Inland river basin water resource quantity accurate evaluation system and method

Abstract

The invention relates to the technical field of resource evaluation, in particular to a precise evaluation system and method for the water resource quantity of an inland river basin, and the method comprises the following steps: laying a multi-modal sensor network in the inland river basin, collecting the hydrological characteristic data of the inland river and surrounding wetlands, extracting the inland river-wetland recessive water exchange characteristic indexes, and calculating the water resource quantity of the inland river basin; comprising the wetland groundwater supply amount, the inland river boundary seepage rate and the seasonal water exchange amplitude; based on the inland river-wetland recessive moisture exchange characteristic indexes, establishing an inland river-wetland recessive moisture exchange dynamic model; and embedding the inland river-wetland recessive water exchange dynamic model into an inland river basin water circulation system, and comprehensively calculating the surface water resource quantity and the underground water resource quantity in the basin. According to the method, the wetland consumption part is removed through the recessive moisture exchange between the wetland and the inland river, so that the water resource quantity calculation is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of resource assessment, and in particular to a system and method for accurately assessing the amount of water resources in an inland river basin. Background Art

[0002] Inland river basins are important water resource areas and are widely distributed around the world. Reasonable assessment of inland river water resources is crucial to water resource management, ecological protection and sustainable development. However, existing inland river basin water resource assessment methods often face many technical difficulties, especially under the influence of complex hydrological and ecological environments such as wetlands and lakes, which leads to significant errors in the calculation of water resources.

[0003] Traditional water resource assessment methods are mainly based on the principle of water balance, and calculate the total amount of water resources through indicators such as precipitation, runoff, and evaporation. However, these methods usually ignore the implicit water exchange phenomenon in inland river basins, especially the water interaction between wetlands and inland rivers. The evapotranspiration, seepage and seasonal precipitation recharge factors of wetlands need to be filled by nearby inland rivers through groundwater exchange, which is often not fully considered in traditional water resource assessments, resulting in large deviations in assessment results. Summary of the invention

[0004] The present invention provides a system and method for accurately assessing the amount of water resources in an inland river basin.

[0005] A method for accurately assessing water resources in an inland river basin comprises the following steps:

[0006] S1, Multi-source hydrological ecological data collection and feature extraction:

[0007] A multimodal sensor network is deployed in the inland river basin to collect hydrological characteristic data of the inland river and surrounding wetlands, including inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation. The collected data are processed for spatiotemporal consistency to extract characteristic indicators of implicit water exchange between inland rivers and wetlands, including wetland groundwater recharge, inland river boundary seepage rate and seasonal water exchange amplitude.

[0008] S2, Dynamic modeling of implicit water exchange between inland river and wetland:

[0009] Based on the characteristic indicators of implicit water exchange between inland rivers and wetlands, a dynamic model of implicit water exchange between inland rivers and wetlands was established. This dynamic model includes the infiltration path from inland rivers to wetlands, the impact of wetland evapotranspiration on groundwater levels, and the dynamic process of seasonal precipitation recharge.

[0010] S3, calculation of total water resources in inland river basins:

[0011] The dynamic model of implicit water exchange between inland rivers and wetlands is embedded in the water cycle system of inland river basins to comprehensively calculate the amount of surface water resources and groundwater resources in the basin. Based on the dynamic model of implicit water exchange between inland rivers and wetlands, the deviation of traditional water resources calculation is corrected to obtain the accurate total amount of water resources in the basin.

[0012] Optionally, the multimodal sensor network in S1 specifically includes:

[0013] Inland river water level change monitoring: water level sensors are deployed in various river sections of inland river basins, distributed in river bends, tributary confluences and recharge areas, to collect inland river water level change data in real time;

[0014] Wetland soil moisture monitoring: A grid layout is adopted in the wetland area, and soil moisture sensors are installed. They are buried at multiple soil depths (such as the surface, middle and deep layers), covering typical vegetation areas and exposed areas of the wetland, and collecting wetland soil moisture change data;

[0015] Groundwater level monitoring: Groundwater level sensors are deployed around wetlands and in the hidden water exchange areas between inland rivers and wetlands, focusing on underground seepage paths and recharge sensitive areas to monitor the dynamic changes of groundwater levels;

[0016] Evapotranspiration rate monitoring: eddy covariance systems or lysimeters are deployed at the boundary areas between inland rivers and wetlands and in the core areas of wetlands to monitor the evapotranspiration rate per unit area in real time;

[0017] Precipitation monitoring: Obtain precipitation in inland river basins and wetland areas based on data from the meteorological center.

