Method and device for determining water consumption threshold value of arid and semi-arid region based on water balance

Abstract

The invention discloses an arid and semi-arid region water consumption threshold determination method and device based on water balance, and the method comprises the steps: determining the change of land water reserves, and constructing a first function relation between the change of land water reserves and water consumption redundancy; the water consumption redundancy represents the rainfall surplus degree when the water amount balance is maintained; the land water reserve change is the difference between the land water reserve at the ith moment and the land water reserve at the (i-1) th moment; calculating the water consumption redundancy and the evapotranspiration total water consumption threshold value based on the first function relation when the water amount is balanced; establishing a second function relationship between the land water reserve change and the main water consumption redundancy, and calculating a main water consumption threshold value when the water amount is balanced; and establishing a relationship between the main water consumption factor and the main water consumption threshold value to determine the water consumption threshold value of the arid and semi-arid region. The method provided by the invention can provide reliable reference for quantifying the water consumption threshold value of the arid and semi-arid regions, and has important practical significance for reasonable allocation of water resources and promotion of agricultural and ecological sustainable development.

Description

Technical Field

[0001] The present invention relates to the field of ecohydrology, and in particular to a method and a device for determining a water consumption threshold in an arid or semi-arid area based on water balance. Background Art

[0002] Arid and semi-arid regions account for about 40% of the world's land area and are home to more than one-third of the world's population. Arid and semi-arid regions are water-scarce and highly sensitive to climate change and human activities. Precipitation in arid and semi-arid regions is scarce, and total evapotranspiration accounts for more than 90% of precipitation. Agricultural water consumption and ecological water consumption are the two main sources of water resource consumption in arid and semi-arid regions, and are also important factors causing regional water shortages in recent years.

[0003] In the past few decades, with the rapid growth of population and the increasing demand for food production, agricultural water consumption has increased dramatically with the expansion of irrigation area, exacerbating the contradiction between water supply and demand in arid and semi-arid areas. While playing a role in soil and water conservation, desertification control and improving the ecological environment, vegetation also consumes a lot of water resources. Therefore, determining the water consumption threshold in arid and semi-arid areas is of great significance for formulating reasonable and efficient water resources management measures, ensuring food security and promoting ecological sustainable development.

[0004] The water consumption threshold can reflect the appropriate consumption of water resources in the basin to meet the sustainable use of agriculture and ecology. Once the threshold is exceeded, there will be problems such as groundwater level decline, river flow interruption, and destruction of ecosystem functions. At present, there is still a lack of effective indicators to characterize the water consumption threshold in arid and semi-arid areas. Usually, the stability of runoff is used to reflect the water consumption threshold in humid or semi-humid areas. However, the runoff volume in arid and semi-arid areas is small, and the runoff coefficient is difficult to accurately reflect the water consumption threshold.

[0005] In addition, the water balance principle has been mostly used in the fields of water resources management and planning, watershed hydrological models and hydrological cycles, drought monitoring and assessment, and is rarely used to determine the water consumption threshold in arid and semi-arid areas. Therefore, based on water balance, it is of great practical significance to propose indicators that can effectively reflect water consumption in arid and semi-arid areas and quantify the water consumption threshold for efficient use and rational allocation of water resources. Summary of the invention

[0006] The present invention provides a method and device for determining a water consumption threshold in an arid or semi-arid area based on water balance, which are used to solve the problem in the prior art of lacking effective indicators to characterize the water consumption threshold in an arid or semi-arid area.

[0007] A method for determining a water consumption threshold in an arid or semi-arid area based on water balance in the present invention is characterized in that the method comprises:

[0008] Determine the change in terrestrial water reserves, and construct a first functional relationship between the change in terrestrial water reserves and water consumption redundancy; the water consumption redundancy represents the degree of precipitation surplus when maintaining water balance; the change in terrestrial water reserves is the difference between the terrestrial water reserves at the i-th moment and the terrestrial water reserves at the i-1-th moment;

[0009] Calculate the water consumption redundancy and the total water consumption threshold of evapotranspiration during water balance based on the first functional relationship;

[0010] Establishing a second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculating the main water consumption threshold when the water volume is balanced;

[0011] The relationship between the main water consumption factors and the main water consumption thresholds is established to determine the water consumption thresholds in arid and semi-arid areas.

