Regional water balance health evaluation method and device based on binary water circulation

Abstract

The invention discloses a regional water balance health evaluation method and device based on binary water circulation. The method comprises the following steps: acquiring a natural water circulation key element data set, a social water intake key flux data set and a key evaluation index data set of each subsystem in a historical period in a target area; then carrying out pretreatment; constructing a natural water circulation health evaluation model, and inputting natural water circulation key elements to obtain a first evaluation value; constructing a social water circulation health evaluation model, and inputting social water circulation key elements to obtain a second evaluation value; constructing a cooperation system coordination degree evaluation model, and inputting key evaluation indexes of a social economic system, an ecological environment system and a water resource system to obtain a third evaluation value; and constructing a comprehensive water balance health evaluation model, inputting the obtained first evaluation value, the second evaluation value and the third evaluation value into the comprehensive water balance health evaluation model to obtain a comprehensive evaluation value, and performing evaluation analysis on the regional comprehensive water balance health state through the comprehensive evaluation value.

Description

Technical Field

[0001] The present invention belongs to the technical field of water cycle systems and water resource management, and particularly relates to a method and device for evaluating the health of regional water balance based on the dual water cycle. Background Technique

[0002] The key elements of water resources, together with each sphere and each water carrier, form a natural - social dual water cycle system under the coupled influence of natural and human activities. Problems such as sudden changes in regional hydrological elements, instability of state fluxes, and imbalance between water supply and demand in the region have caused significant changes in the regional water cycle process, and the metabolism of the water cycle system has also become abnormal, making it difficult to adapt to the overall development goals of the region and the functional positioning of water resources, and difficult to achieve the coordinated development of the ecological environment and social economy.

[0003] Regional water balance follows certain conditions such as water budget balance, water supply - demand balance, and water use balance to a certain extent, which can reflect a state of the healthy circulation of the water system. Therefore, to understand the evolution process of the water cycle in a changing environment, it is urgent to evaluate the health degree of the regional water balance state.

[0004] At present, there are few means for evaluating the health state of regional water balance, mainly focusing on the quantification of water balance and the analysis of the water cycle process. The single water volume change and simple water cycle process are no longer sufficient to represent the health state evaluation of water balance. Summary of the Invention

[0005] In order to overcome the deficiencies of the existing technology, the present invention provides a method for evaluating the health of regional water balance based on the dual water cycle. The method for evaluating the health of regional water balance evaluates the health state of water balance in three aspects: the evolution of natural water cycle elements on a monthly basis, the balance state of natural - social water cycle, and the coordination degree between systems, and solves the problems that the existing water balance health evaluation system mainly focuses on water resource shortage, water resource carrying capacity, etc., and lacks consideration of water cycle elements, economic and social water fluxes, and system incoordination.

[0006] The second object of the present invention is to provide a device for evaluating the health of regional water balance based on the dual water cycle.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] A method for evaluating the health of regional water balance based on the dual water cycle includes the following steps:

[0009] S1: Obtain a dataset of a historical period within the target region, where the dataset includes a dataset of key elements of the natural water cycle, a dataset of key fluxes of social water intake, and a dataset of key evaluation indicators for each subsystem;

[0010] S2: Preprocess the data information in the obtained dataset;

[0011] S3: Construct a natural water cycle health assessment model, input the key elements of the natural water cycle in the key element dataset of the natural water cycle into the natural water cycle health assessment model, and the natural water cycle health assessment model outputs a first evaluation value for evaluating the health status of the natural water cycle;

[0012] S4: Construct a social water cycle health assessment model, input the key elements of the social water cycle in the key element dataset of the social water cycle into the social water cycle health assessment model, and the social water cycle health assessment model outputs a second evaluation value for evaluating the health status of the social water cycle;

[0013] S5: Construct a cooperation system coordination degree assessment model, input the key evaluation indicators of the social - economic system, ecological environment system, and water resources system in the key evaluation indicator dataset of each subsystem into the cooperation system coordination degree assessment model, and the cooperation system coordination degree assessment model outputs a third evaluation value for evaluating the coordination status among each subsystem;

[0014] S6: Construct a comprehensive water balance health assessment model, input the obtained first evaluation value, second evaluation value, and third evaluation value into the comprehensive water balance health assessment model, and the comprehensive water balance health assessment model outputs a comprehensive evaluation value for evaluating the health status of the regional comprehensive water balance; Evaluate and analyze the health status of the regional comprehensive water balance through the comprehensive evaluation value.