[0018] Optionally, the extraction of implicit water exchange characteristic indicators between inland rivers and wetlands in S1 specifically includes:

[0019] S11, spatial registration and consistency processing: Based on the geographic information system (GIS) of the inland river basin, a unified spatial reference framework covering the inland river and wetland areas is established, and the collected data on inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation are mapped according to geographic coordinates. The data of discrete collection points are processed into spatial continuity using spatial interpolation algorithms to fill in the missing values ​​in uncovered areas;

[0020] S12, calculation of implicit water exchange characteristic index:

[0021] S121, wetland groundwater recharge: by analyzing the time series changes of wetland soil moisture content and combining the groundwater level fluctuation data, the vertical groundwater recharge per unit area of ​​wetland is calculated using the water balance method;

[0022] S122, Inland river boundary seepage rate: Based on the water level gradient between the inland river water level and the wetland groundwater level, combined with the soil permeability coefficient of the river boundary, the horizontal seepage rate of the inland river boundary is calculated using the two-dimensional groundwater flow model;

[0023] S123, seasonal water exchange amplitude: by analyzing the seasonal change trend of inland river water level and wetland soil moisture content, calculate the difference in water exchange between inland rivers and wetlands during the flood season and the dry season, and quantify the seasonal water exchange amplitude.

[0024] Optionally, the calculation of the wetland groundwater recharge adopts the water balance method to calculate the vertical recharge of the wetland groundwater per unit time: Q w =A s (PER), where Q w is the groundwater recharge to the wetland, A s is the wetland area, P is the precipitation per unit time, E is the evapotranspiration rate per unit time, and R is the surface runoff per unit time;

[0025] The calculation of the inland river boundary seepage rate is based on the gradient between the river water level and the wetland groundwater level, and the horizontal seepage rate per unit time is calculated as: Among them, Q b is the inland river boundary seepage rate, K is the soil permeability coefficient, A b is the seepage cross-sectional area at the inland river boundary, ΔH is the difference between the inland river water level and the wetland groundwater level, and L is the horizontal distance between the inland river boundary and the wetland groundwater recharge area, i.e., the seepage path length;

[0026] The calculation of the seasonal water exchange amplitude is carried out by performing difference calculation on the water exchange data of the flood season and the dry season to determine the seasonal fluctuation amplitude: Q s =|Q wet -Q dry |, where Q s is the seasonal water exchange amplitude, Q wet is the water exchange volume of inland river wetlands during the flood season, Q dry It is the water exchange volume of inland river wetlands during the dry season.

[0027] Optionally, in S2, the wetland groundwater recharge Q w , inland river boundary seepage rate Q b and seasonal water exchange amplitude Q s , as input variables for the dynamic model of inland river-wetland implicit water exchange;

[0028] The inland river-wetland implicit water exchange dynamic model includes an inland river seepage path submodule, a wetland evapotranspiration impact submodule and a seasonal precipitation recharge submodule.

[0029] Optionally, the inland river seepage path submodule uses a two-dimensional groundwater flow equation to simulate the path and flow of inland river seepage to the wetland based on the gradient relationship between the inland river water level and the wetland groundwater level, combined with the boundary permeability coefficient K and the seepage path length L: Among them, K x ,K y are the components of the permeability coefficient in the x and y directions, h is the groundwater level, S is the storage coefficient, t is time, x, y are spatial coordinates, and are partial derivative operators, Indicates the rate of change of the spatial direction, that is, the lateral position

[0030] Response to changes, It represents the rate of change in spatial direction, that is, the response to the change in longitudinal position. represents the water head gradient of the groundwater level in the x direction, represents the hydraulic head gradient of the groundwater level in the y direction, It indicates the rate of change of groundwater level over time and describes the dynamic changes of groundwater level.