[0012] Optionally, the method further includes:

[0013] According to the main water consumption categories, the research area is divided into areas dominated by agricultural water consumption, areas dominated by ecological water consumption, and areas dominated by both agricultural and ecological water consumption;

[0014] Based on the relationship between the main water consumption factors and the main water consumption threshold, the scope of the agricultural water consumption dominant area, the ecological water consumption dominant area, and the agricultural water consumption and ecological water consumption jointly dominant area are respectively determined.

[0015] Optionally, the method further includes: obtaining precipitation, evapotranspiration, terrestrial water storage, agricultural water consumption and ecological water consumption in arid and semi-arid areas based on existing data; the existing data at least includes: remote sensing data and model data.

[0016] Optionally, the method also includes: the main water consumption in the area dominated by agricultural water consumption is agricultural water consumption, the main water consumption in the area dominated by ecological water consumption is ecological water consumption, and the main water consumption in the area dominated by agricultural water consumption and ecological water consumption is the sum of agricultural water consumption and ecological water consumption.

[0017] Optionally, constructing a first functional relationship between the change in terrestrial water storage and water consumption redundancy includes:

[0018] The relationship between the precipitation, evapotranspiration and runoff and the change in terrestrial water storage is established according to the following formula:

[0019] P-ET-R=TWSC

[0020] After deformation, we get:

[0021]

[0022] The water consumption redundancy PSC is:

[0023]

[0024] Taking the change of terrestrial water storage as the dependent variable and water consumption redundancy as the independent variable, the first functional relationship is constructed:

[0025] TWSC=F(PSC)

[0026] Where TWSC is the change in terrestrial water storage, P is precipitation, ET is evapotranspiration, and R is runoff.

[0027] Optionally, the water consumption redundancy and the total water consumption threshold of evapotranspiration when calculating the water balance based on the first functional relationship include:

[0028] The water consumption redundancy during water balance is calculated according to the following formula:

[0029] TWSC=F(PSC0)=0

[0030] The total water consumption threshold of evapotranspiration in water balance is calculated according to the following formula:

[0031] TWC=ET=P(1-PSC0)

[0032] Among them, PSC0 is the water consumption redundancy when the water balance is reached, 1-PSC0 is the ratio of total evapotranspiration water consumption to precipitation when maintaining water balance, and TWC is the total evapotranspiration water consumption threshold when the water balance is reached.

[0033] Optionally, establishing a second functional relationship between the change in terrestrial water reserves and the main water consumption redundancy, and calculating the main water consumption threshold during water balance includes:

[0034] Select multiple factors that affect the water consumption threshold and rank them;

[0035] Determine the main water consumption redundancy according to the following formula:

[0036]

[0037] Among them, PSC major is the main water consumption redundancy, and MWC is the main water consumption threshold at water balance;

[0038] The second functional relationship between the change of terrestrial water storage and the redundancy of main water consumption is established, and the main water consumption threshold in water balance is calculated according to the following formula:

[0039] MWC=P(1-PSC major0 )

[0040] Among them, PSC major0 It is the main water consumption redundancy in water balance, 1-PSC major0 It is the proportion of precipitation that is the main water consumption when maintaining water balance.

[0041] Optionally, at least one of the following methods is used to rank multiple factors affecting the water consumption threshold: machine learning method, multiple linear regression or structural equation model.

[0042] The present invention provides a device for determining a water consumption threshold in an arid or semi-arid area based on water balance, the device comprising:

[0043] A first determination unit is used to determine the change in terrestrial water reserves and construct a first functional relationship between the change in terrestrial water reserves and water consumption redundancy; the water consumption redundancy represents the degree of precipitation surplus when maintaining water balance; the change in terrestrial water reserves is the difference between the terrestrial water reserves at the i-th moment and the terrestrial water reserves at the i-1-th moment;

[0044] A second determination unit, configured to calculate the water consumption redundancy and the total water consumption threshold of evapotranspiration during water balance based on the first functional relationship;

[0045] A third determination unit is used to establish a second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculate the main water consumption threshold when the water balance is reached;

[0046] The fourth determination unit is used to establish a relationship between the main water consumption factor and the main water consumption threshold to determine the water consumption threshold in the arid and semi-arid areas.