[0015] In a preferred embodiment of the present invention, in step S1, the key elements of the natural water cycle in the key element dataset of the natural water cycle include surface runoff, groundwater runoff, rainfall, actual evapotranspiration, and soil water content; the key flux data of social water intake in the key flux dataset of social water intake include domestic water consumption, ecological water consumption, industrial water consumption, agricultural water consumption, and water transfer volume; the key index data of each subsystem in the key evaluation indicator dataset of each subsystem include population density, per capita water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, water consumption per mu of cultivated land, total water resources, precipitation, abnormal surface water storage, drought, heavy precipitation, NDVI, elevation.

[0016] In a preferred embodiment of the present invention, in step S2, the preprocessing includes: unifying the format of the data information in the dataset into a TIF raster file, unifying the time resolution of the data information in the dataset into monthly, and unifying the spatial resolution of the data information in the dataset into a resolution of 0.25° under the WGS - 84 coordinate system.

[0017] In a preferred embodiment of the present invention, in step S3, the natural water cycle health evaluation model obtains the first difference between the rainfall and the actual evapotranspiration, surface runoff, groundwater runoff, and change in soil moisture of the grid, as well as the first sum of the surface runoff, groundwater runoff, and soil water content. By calculating the ratio between the first difference and the first sum, the natural water cycle balance index is obtained. NWI As the first evaluation value, and based on the natural water cycle balance index NWI the health status of the natural water cycle is judged:

[0018] When 0 < NWI ≤ 0.15, the health status of the natural water cycle is in a balanced state;

[0019] When 0.15 < NWI ≤ 0.25, the health status of the natural water cycle is in a slightly unbalanced state;

[0020] When 0.25 < NWI ≤ 0.5, the health status of the natural water cycle is in a moderately unbalanced state;

[0021] When 0.5 < NWI the health status of the natural water cycle is in a severely unbalanced state.

[0022] In a preferred embodiment of the present invention, in step S4, the social water cycle health evaluation model obtains the second difference between the second sum of the domestic water consumption, agricultural water consumption, industrial water consumption, ecological water consumption, and water transfer input of all grids and the water transfer output of the grid, to obtain the total social water intake of all grids. By calculating the ratio between the total social water intake of all grids and the available water resources of all grids, the social water cycle balance index is obtained. SWI As the second evaluation value, and based on the social water cycle balance index SWI the health status of the social water cycle is judged:

[0023] When 0 < SWI ≤ 1, the health status of the social water cycle is in a balanced state;

[0024] When 1 < SWI ≤ 1.5, the health status of the social water cycle is in a slightly unbalanced state;

[0025] When 1.5 < SWI ≤ 2, the health status of the social water cycle is in a moderately unbalanced state;

[0026] When 2 < SWI, the health status of the social water cycle is in a severely unbalanced state.

[0027] In a preferred embodiment of the present invention, in step S5, the water resource indicators of the water resource system include total water resources, precipitation, surface water storage anomaly, number of drought days, and number of heavy rainfall days; the social and economic indicators of the social and economic system include population density, per capita water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, and water consumption per mu of cultivated land; the ecological environment indicators of the ecological environment system include ecological environment water consumption, vegetation coverage, and other indicators.