[0031] Optionally, the wetland evapotranspiration impact submodule evaluates the dynamic consumption effect of evapotranspiration on the wetland groundwater level, expressed as: Where ΔH is the dynamic change of groundwater level caused by evapotranspiration, E is the evapotranspiration rate of wetlands, and A s is the wetland area, S is the water storage coefficient, Q w is the groundwater recharge of the wetland, and the groundwater level drop caused by evapotranspiration is given by Q w Dynamically correct the recharge amount to ensure the water balance of the wetland.

[0032] Optionally, the seasonal precipitation recharge submodule simulates the dynamic recharge process of seasonal precipitation on the wetland groundwater level, expressed as: Q p =P·A r ·η+Q s , where Q p is the corrected seasonal precipitation recharge, P is the precipitation per unit time, A r is the area of ​​precipitation action, η is the soil infiltration rate, Q s is the seasonal water exchange amplitude.

[0033] Optionally, the calculation of the total amount of water resources in the inland river basin in S3 specifically includes:

[0034] Remove hidden water exchange Q 隐性 : The amount of hidden water exchange removed is calculated by the following formula: Q 隐性 =Q 流失+Q ΔH +Q p , where Q 流失 represents the infiltration volume from inland river to wetland, Q p represents the amount of water replenished to the wetland by seasonal precipitation, Q ΔH is the change in groundwater volume caused by wetland evapotranspiration, calculated by ΔH, through the wetland area A wetland The dynamic change of groundwater level ΔH is converted into water volume using the following formula: Q ΔH =ΔH·A wetland ;

[0035] Calculate the total water resources in the basin: After removing the implicit water exchange, the corrected total water resources in the basin are obtained: W 流域 =W 地表 +W 地下水 -Q 隐性 ; Among them, W 流域 represents the total amount of water resources in inland river basins, W 地表 is the surface water resources, obtained by traditional water resources calculation method, W 地下水 Amount of groundwater resources.

[0036] Q 流失 =Q b ×Ap, where Q b is the horizontal seepage rate, and Ap is the cross-sectional area of ​​the seepage path.

[0037] An inland river basin water resources accurate assessment system, used to implement the above-mentioned inland river basin water resources accurate assessment method, includes the following modules:

[0038] The multi-source hydro-ecological data collection and extraction module is used to deploy a multi-modal sensor network in the inland river basin to collect hydrological characteristic data of the inland river and surrounding wetlands, including inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation, and perform spatiotemporal consistency processing on the collected data to extract the characteristic indicators of implicit water exchange between inland rivers and wetlands, including wetland groundwater recharge, inland river boundary seepage rate and seasonal water exchange amplitude;

[0039] The inland river-wetland implicit water exchange dynamic modeling module is based on the implicit water exchange characteristic indicators between inland rivers and wetlands extracted by the multi-source hydrological and ecological data collection and extraction module to establish an inland river-wetland implicit water exchange dynamic model. The inland river-wetland implicit water exchange dynamic model includes the infiltration path from inland rivers to wetlands, the impact of wetland evapotranspiration on groundwater levels, and the dynamic process of seasonal precipitation recharge;

[0040] The total amount of water resources calculation module embeds the inland river-wetland implicit water exchange dynamic model constructed by the inland river-wetland implicit water exchange dynamic modeling module into the inland river basin water cycle system, and comprehensively calculates the surface water resources and groundwater resources in the basin to obtain the accurate total amount of water resources in the inland river basin.

[0041] Beneficial effects of the present invention:

[0042] The present invention compensates for the deviation of traditional water resource calculation methods by introducing a dynamic model of implicit water exchange between inland rivers and wetlands. In traditional methods, the total amount of water resources often does not take into account the implicit water exchange between inland rivers and wetlands, resulting in large errors in the calculation results. By taking into account factors such as wetland evapotranspiration, inland river seepage and seasonal precipitation recharge, the amount of surface water and groundwater resources in the basin can be accurately calculated, thereby providing more reliable data support for water resource management and scheduling. Through the implicit water exchange between wetlands and inland rivers, the wetland consumption part is eliminated, making the calculation of water resources more accurate.