[0047] The present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement any of the methods described above.

[0048] The present invention is based on water balance and defines water consumption redundancy. By constructing a functional relationship between terrestrial water storage changes and water consumption redundancy, the total water consumption threshold of evapotranspiration is quantified, providing a reliable reference for quantifying the water consumption threshold in arid and semi-arid areas. It has important practical significance for the rational allocation of water resources and promoting sustainable development of agriculture and ecology. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of a method for determining a water consumption threshold in an arid or semi-arid area based on water balance in an embodiment of the present invention;

[0050] Figure 2 This is a structural diagram of a device for determining a water consumption threshold in arid and semi-arid areas based on water balance in an embodiment of the present invention;

[0051] Figures 3A-3I It is a scatter plot between PSC and TWSC of three types of regions in the embodiment of the present invention;

[0052] Figure 4The spatial distribution of PSC0 in the Xiliaohe Plain in the embodiment of the present invention;

[0053] Figure 5 The importance ranking of factors affecting the water consumption threshold in the embodiment of the present invention;

[0054] Figures 6A-6I It is a scatter plot between PSCmajor0 and TWSC of three types of regions in the embodiment of the present invention;

[0055] Figure 7 The spatial distribution of PSC major0 in the Xiliaohe Plain in the embodiment of the present invention;

[0056] Figures 8A-8C It is a scatter plot between PSCmajor0 and elevation of three types of regions in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0058] A specific embodiment of the present invention provides a method for determining a water consumption threshold in an arid and semi-arid area based on water balance, as follows: Figure 1 As shown, the method includes:

[0059] Step 100, determine the change in terrestrial water reserves, and construct a first functional relationship between the change in terrestrial water reserves and water consumption redundancy; the water consumption redundancy represents the degree of precipitation surplus when maintaining water balance; the change in terrestrial water reserves is the difference between the terrestrial water reserves at the i-th moment and the terrestrial water reserves at the i-1-th moment. Specifically, the water consumption redundancy is proposed based on the principle of water balance, and the change in terrestrial water reserves can be calculated according to the formula TWSC=TWS i -TWS i-1 Get, where TWSC is the terrestrial water storage change, TWS i is the terrestrial water storage at the i-th moment, TWS i-1 is the land water storage at the i-1th moment.

[0060] Step 200: Calculate the water consumption redundancy and evapotranspiration total water consumption threshold when the water volume is balanced based on the first functional relationship. Specifically, the water consumption redundancy and evapotranspiration total water consumption threshold when the water volume is balanced are the water consumption redundancy and evapotranspiration total water consumption threshold when the water volume reaches balance.

[0061] Step 300: establish a second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculate the main water consumption threshold when the water volume is balanced.

[0062] Step 400: Establish a relationship between the main water consumption factor and the main water consumption threshold to determine the water consumption threshold in arid and semi-arid areas.

[0063] The embodiment of the present invention is based on water balance and defines water consumption redundancy. By constructing a functional relationship between terrestrial water storage changes and water consumption redundancy, the total water consumption threshold of evapotranspiration is quantified, providing a reliable reference for quantifying the water consumption threshold in arid and semi-arid areas. It has important practical significance for the rational allocation of water resources and promoting sustainable development of agriculture and ecology.

[0064] The method for determining water consumption threshold in arid and semi-arid areas based on water balance described in the embodiment of the present invention preferably further comprises:

[0065] According to the main water consumption categories, the research area is divided into areas dominated by agricultural water consumption, areas dominated by ecological water consumption, and areas dominated by both agricultural and ecological water consumption;

[0066] Based on the relationship between the main water consumption factors and the main water consumption threshold, the scope of the agricultural water consumption dominant area, the ecological water consumption dominant area, and the agricultural water consumption and ecological water consumption jointly dominant area are respectively determined.

[0067] Specifically, the research area is divided into areas dominated by agricultural water consumption (AR), areas dominated by ecological water consumption (ER), and areas dominated by both agricultural and ecological water consumption (AER). For the three types of areas, the main water consumption thresholds are:

[0068]

[0069] Among them, MWC is the main water consumption threshold, AWC is agricultural water consumption, and EWC is ecological water consumption.