[0028] In a preferred embodiment of the present invention, in step S5, the cooperation system coordination degree evaluation model obtains the coupling degree and coordination degree between the water resource system, the social and economic system, and the ecological environment system, and obtains the product of the coupling degree and the coordination degree to obtain the coupling coordination degree between the water resource system, the social and economic system, and the ecological environment system. Then, the absolute value of the difference between the coupling coordination degree and 1 is obtained as the third evaluation value D. S ; and through the third evaluation value D S ; the cooperation system coordination degree is judged:

[0029] When 0 < D S ≤ 0.5, the cooperation system coordination degree is in a coordinated state;

[0030] When 0.5 < D S ≤ 0.65, the cooperation system coordination degree is in a slightly uncoordinated state;

[0031] When 0.65 < D S ≤ 0.8, the cooperation system coordination degree is in a moderately uncoordinated state;

[0032] When 0.8 < D S ≤ 1, the cooperation system coordination degree is in a severely uncoordinated state.

[0033] In a preferred embodiment of the present invention, in step S5, the steps for obtaining the comprehensive index values in the water resource system, the social and economic system, and the ecological environment system are as follows:

[0034] Step 501: Standardize each index value in the water resource system, the social and economic system, and the ecological environment system;

[0035] Step 502: Calculate the normalized weights of each index value in the water resource system, the social and economic system, and the ecological environment system;

[0036] Step 503: Calculate the information entropy according to the obtained normalized weights;

[0037] Step 504: Calculate the weights according to the obtained information entropy;

[0038] Step 505: Calculate the comprehensive index values in the water resources system, social - economic system, and ecological environment system according to the obtained weights.

[0039] In a preferred embodiment of the present invention, in step S6, by calculating the natural water cycle balance index NWI , social water cycle balance index SWI, and the cube root of the product of the coupling coordination degree D S between each system, the water balance health index WBHI is obtained. By judging the water balance health index WBHI:

[0040] When 0 < WBHI ≤ 0.5, the comprehensive water balance health is in a balanced state;

[0041] When 0.5 < WBHI ≤ 0.65, the comprehensive water balance health is in a mild imbalance state;

[0042] When 0.65 < WBHI ≤ 0.75, the comprehensive water balance health is in a moderate imbalance state;

[0043] When 0.75 < WBHI ≤ 1, the comprehensive water balance health is in a severe imbalance state.

[0044] A regional water balance health assessment device based on the dual water cycle includes a data acquisition unit, a data processing unit, a natural water cycle health assessment unit, a social water cycle health assessment unit, a cooperation system coordination degree assessment unit, and a comprehensive water balance health assessment unit. Among them,

[0045] The data acquisition unit is used to obtain the key element data of the natural water cycle, the key flux data of social water intake, and the key index data of each subsystem within the region;

[0046] The data processing unit is used to pre - process, perform format conversion, and downscale the data in the acquired data set;

[0047] The natural water cycle health assessment unit is used to assess the health status of the natural water cycle according to the key elements of the natural water cycle;

[0048] The social water cycle health assessment unit is used to assess the health status of the social water cycle according to the important fluxes of the social water cycle;

[0049] The cooperation system coordination degree assessment unit is used to assess the coordination degree between each subsystem according to the index values of each subsystem;

[0050] The comprehensive water balance health assessment unit is used to assess the regional comprehensive water balance health status according to the assessment results of the natural water cycle health assessment unit, the social water cycle health assessment unit, and the cooperation system coordination degree assessment unit, and the assessment result is displayed as the regional water cycle health status.

[0051] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0052] 1. The regional water balance health assessment method based on the dual water cycle of the present invention includes a comprehensive assessment of natural factors and human activity elements that affect the evolution direction of the regional water balance state; on the basis of the traditional water cycle, it evaluates the water regulation functions of each layer of the water cycle system, the natural and social water flux transfer process, and the three physical mechanisms of water drive and movement path, so as to construct a complete regional water balance health assessment method based on the dual water cycle.