[0043] The present invention effectively corrects the impact of wetland water consumption on water resources in the basin. The traditional water resource calculation method does not fully consider the consumption of water resources by wetland evapotranspiration, resulting in the loss of wetland water not being taken into account. By introducing the wetland evapotranspiration impact submodule, the dynamic changes of groundwater levels and the consumption of wetland water caused by wetland evapotranspiration are calculated, and this part of water consumption is further supplemented by water sources in inland river basins. It can dynamically evaluate the impact of wetlands on water resources in the basin, and correct it through water source replenishment strategies to ensure the balance of wetland water in the process of water resource evaluation and avoid water resource management errors caused by ignoring wetland evapotranspiration. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 is a schematic diagram of an evaluation method according to an embodiment of the present invention;

[0046] Figure 2 Schematic diagram of an evaluation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0048] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0049] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0050] like Figure 1 As shown, a method for accurately assessing water resources in an inland river basin includes the following steps:

[0051] S1, Multi-source hydrological ecological data collection and feature extraction: Deploy a multimodal sensor network in the inland river basin to collect hydrological characteristic data of the inland river and surrounding wetlands, including inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation, process the collected data for temporal and spatial consistency, and extract the characteristic indicators of implicit water exchange between inland rivers and wetlands, including wetland groundwater recharge, inland river boundary seepage rate and seasonal water exchange amplitude;

[0052] S2, Dynamic modeling of implicit water exchange between inland river and wetland: Based on the characteristic indicators of implicit water exchange between inland river and wetland, a dynamic model of implicit water exchange between inland river and wetland is established. This dynamic model includes the infiltration path from inland river to wetland, the impact of wetland evapotranspiration on groundwater level and the dynamic process of seasonal precipitation recharge;

[0053] S3, calculation of the total amount of water resources in inland river basins: embed the inland river-wetland implicit water exchange dynamic model into the inland river basin water cycle system, and comprehensively calculate the surface water resources and groundwater resources in the basin; based on the inland river-wetland implicit water exchange dynamic model, correct the deviation of traditional water resources calculation and obtain the accurate total amount of water resources in the basin.

[0054] The multimodal sensor network in S1 specifically includes:

[0055] Inland river water level change monitoring: water level sensors are deployed in various river sections of inland river basins, distributed in river bends, tributary confluences and recharge areas, to collect inland river water level change data in real time;

[0056] Wetland soil moisture monitoring: A grid layout is adopted in the wetland area, and soil moisture sensors are installed. They are buried at multiple soil depths (such as the surface, middle and deep layers), covering typical vegetation areas and exposed areas of the wetland, and collecting wetland soil moisture change data;

[0057] Groundwater level monitoring: Groundwater level sensors are deployed around wetlands and in the hidden water exchange areas between inland rivers and wetlands, focusing on underground seepage paths and recharge sensitive areas to monitor the dynamic changes of groundwater levels;

[0058] Evapotranspiration rate monitoring: eddy covariance systems or lysimeters are deployed at the boundary areas between inland rivers and wetlands and in the core areas of wetlands to monitor the evapotranspiration rate per unit area in real time;

[0059] Precipitation monitoring: Obtain precipitation in inland river basins and wetland areas based on data from the meteorological center.

[0060] The specific indicators of implicit water exchange between inland rivers and wetlands in S1 include:

[0061] S11, spatial registration and consistency processing: Based on the geographic information system (GIS) of the inland river basin, a unified spatial reference framework covering the inland river and wetland areas is established, and the collected data on inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation are mapped according to geographic coordinates. The data of discrete collection points are processed into spatial continuity using spatial interpolation algorithms to fill in the missing values ​​of uncovered areas and generate a spatially consistent inland river-wetland hydrological dynamic distribution map;

[0062] The spatial interpolation algorithm is expressed as follows: Among them, Z(x) is the estimated value of the target point x, Z(x i ) is a known point x i The measured value of i is the weight coefficient, which is calculated from the spatial correlation of the known points, and n is the number of known points used for interpolation;

[0063] S12, calculation of implicit water exchange characteristic index:

[0064] S121, wetland groundwater recharge: by analyzing the time series changes of wetland soil moisture content and combining the groundwater level fluctuation data, the vertical groundwater recharge per unit area of ​​wetland is calculated using the water balance method;

[0065] S122, Inland river boundary seepage rate: Based on the water level gradient between the inland river water level and the wetland groundwater level, combined with the soil permeability coefficient of the river boundary, the horizontal seepage rate of the inland river boundary is calculated using the two-dimensional groundwater flow model;

[0066] S123, seasonal water exchange amplitude: by analyzing the seasonal change trend of inland river water level and wetland soil moisture content, calculate the difference in water exchange between inland rivers and wetlands during the flood season and the dry season, and quantify the seasonal water exchange amplitude.

