salt accumulation; based on the assessed migration flux, a model can be established to predict the salt distribution trend in the future and issue early warnings of secondary soil salinization.

[0073] In summary, this invention provides multi-source basic data covering both surface landscape patterns and groundwater hydrological structures by acquiring landscape unit distribution information and groundwater monitoring well distribution information. This avoids neglecting the disconnect between simulated and real environments caused by the coupling of surface and groundwater data. Furthermore, by comprehensively analyzing changes in reserves, center of gravity location, and lateral flux, multi-dimensional characteristic parameters are extracted, achieving a shift from single static monitoring to dynamic multi-dimensional characteristic analysis. This addresses the problem of a single dimension in describing water-salt transport processes and the lack of spatiotemporal dynamic evolution characterization. It provides refined quantitative indicators for accurately assessing water-salt transport patterns, thereby determining lateral flux and spatiotemporal distribution characteristics based on multi-dimensional characteristic parameters, generating scientific evaluation results that facilitate subsequent zonal governance and resource management. This avoids resource waste caused by low technology application conversion rates and a lack of targeted governance measures, significantly improving the scientific nature and effectiveness of regional ecological governance.

[0074] The present invention provides a quantitative assessment device for salt migration in composite landscapes. The quantitative assessment device for salt migration in composite landscapes described below can be referred to in correspondence with the quantitative assessment method for salt migration in composite landscapes described above.

[0075] Figure 8 A schematic diagram of a composite landscape salt migration quantitative assessment device is shown. The device includes: Data acquisition module 81 acquires the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells in each landscape unit of the composite landscape within the target time period. The feature determination module 82 analyzes the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater based on the distribution information of landscape units within the target time and the distribution information of groundwater monitoring wells in each landscape unit, and determines the multidimensional feature parameters of water-salt migration in the composite landscape. The quantitative assessment module 83 determines the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, and obtains the salinity migration assessment results.

[0076] It should be noted that the specific principles of the embodiments of the present invention are the same as those of the method embodiments described above. For details, please refer to the method embodiments above. More detailed explanations will not be repeated here.

[0077] Figure 9 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 9 As shown, the electronic device may include: a processor 910, a communication interface 920, a memory 930, and a communication bus 940. The processor 910, communication interface 920, and memory 930 communicate with each other via the communication bus 940. The processor 910 can call logical instructions in the memory 930 to execute a quantitative assessment method for salinity migration in a composite landscape. This method includes: acquiring the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells within each landscape unit in the composite landscape within a target time period; analyzing changes in soil salinity reserves, the location of the salinity centroid, and the lateral water-salt flux of groundwater based on the distribution information of landscape units and the distribution information of groundwater monitoring wells within each landscape unit within the target time period to determine multidimensional characteristic parameters of water-salt migration in the composite landscape; and determining the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water-salt migration in the composite landscape to obtain the salinity migration assessment results.

[0078] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0079] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the quantitative assessment method for salinity migration in composite landscapes provided by the above methods. The method includes: acquiring the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells in each landscape unit within the composite landscape within a target time period; analyzing the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater based on the distribution information of landscape units in the target time period and the distribution information of groundwater monitoring wells in each landscape unit, and determining the multidimensional characteristic parameters of water-salt migration in the composite landscape; and determining the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water-salt migration in the composite landscape, thereby obtaining the salinity migration assessment result.

[0080] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the quantitative assessment method for salinity migration in composite landscapes provided by the methods described above. The method includes: acquiring landscape unit distribution information of the composite landscape and groundwater monitoring well distribution information within each landscape unit of the composite landscape within a target time period; analyzing soil salinity storage changes, salinity centroid location, and lateral groundwater-salt flux based on the landscape unit distribution information and groundwater monitoring well distribution information within each landscape unit within the target time period, and determining multidimensional characteristic parameters of water-salt migration in the composite landscape; and determining the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water-salt migration in the composite landscape, thereby obtaining salinity migration assessment results.