[0070] The method for determining the water consumption threshold of arid and semi-arid areas based on water balance in the embodiment of the present invention preferably further comprises: obtaining precipitation, evapotranspiration, terrestrial water storage, agricultural water consumption and ecological water consumption in the arid and semi-arid areas based on existing data; the existing data at least includes: remote sensing data and model data. In a specific embodiment of the present invention, based on remote sensing data, model data, etc., information such as precipitation, evapotranspiration, terrestrial water storage, agricultural water consumption and ecological water consumption in the arid and semi-arid areas within a certain time range is obtained.

[0071] The method for determining water consumption thresholds in arid and semi-arid areas based on water balance described in an embodiment of the present invention preferably further comprises: the main water consumption in the area dominated by agricultural water consumption is agricultural water consumption, the main water consumption in the area dominated by ecological water consumption is ecological water consumption, and the main water consumption in the area dominated by agricultural water consumption and ecological water consumption is the sum of agricultural water consumption and ecological water consumption.

[0072] The method for determining water consumption thresholds in arid and semi-arid areas based on water balance described in the embodiment of the present invention preferably constructs a first functional relationship between terrestrial water storage changes and water consumption redundancy, including:

[0073] The relationship between the precipitation, evapotranspiration and runoff and the change in terrestrial water storage is established according to the following formula:

[0074] P-ET-R=TWSC

[0075] After deformation, we get:

[0076]

[0077] The water consumption redundancy PSC is:

[0078]

[0079] Taking the change of terrestrial water storage as the dependent variable and water consumption redundancy as the independent variable, the first functional relationship is constructed:

[0080] TWSC=F(PSC)

[0081] Where TWSC is the change in terrestrial water storage, P is precipitation, ET is evapotranspiration, and R is runoff.

[0082] The method for determining water consumption thresholds in arid and semi-arid areas based on water balance described in the embodiment of the present invention preferably includes: calculating the water consumption redundancy and the total water consumption threshold of evapotranspiration when calculating water balance based on the first functional relationship.

[0083] The water consumption redundancy during water balance is calculated according to the following formula:

[0084] TWSC=F(PSC0)=0

[0085] The total water consumption threshold of evapotranspiration in water balance is calculated according to the following formula:

[0086] TWC=ET=P(1-PSC0)

[0087] Among them, PSC0 is the water consumption redundancy when the water balance is reached, 1-PSC0 is the ratio of total evapotranspiration water consumption to precipitation when maintaining water balance, and TWC is the total evapotranspiration water consumption threshold when the water balance is reached.

[0088] The method for determining the water consumption threshold in arid and semi-arid areas based on water balance described in the embodiment of the present invention preferably establishes a second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculates the main water consumption threshold when the water balance is applied, including:

[0089] Select multiple factors that affect the water consumption threshold and rank them.

[0090] Determine the main water consumption redundancy according to the following formula:

[0091]

[0092] Among them, PSC major is the main water consumption redundancy, MWC is the main water consumption threshold;

[0093] The second functional relationship between the change of terrestrial water storage and the redundancy of main water consumption is established, and the main water consumption threshold in water balance is calculated according to the following formula:

[0094] MWC=P(1-PSC major0 )

[0095] Among them, PSC major0 It is the main water consumption redundancy in water balance, 1-PSC major0 It is the ratio of main water consumption to precipitation when maintaining water balance. Specifically, in this method, the main water consumption thresholds of the three types of regions when maintaining water balance are calculated respectively.

[0096] The method for determining water consumption thresholds in arid and semi-arid areas based on water balance described in the embodiment of the present invention preferably uses at least one of the following methods to rank multiple factors affecting the water consumption thresholds: machine learning method, multivariate linear regression or structural equation model.