[0067] The calculation of wetland groundwater recharge adopts the water balance method to calculate the vertical recharge of wetland groundwater per unit time: Q w =A s (PER), where Q w is the groundwater recharge to the wetland, A s is the wetland area, P is the precipitation per unit time, E is the evapotranspiration rate per unit time, and R is the surface runoff per unit time;

[0068] The inland river boundary seepage rate is calculated based on the gradient between the river water level and the wetland groundwater level to calculate the horizontal seepage rate per unit time: Among them, Q b is the inland river boundary seepage rate, K is the soil permeability coefficient, A b is the seepage cross-sectional area at the inland river boundary, ΔH is the difference between the inland river water level and the wetland groundwater level, and L is the horizontal distance between the inland river boundary and the wetland groundwater recharge area, i.e., the seepage path length;

[0069] Calculation of seasonal water exchange range The seasonal fluctuation range is determined by performing difference calculation on the water exchange data of the flood season and the dry season: Q s =|Q wet -Q dry |, where Q s is the seasonal water exchange amplitude, Q wet is the water exchange volume of inland river wetlands during the flood season, Q dry It is the water exchange volume of inland river wetlands during the dry season.

[0070] In S2, the wetland groundwater recharge Q w , inland river boundary seepage rate Q band seasonal water exchange amplitude Q s , as input variables for the dynamic model of inland river-wetland implicit water exchange;

[0071] The inland river-wetland implicit water exchange dynamic model includes the inland river seepage path submodule, the wetland evapotranspiration impact submodule and the seasonal precipitation recharge submodule.

[0072] The inland river seepage path submodule uses a two-dimensional groundwater flow equation to simulate the path and flow of inland river seepage to wetlands based on the gradient relationship between the inland river water level and the wetland groundwater level, combined with the boundary permeability coefficient K and the seepage path length L: Among them, K x ,K y are the components of the permeability coefficient in the x and y directions, h is the groundwater level, S is the storage coefficient, t is time, x, y are spatial coordinates, and are partial derivative operators, It represents the rate of change of the spatial direction, that is, the response to the change of the lateral position. It represents the rate of change in spatial direction, that is, the response to the change in longitudinal position. represents the water head gradient of the groundwater level in the x direction, represents the hydraulic head gradient of the groundwater level in the y direction, It indicates the rate of change of groundwater level over time and describes the dynamic changes of groundwater level.

[0073] The boundary percolation rate Q b Substituted into the two-dimensional groundwater flow equation as a boundary condition, it appears in the form of a boundary flow term. The boundary condition can be expressed by the water level difference. Specifically, when solving the groundwater flow equation, the infiltration path between the inland river and the wetland constrains the groundwater flow through the boundary condition. The boundary condition can be expressed as: (at the permeability boundary).

[0074] The wetland evapotranspiration impact submodule evaluates the dynamic depletion effect of evapotranspiration on the wetland groundwater level, expressed as: Where ΔH is the dynamic change of groundwater level caused by evapotranspiration, E is the evapotranspiration rate of wetlands, and A s is the wetland area, S is the water storage coefficient, Q w is the groundwater recharge of the wetland, and the groundwater level drop caused by evapotranspiration is given by Q w Dynamically correct the recharge amount to ensure the water balance of the wetland.

[0075] The seasonal precipitation recharge submodule simulates the dynamic recharge process of seasonal precipitation on the wetland groundwater level, expressed as: Q p =P·A r ·η+Qs , where Q p is the corrected seasonal precipitation recharge, P is the precipitation per unit time, A r is the area of ​​precipitation action, η is the soil infiltration rate, Q s is the seasonal water exchange amplitude, Q s As a correction factor for seasonal moisture dynamics, it reflects the magnitude of changes in precipitation on water exchange between wetlands and inland rivers.