[0081] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0082] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for quantitatively assessing salinity migration in a complex landscape, characterized in that, include: Obtain the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells in each landscape unit of the composite landscape within the target time period; Based on the distribution information of landscape units within the target time period and the distribution information of groundwater monitoring wells within each landscape unit, the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater are analyzed to determine the multidimensional characteristic parameters of water-salt migration in the composite landscape. Based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape are determined, and the salinity migration assessment results are obtained.

2. The method for quantitative assessment of salinity migration in composite landscapes according to claim 1, characterized in that, Based on the distribution information of landscape units within the target time period and the distribution information of groundwater monitoring wells within each landscape unit, the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater are analyzed to determine the multidimensional characteristic parameters of water-salt migration in the composite landscape, including: Based on the distribution information of landscape units at any time within the target time period, determine the salt storage per unit area of ​​each landscape unit at the corresponding time. Based on the distribution information of landscape units within each landscape unit within the target time period and the salt storage per unit area of ​​each landscape unit, the vertical salt centroid and horizontal salt centroid of each landscape unit are determined. Based on the distribution information of groundwater monitoring wells in each of the landscape units within the target time period, determine the lateral migration water flux and lateral migration salt flux of groundwater at each time point; Based on the unit area salt storage of each landscape unit at all times within the target time period, the vertical and horizontal salt centroids of each landscape unit, and the lateral groundwater migration flux and lateral salt migration flux at all times within the target time period, multidimensional characteristic parameters of composite landscape water and salt migration are obtained.

3. The method for quantitative assessment of salinity migration in composite landscapes according to claim 2, characterized in that, Based on the distribution information of landscape units within each landscape unit within the target time period and the salinity per unit area of ​​each landscape unit, the vertical salinity centroid and horizontal salinity centroid of each landscape unit are determined, including: Based on the distribution information of the landscape units within each landscape unit within the target time period, the coordinates of each landscape unit along a first direction perpendicular to the ground and a second direction parallel to the ground are obtained, and the soil layer thickness of each landscape unit is obtained based on the first direction coordinates of each landscape unit. Based on the salt content per unit area in each landscape unit at any time within the target time and the soil thickness of each landscape unit, determine the first salt content of each landscape unit at the corresponding time. Based on the first salinity storage of each landscape unit at all times within the target time and the salinity storage per unit area, the vertical salinity centroid of each landscape unit is obtained. Based on the unit area salt content within each landscape unit at any given time within the target time and the second directional coordinates of each landscape unit, determine the second salt content of each landscape unit at the corresponding time. Based on the second salinity reserves of each landscape unit at all times within the target time and the salinity reserves per unit area of ​​the landscape, the landscape horizontal salinity centroid of each landscape unit is obtained.

4. The method for quantitative assessment of salinity migration in composite landscapes according to claim 2, characterized in that, Based on the distribution information of groundwater monitoring wells within each of the landscape units within the target time period, determine the lateral migration water flux and lateral migration salt flux of groundwater at each time point, including: For any moment within the target time period, based on the distribution information of groundwater monitoring wells in each of the landscape units within the target time period, determine the groundwater level, burial depth, and mineralization of each landscape unit at the corresponding moment. Based on the groundwater level of each landscape unit at the corresponding time, determine the water level difference between adjacent landscape units at the corresponding time; Based on the distribution information of groundwater monitoring wells in each landscape unit at the corresponding time, the distance between wells in adjacent landscape units at the corresponding time is determined; The hydraulic gradient between landscape units at the corresponding time is determined based on the water level difference between adjacent landscape units at the same time and the distance between wells of adjacent landscape units. Based on the inter-scene hydraulic gradient at the corresponding time, combined with the aquifer conductivity and effective saturated layer thickness at the corresponding time, the lateral migration flux of groundwater at the corresponding time is obtained. Based on the lateral migration water flux of groundwater at the corresponding time and the mineralization at the same time, the lateral migration salt flux at the corresponding time is obtained.