[0097] The present invention also provides a device for determining water consumption threshold in arid and semi-arid areas based on water balance, such as Figure 2 As shown, the device comprises:

[0098] The first determination unit 201 is used to determine the change in land water reserves and construct a first functional relationship between the change in land water reserves and water consumption redundancy; the water consumption redundancy represents the degree of precipitation surplus when maintaining water balance; the change in land water reserves is the difference between the land water reserves at the i-th moment and the land water reserves at the i-1-th moment;

[0099] A second determining unit 202 is used to calculate the water consumption redundancy and the total water consumption threshold of evapotranspiration during water balance based on the first functional relationship;

[0100] The third determination unit 203 is used to establish a second functional relationship between the change in the land water storage and the main water consumption redundancy, and calculate the main water consumption threshold when the water volume is balanced;

[0101] The fourth determining unit 204 is used to establish a relationship between the main water consumption factor and the main water consumption threshold to determine the water consumption threshold for arid and semi-arid areas.

[0102] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement any of the methods described above.

[0103] The process and results of the present invention are described below by specific examples. In this example, the Xiliaohe Plain is used as the research area. The Xiliaohe Plain is located in the agricultural and pastoral transition zone of Northeast China. It is short of water resources and belongs to a typical arid and semi-arid area. The calculation of water consumption threshold in the Xiliaohe Plain has good representativeness and practical significance.

[0104] Based on remote sensing data such as the Qinghai-Tibet Plateau Data Center, GLEAM (Global Land Evaporation Amsterdam Model) data, GRACE (Gravity Recovery and Climate Experiment) data, and land use, the precipitation, evapotranspiration, terrestrial water storage, agricultural water consumption and ecological water consumption in the Xiliaohe Plain from 1980 to 2020 were extracted and uniformly processed to a resolution of 0.25°.

[0105] The water consumption redundancy PSC is determined based on precipitation and evapotranspiration, and the terrestrial water storage change TWSC is calculated based on the difference between the terrestrial water storage at the i-th moment and the terrestrial water storage at the i-1th moment. According to the proportion of agricultural water consumption and ecological water consumption in the total water consumption, the Xiliaohe Plain is divided into three types of areas: agricultural water consumption-dominated areas AR, ecological water consumption-dominated areas ER, and agricultural water consumption and ecological water consumption-dominated areas AER. For the three types of areas, the main water consumption thresholds are:

[0106]

[0107] Among them, MWC is the main water consumption threshold, AWC is agricultural water consumption, and EWC is ecological water consumption.

[0108] The change of terrestrial water storage was calculated, and the water consumption redundancy was proposed based on the water balance principle. The relationship between PSC and TWSC was fitted based on the 0.25° pixel:

[0109] TWSC=TWS i -TWS i-1 Formula 2:

[0110] P-ET-R=TWSC Formula 3;

[0111]

[0112] Where TWSC is the change in terrestrial water storage, TWS i is the terrestrial water storage at the i-th moment, TWS i-1is the land water storage at the i-1th moment, P is precipitation, ET is evapotranspiration, and R is runoff.

[0113] Water consumption redundancy is used to indicate the degree of precipitation surplus when maintaining water balance. The water consumption redundancy PSC is defined as:

[0114]

[0115] TWSC=F(PSC) Formula 6;

[0116] The results showed that there was a significant (p < 0.01) linear correlation between PSC and TWSC for the three types of regions. Figures 3A-3I shown.

[0117] Thresholds for water consumption redundancy and total water consumption (TWC) when calculating water balance;

[0118] TWSC=F(PSC0)=0 Formula 7;

[0119] TWC=ET=P(1-PSC0) Formula 8;

[0120] PSC0 is used to represent the water consumption redundancy when TWSC=0, that is, the degree of precipitation surplus when maintaining water balance. When water balance is reached, PSC0 in the Xiliaohe Plain is as follows: Figure 4 shown.

[0121] The PSC0 in the Xiliaohe Plain is between 7% and 24%, which indicates that when the land water balance is reached, the total water consumption accounts for 76% to 93% of the precipitation. There is obvious spatial heterogeneity in the distribution of PSC0, and the PSC0 value in the AR region is the smallest. This shows that among the three types of regions, the total evapotranspiration water consumption in AR accounts for the largest proportion of precipitation, and less spare precipitation is required to maintain the land water balance in AR. The PSC0 of ER is the largest, indicating that the total evapotranspiration water consumption accounts for a relatively small proportion of precipitation. The PSC0 of AER is between AR and ER.