[0076] The calculation of the total amount of water resources in inland river basins in S3 specifically includes:

[0077] Remove hidden water exchange Q 隐性 :When calculating the total amount of water resources in a basin, it is necessary to remove the implicit water exchange from inland rivers to wetlands. Specifically, the amount of implicit water exchange removed is calculated using the following formula: Q 隐性 =Q 流失 +Q ΔH +Q p , where Q 流失 represents the infiltration volume from inland river to wetland, Q p represents the amount of water replenished to the wetland by seasonal precipitation, Q ΔH is the change in groundwater volume caused by wetland evapotranspiration, calculated by ΔH, through the wetland area A wetland The dynamic change of groundwater level ΔH is converted into water volume using the following formula: Q ΔH =ΔH·A wetland ;

[0078] Calculate the total water resources in the basin: After removing the implicit water exchange, the corrected total water resources in the basin are obtained: W 流域 =W 地表 +W 地下水 -Q 隐性 ; Among them, W 流域 represents the total amount of water resources in inland river basins, W 地表 is the surface water resources, obtained by traditional water resources calculation method, W 地下水 The amount of groundwater resources is obtained through traditional groundwater models.

[0079] Q 流失 =Q b ×Ap, where Q b is the horizontal seepage rate, and Ap is the cross-sectional area of ​​the seepage path.

[0080] like Figure 2 As shown, a precise assessment system for water resources in an inland river basin is used to implement the precise assessment method for water resources in an inland river basin, and includes the following modules:

[0081] The multi-source hydro-ecological data collection and extraction module is used to deploy a multi-modal sensor network in the inland river basin to collect hydrological characteristic data of the inland river and surrounding wetlands, including inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation, and perform spatiotemporal consistency processing on the collected data to extract the characteristic indicators of implicit water exchange between inland rivers and wetlands, including wetland groundwater recharge, inland river boundary seepage rate and seasonal water exchange amplitude;

[0082] The inland river-wetland implicit water exchange dynamic modeling module is based on the implicit water exchange characteristic indicators between inland rivers and wetlands extracted by the multi-source hydrological and ecological data acquisition and extraction module to establish an inland river-wetland implicit water exchange dynamic model. The inland river-wetland implicit water exchange dynamic model includes the infiltration path from inland rivers to wetlands, the impact of wetland evapotranspiration on groundwater levels, and the dynamic process of seasonal precipitation recharge, so as to accurately simulate and predict the exchange and flow of water in the basin;

[0083] The total amount of water resources calculation module embeds the inland river-wetland implicit water exchange dynamic model constructed by the inland river-wetland implicit water exchange dynamic modeling module into the inland river basin water cycle system, and comprehensively calculates the surface water resources and groundwater resources in the basin to obtain the accurate total amount of water resources in the inland river basin.

[0084] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0085] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for accurately assessing water resources in an inland river basin, characterized in that: The following steps are involved: S1, Multi-source hydrological ecological data collection and feature extraction: Deploy a multimodal sensor network in the inland river basin to collect hydrological characteristic data of the inland river and surrounding wetlands, including inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation. Perform spatiotemporal consistency processing on the collected data to extract implicit water exchange characteristic indicators between inland rivers and wetlands, including wetland groundwater recharge, inland river boundary seepage rate and seasonal water exchange amplitude. S2, Dynamic modeling of implicit water exchange between inland river and wetland: Based on the characteristic indicators of implicit water exchange between inland rivers and wetlands, a dynamic model of implicit water exchange between inland rivers and wetlands was established. This dynamic model includes the infiltration path from inland rivers to wetlands, the impact of wetland evapotranspiration on groundwater levels, and the dynamic process of seasonal precipitation recharge. S3, calculation of total water resources in inland river basins: The dynamic model of implicit water exchange between inland rivers and wetlands is embedded in the water cycle system of inland river basins to comprehensively calculate the amount of surface water resources and groundwater resources in the basin. Based on the dynamic model of implicit water exchange between inland rivers and wetlands, the deviation of traditional water resources calculation is corrected to obtain the accurate total amount of water resources in the basin.