5. The method for quantitative assessment of salinity migration in composite landscapes according to claim 2, characterized in that, Based on the landscape unit distribution information at any time within the target time period, determine the salinity per unit area of ​​each landscape unit at the corresponding time, including: Based on the distribution information of the landscape units within each landscape unit within the target time period, the coordinates of each landscape unit along a first direction perpendicular to the ground and the landscape area of ​​each landscape unit are obtained, and the soil layer thickness of each landscape unit is determined. Based on the landscape unit at any time within the target time period, the corresponding soil salinity is determined according to the corresponding detected soil electrical conductivity, and the corresponding salt storage per unit area is determined by combining the corresponding soil layer thickness and the detected soil bulk density.

6. The method for quantitative assessment of salinity migration in composite landscapes according to claim 2, characterized in that, Based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape are determined, and the salinity migration assessment results are obtained, including: Based on the salt storage per unit area of ​​each landscape unit at each time point in the multidimensional characteristic parameters of water and salt migration in the composite landscape, the salt migration type and salt status of each landscape unit are obtained. Based on the vertical salinity centroid of each landscape unit in the multidimensional characteristic parameters of water and salt migration in the composite landscape, the difference in salinity accumulation between shallow and deep layers of each landscape unit is determined. Based on the landscape level salinity centroid of each landscape unit in the multidimensional characteristic parameters of water and salt migration in the composite landscape, the landscape unit in which each landscape level salinity centroid is located is determined, and the landscape unit with high salinity accumulation is obtained. Based on the salt migration type and salt status of each landscape unit, as well as the differences in salt accumulation between shallow and deep layers and the landscape units with high salt accumulation, the spatiotemporal distribution characteristics of salt in the composite landscape are determined. Based on the lateral migration water flux and lateral migration salt flux of the groundwater at each time point in the multidimensional characteristic parameters of water and salt migration in the composite landscape, the lateral flux of the composite landscape is determined. Based on the spatiotemporal distribution characteristics of salinity in the composite landscape and the lateral flux of the composite landscape, a salinity migration assessment result is generated.

7. The method for quantitative assessment of salinity migration in composite landscapes according to claim 6, characterized in that, Based on the spatiotemporal distribution characteristics of salinity in the composite landscape and the lateral flux of the composite landscape, a salinity migration assessment result is generated, including: Based on the lateral flux of the composite landscape, the landscape unit that outputs salt is identified as the salt source area, and the landscape unit that receives salt is identified as the salt sink area, thus constructing a water-salt source-sink relationship map that conforms to the landscape. The salinity status of each landscape unit in the spatiotemporal distribution characteristics of the composite landscape is coupled with the water-salt source-sink relationship map of the composite landscape to obtain the discrimination results of the salt accumulation driving mechanism of each landscape unit. Based on the salt accumulation driving mechanism identification results of each landscape unit, the differences in salt accumulation between shallow and deep layers of each landscape unit, and the landscape units with high salt accumulation, a salt migration assessment result is generated, which includes the driving mechanism type, main salt accumulation layers, and salt migration paths.

8. A device for quantitatively assessing salinity migration in a composite landscape, characterized in that, include: The data acquisition module acquires the distribution information of landscape units in the composite landscape and the distribution information of groundwater monitoring wells in each landscape unit of the composite landscape within the target time period. The feature determination module analyzes the changes in soil salinity storage, the location of the salinity centroid, and the lateral water-salt flux of groundwater based on the distribution information of landscape units within the target time period and the distribution information of groundwater monitoring wells within each landscape unit, and determines the multidimensional feature parameters of water-salt migration in the composite landscape. The quantitative assessment module determines the lateral flux and spatiotemporal distribution characteristics of salinity in the composite landscape based on the multidimensional characteristic parameters of water and salt migration in the composite landscape, and obtains the salinity migration assessment results.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the quantitative assessment method for salinity migration in composite landscapes as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the quantitative assessment method for salinity migration in composite landscapes as described in any one of claims 1 to 7.

Images