[0122] An interpretable machine learning method (SHAP) was used to identify and rank the dominant factors affecting the water consumption threshold in the Xiliaohe Plain. Five representative factors, namely precipitation, elevation (EL), evapotranspiration, potential evapotranspiration (PET) and proportion of cultivated land (PCL), were selected to explore the impact of their changes on PSC0. Among them, precipitation and evapotranspiration can reflect the water balance, elevation reflects the redistribution and storage of water in different regions, potential evapotranspiration reflects the meteorological and underlying surface conditions, and the proportion of cultivated land reflects the strength of human activities.

[0123] like Figure 5As shown in the figure, the ranking results based on SHAP values ​​are: elevation > precipitation > evapotranspiration > proportion of cultivated land area > potential evapotranspiration, and elevation is the most important factor affecting the water consumption threshold.

[0124] The main water consumption redundancy is defined as:

[0125]

[0126] Among them, PSC major It is the main water consumption redundancy.

[0127] Similar to Formula 6 and Formula 7, establish PSC major The relationship between the change in terrestrial water storage and the threshold of major water consumption in water balance is calculated:

[0128] MWC=P(1-PSC major0 )Formula 10;

[0129] Among them, PSC major0 It is the main water consumption redundancy in water balance, 1-PSC major0 It is the proportion of precipitation that is the main water consumption when maintaining water balance.

[0130] The results show that for the three types of regions, PSC major There was a significant (p<0.01) linear correlation between TWSC. Figures 6A-6I When water is balanced, the PSC in the Xiliaohe Plain is major0 like Figure 7 PSC in the Xiliaohe Plain major0 Between 15% and 53%, which indicates that when the land water balance is in balance, the total water consumption accounts for 47% to 85% of the precipitation.

[0131] Establishing PSC major0 The relationship between water level and elevation is further clarified to further clarify the control scope of the main water consumption thresholds in the three types of areas. Figures 8A-8C As shown, for the three types of regions, PSC major0 There is a significant (p<0.01) linear positive correlation with the elevation. The higher the elevation, the greater the water redundancy required to maintain the balance of terrestrial water in the Xiliaohe Plain, and more spare water is needed to maintain the balance of terrestrial water reserves.

[0132] For areas dominated by agricultural water consumption, PSC major0 Between 37% and 53%, agricultural water consumption should be controlled at 47% to 63% of total precipitation. For areas dominated by ecological water consumption, PSC major0 Between 37% and 50%, ecological water consumption should be controlled at 50% to 63% of total precipitation. For areas where agricultural water consumption and ecological water consumption are dominant, PSCmajor0 The total amount of agricultural water consumption and ecological water consumption should be controlled at 62% to 80% of the total precipitation. The results of the three types of regions all show that the higher the altitude, the weaker the water storage capacity of the region. major0 The larger it is, the smaller the proportion of main water consumption to precipitation should be controlled.

[0133] This embodiment obtains information on precipitation, evapotranspiration, terrestrial water storage, agricultural water consumption and ecological water consumption from 1980 to 2020 based on remote sensing data. The study area is divided into three types of regions. Based on the principle of water balance, water consumption redundancy is proposed, and water consumption redundancy is used to indicate the degree of precipitation surplus when maintaining water balance. By constructing a functional relationship between terrestrial water storage changes and water consumption redundancy, the water consumption redundancy and total water consumption threshold when water balance is achieved. Finally, the main factors affecting the water consumption threshold are selected and ranked, and the main water consumption thresholds of the three types of regions when water balance is achieved are clarified. The calculated water consumption threshold in the Xiliaohe Plain has a high practical value.

[0134] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0135] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0136] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0137] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0139] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for determining water consumption threshold in arid and semi-arid areas based on water balance, characterized in that: The method comprises: Determine the change in terrestrial water reserves, and construct a first functional relationship between the change in terrestrial water reserves and water consumption redundancy; the water consumption redundancy represents the degree of precipitation surplus when maintaining water balance; the change in terrestrial water reserves is the difference between the terrestrial water reserves at the i-th moment and the terrestrial water reserves at the i-1-th moment; Calculate the water consumption redundancy and the total water consumption threshold of evapotranspiration during water balance based on the first functional relationship; Establishing a second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculating the main water consumption threshold when the water volume is balanced; The relationship between the main water consumption factors and the main water consumption thresholds is established to determine the water consumption thresholds in arid and semi-arid areas.

2. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 1, characterized in that: The method further comprises: According to the main water consumption categories, the research area is divided into areas dominated by agricultural water consumption, areas dominated by ecological water consumption, and areas dominated by both agricultural and ecological water consumption; Based on the relationship between the main water consumption factors and the main water consumption threshold, the scope of the agricultural water consumption dominant area, the ecological water consumption dominant area, and the agricultural water consumption and ecological water consumption jointly dominant area are respectively determined.

3. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 2, characterized in that: The method further comprises: obtaining precipitation, evapotranspiration, terrestrial water storage, agricultural water consumption and ecological water consumption in arid and semi-arid areas based on existing data; the existing data at least comprises: remote sensing data and model data.

4. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 3, characterized in that: The method also includes: the main water consumption in the area dominated by agricultural water consumption is agricultural water consumption, the main water consumption in the area dominated by ecological water consumption is ecological water consumption, and the main water consumption in the area dominated by agricultural water consumption and ecological water consumption is the sum of agricultural water consumption and ecological water consumption.

5. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 3, characterized in that: The first functional relationship between the change of terrestrial water storage and water consumption redundancy is constructed as follows: The relationship between the precipitation, evapotranspiration and runoff and the change in terrestrial water storage is established according to the following formula: P-ET-R=TWSC After deformation, we get: The water consumption redundancy PSC is: Taking the change of terrestrial water storage as the dependent variable and water consumption redundancy as the independent variable, the first functional relationship is constructed: TWSC=F(PSC) Where TWSC is the change in terrestrial water storage, P is precipitation, ET is evapotranspiration, and R is runoff.

6. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 5, characterized in that: The water consumption redundancy and the total water consumption threshold of evapotranspiration when calculating the water balance based on the first functional relationship include: The water consumption redundancy during water balance is calculated according to the following formula: TWSC=F(PSC0)=0 The total water consumption threshold of evapotranspiration in water balance is calculated according to the following formula: TWC=ET=P(1-PSC0) Among them, PSC0 is the water consumption redundancy when the water balance is reached, 1-PSC0 is the ratio of total evapotranspiration water consumption to precipitation when maintaining water balance, and TWC is the total evapotranspiration water consumption threshold when the water balance is reached.

7. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 5, characterized in that: Establishing the second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculating the main water consumption threshold when the water balance is in progress includes: Select multiple factors that affect the water consumption threshold and rank them; Determine the main water consumption redundancy according to the following formula: Among them, PSC major is the main water consumption redundancy, and MWC is the main water consumption threshold at water balance; The second functional relationship between the change of terrestrial water storage and the redundancy of main water consumption is established, and the main water consumption threshold in water balance is calculated according to the following formula: MWC=P(1-PSC major0 ) Among them, PSC major0 It is the main water consumption redundancy in water balance, 1-PSC major0 It is the proportion of precipitation that is the main water consumption when maintaining water balance.

8. The method for determining water consumption threshold in arid and semi-arid areas based on water balance according to claim 7, characterized in that: At least one of the following methods was used to rank multiple factors affecting water consumption thresholds: machine learning methods, multiple linear regression, or structural equation modeling.

9. A device for determining water consumption threshold in arid and semi-arid areas based on water balance, characterized in that: The device comprises: A first determination unit is used to determine the change in terrestrial water reserves and construct a first functional relationship between the change in terrestrial water reserves and water consumption redundancy; the water consumption redundancy represents the degree of precipitation surplus when maintaining water balance; the change in terrestrial water reserves is the difference between the terrestrial water reserves at the i-th moment and the terrestrial water reserves at the i-1-th moment; A second determination unit, configured to calculate the water consumption redundancy and the total water consumption threshold of evapotranspiration during water balance based on the first functional relationship; A third determination unit is used to establish a second functional relationship between the change in terrestrial water storage and the main water consumption redundancy, and calculate the main water consumption threshold when the water balance is reached; The fourth determination unit is used to establish a relationship between the main water consumption factor and the main water consumption threshold to determine the water consumption threshold in the arid and semi-arid areas.

10. A computer-readable storage medium storing one or more programs, wherein the one or more programs can be executed by one or more processors to implement the method according to any one of claims 1 to 8.

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