2. According to claim 1, a method for accurately assessing water resources in an inland river basin is characterized in that: The multimodal sensor network in S1 specifically includes: Inland river water level change monitoring: water level sensors are deployed in various river sections of inland river basins, distributed in river bends, tributary confluences and recharge areas, to collect inland river water level change data in real time; Wetland soil moisture monitoring: A grid layout is adopted in the wetland area, and soil moisture sensors are installed. They are buried in multiple layers of soil depth, covering typical vegetation areas and exposed areas of the wetland, and collecting wetland soil moisture change data; Groundwater level monitoring: Groundwater level sensors are deployed around wetlands and in the hidden water exchange areas between inland rivers and wetlands to monitor the dynamic changes of groundwater levels; Evapotranspiration rate monitoring: eddy covariance systems or lysimeters are deployed at the boundary areas between inland rivers and wetlands and in the core areas of wetlands to monitor the evapotranspiration rate per unit area in real time; Precipitation monitoring: Obtain precipitation in inland river basins and wetland areas based on data from the meteorological center.

3. According to claim 2, a method for accurately assessing water resources in an inland river basin is characterized in that: The characteristic indexes of implicit water exchange between inland river and wetland extracted in S1 specifically include: S11, spatial registration and consistency processing: Based on the geographic information system of the inland river basin, a unified spatial reference framework covering the inland river and wetland areas is established, and the collected data on inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation are mapped according to geographic coordinates. The data of discrete collection points are processed into spatial continuity using spatial interpolation algorithms to fill in the missing values ​​in uncovered areas; S12, calculation of implicit water exchange characteristic index: S121, wetland groundwater recharge: by analyzing the time series changes of wetland soil moisture content and combining the groundwater level fluctuation data, the vertical groundwater recharge per unit area of ​​wetland is calculated using the water balance method; S122, Inland river boundary seepage rate: Based on the water level gradient between the inland river water level and the wetland groundwater level, combined with the soil permeability coefficient of the river boundary, the horizontal seepage rate of the inland river boundary is calculated using the two-dimensional groundwater flow model; S123, seasonal water exchange amplitude: by analyzing the seasonal change trend of inland river water level and wetland soil moisture content, calculate the difference in water exchange between inland rivers and wetlands during the flood season and the dry season, and quantify the seasonal water exchange amplitude.

4. According to claim 3, a method for accurately assessing water resources in an inland river basin is characterized in that: The calculation of the wetland groundwater recharge adopts the water balance method to calculate the vertical recharge of the wetland groundwater per unit time: Q w =A s (PER), where Q w is the groundwater recharge to the wetland, A s is the wetland area, P is the precipitation per unit time, E is the evapotranspiration rate per unit time, and R is the surface runoff per unit time; The calculation of the inland river boundary seepage rate is based on the gradient between the river water level and the wetland groundwater level, and the horizontal seepage rate per unit time is calculated as: Among them, Q b is the inland river boundary seepage rate, K is the soil permeability coefficient, A b is the seepage cross-sectional area at the inland river boundary, ΔH is the difference between the inland river water level and the wetland groundwater level, and L is the horizontal distance between the inland river boundary and the wetland groundwater recharge area, i.e., the seepage path length; The calculation of the seasonal water exchange amplitude is carried out by performing difference calculation on the water exchange data of the flood season and the dry season to determine the seasonal fluctuation amplitude: Q s =|Q wet -Q dry |, where Q s is the seasonal water exchange amplitude, Q wet is the water exchange volume of inland river wetlands during the flood season, Q dry It is the water exchange volume of inland river wetlands during the dry season.

5. According to claim 4, a method for accurately assessing water resources in an inland river basin is characterized in that: In S2, the wetland groundwater recharge Q w , inland river boundary seepage rate Q b and seasonal water exchange amplitude Q s , as input variables for the dynamic model of inland river-wetland implicit water exchange; The inland river-wetland implicit water exchange dynamic model includes an inland river seepage path submodule, a wetland evapotranspiration impact submodule and a seasonal precipitation recharge submodule.

6. According to claim 5, a method for accurately assessing water resources in an inland river basin is characterized in that: The inland river seepage path submodule uses a two-dimensional groundwater flow equation to simulate the path and flow of inland river seepage to wetlands based on the gradient relationship between the inland river water level and the wetland groundwater level, combined with the boundary permeability coefficient K and the seepage path length L: Among them, K x ,K y are the components of the permeability coefficient in the x and y directions, h is the groundwater level, S is the storage coefficient, t is time, x, y are spatial coordinates, and are partial derivative operators, It represents the rate of change of the spatial direction, that is, the response to the change of the lateral position. It represents the rate of change in spatial direction, that is, the response to the change in longitudinal position. represents the water head gradient of the groundwater level in the x direction, represents the head gradient of the groundwater level in the y direction, It indicates the rate of change of groundwater level over time and describes the dynamic changes of groundwater level.

7. The method for accurately assessing water resources in an inland river basin according to claim 6 is characterized in that: The wetland evapotranspiration impact submodule evaluates the dynamic consumption effect of evapotranspiration on the wetland groundwater level, expressed as: Where ΔH is the dynamic change of groundwater level caused by evapotranspiration, E is the evapotranspiration rate of wetlands, and A s is the wetland area, S is the water storage coefficient, Q w is the groundwater recharge of the wetland, and the groundwater level drop caused by evapotranspiration is given by Q w Dynamically correct the recharge amount to ensure the water balance of the wetland.

8. According to claim 7, a method for accurately assessing water resources in an inland river basin is characterized in that: The seasonal precipitation recharge submodule simulates the dynamic recharge process of seasonal precipitation on the wetland groundwater level, expressed as: Q p =P·A r ·η+Q s , where Q p is the corrected seasonal precipitation recharge, P is the precipitation per unit time, A r is the area of ​​precipitation action, η is the soil infiltration rate, Q s is the seasonal water exchange amplitude.

9. The method for accurately assessing water resources in an inland river basin according to claim 8, characterized in that: The calculation of the total amount of water resources in the inland river basin in S3 specifically includes: Remove hidden water exchange Q 隐性 : The amount of hidden water exchange removed is calculated by the following formula: Q 隐性 =Q 流失 +Q ΔH +Q p , where Q 流失 represents the infiltration volume from inland river to wetland, Q p represents the amount of water replenished to the wetland by seasonal precipitation, Q ΔH is the change in groundwater volume caused by wetland evapotranspiration, calculated by ΔH, through the wetland area A wetland The dynamic change of groundwater level ΔH is converted into water volume using the following formula: Q ΔH =ΔH·A wetland ; Calculate the total water resources in the basin: After removing the implicit water exchange, the corrected total water resources in the basin are obtained: W 流域 =W 地表 +W 地下水 -Q 隐性 ; Among them, W 流域 represents the total amount of water resources in inland river basins, W 地表 is the surface water resources, W 地下水 Amount of groundwater resources; Q 流失 =Q b ×Ap, where Q b is the horizontal seepage rate, and Ap is the cross-sectional area of ​​the seepage path.

10. An inland river basin water resources accurate assessment system, used to implement an inland river basin water resources accurate assessment method as claimed in any one of claims 1 to 9, characterized in that: Includes the following modules: The multi-source hydro-ecological data collection and extraction module is used to deploy a multi-modal sensor network in the inland river basin to collect hydrological characteristic data of the inland river and surrounding wetlands, including inland river water level changes, wetland soil moisture content, groundwater level, evapotranspiration rate and precipitation, and perform spatiotemporal consistency processing on the collected data to extract the characteristic indicators of implicit water exchange between inland rivers and wetlands, including wetland groundwater recharge, inland river boundary seepage rate and seasonal water exchange amplitude; The inland river-wetland implicit water exchange dynamic modeling module is based on the implicit water exchange characteristic indicators between inland rivers and wetlands extracted by the multi-source hydrological and ecological data collection and extraction module to establish an inland river-wetland implicit water exchange dynamic model. The inland river-wetland implicit water exchange dynamic model includes the infiltration path from inland rivers to wetlands, the impact of wetland evapotranspiration on groundwater levels, and the dynamic process of seasonal precipitation recharge; The total amount of water resources calculation module embeds the inland river-wetland implicit water exchange dynamic model constructed by the inland river-wetland implicit water exchange dynamic modeling module into the inland river basin water cycle system, and comprehensively calculates the surface water resources and groundwater resources in the basin to obtain the accurate total amount of water resources in the inland river basin.

Images