[0053] 2. The regional water balance health assessment method based on the dual water cycle of the present invention introduces the basic connotations of the dual water cycle and water balance health, comprehensively evaluates the stability and coordination among the natural water cycle, the social water cycle and each subsystem of the water cycle, constructs a water balance health assessment system, and inventively formulates the assessment criteria and macroscopic implementation paths for healthy water balance from the theoretical and technical levels, effectively quantifies the regional water balance state, and finally realizes the assessment of the regional water balance health degree; therefore, the regional water balance health assessment method based on the dual water cycle of the present invention provides a complete theoretical system and assessment method for the realization of regional national land space development planning and water resource carrying capacity reduction control. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram for constructing the system of the regional water balance health assessment method based on the dual water cycle of the present invention.

[0055] Figure 2 It is a schematic flow diagram of the regional water balance health assessment method based on the dual water cycle of the present invention.

[0056] Figure 3 It is a structural block diagram of the regional water balance health assessment device based on the dual water cycle of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] The present invention will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0058] Embodiment 1

[0059] When evaluating the water balance health degree, first define the healthy water balance:

[0060] In the present invention, the water balance refers to the product evolved from the water cycle process under the land-air coupling effect. Both natural factors and human activities affect the regional water balance; the healthy water balance is an integrated concept that is based on the concept of the community with a shared future for mankind of mountains, waters, forests, fields, lakes, grasslands and deserts and the concept of harmony between humans and water, and integrates social and economic development and ecosystem stability. The regional healthy water balance can be considered from the following aspects: First, in terms of the natural water cycle, it is necessary to ensure the smoothness and continuity of the key elements in the natural water cycle; various waters in the atmosphere, surface, soil vadose zone and underground aquifer such as precipitation, evapotranspiration, runoff, and soil water reflect the states of climate, hydrology and ecology. Second, in terms of the social water cycle, it is necessary to ensure an appropriate balance between the available water resources and the key fluxes of the social water cycle. The social water cycle mainly composed of "taking - using - consuming - discharging" derived from human activities reflects the balance state inside and outside the river channel. Finally, in terms of the economic - environment - water resources coupling system, it is necessary to coordinate the coordinated development degree among the water resources, social economy and ecological environment systems; water resources are the key control elements of social and economic activities and ecological environment. A healthy water balance state is conducive to maintaining an ecological pattern adapted to ecological functions and the efficient utilization of water resources adapted to regional development.

[0061] Generally speaking, the connotation of regional water balance health is to promote the benign succession of the water cycle system on the basis of following the law of conservation of matter and energy and the evolution laws of multiple systems, so as to avoid the interference of human activities on the natural water cycle process, thereby maintaining the sustainable and stable development of the water cycle system, regional economy, society and ecological environment; with the rapid development of multi-source monitoring technologies such as "space - sky - ground - human" and the increasing availability of various data, the ability to obtain water resources - ecology - economy data is constantly improving. The flux of water cycle elements in each sphere and the data distribution information among various systems lay a good data foundation for judging the health state of the regional water balance. Therefore, the health state of the regional water balance can be comprehensively evaluated according to ecological environment data, hydrological water resources data and social economy data.

[0062] See Figure 1 and Figure 2 , the regional water balance health assessment method based on the dual water cycle of the present invention includes the following steps:

[0063] S1: Obtain the data set of the historical period within the target area, and the data set includes the data set of key elements of the natural water cycle, the data set of key fluxes of social water intake, and the data set of key evaluation indexes of each subsystem; where

[0064] The key elements of the natural water cycle in the key element dataset of the natural water cycle include surface runoff, groundwater runoff, rainfall, actual evapotranspiration, and soil water content. These key elements of the natural water cycle can be obtained from GLDAS-CLSM (Global Land Data Assimilation System) and GLEAM (Global Land Evaporation Amsterdam) in the NASA Global Land Data Assimilation System. The former uses advanced surface modeling and data assimilation techniques to ingest satellite- and ground-based observation data products; the latter maximally restores evaporation information contained in satellite observations of current climate and environmental variables. Both of the above datasets can generate optimal fields of monthly land surface states and fluxes at a resolution of 0.25°, which contain the key elements of the natural water cycle;

[0065] The key flux data of social water intake in the key flux dataset of social water intake include domestic water consumption, ecological water consumption, industrial water consumption, agricultural water consumption, and water transfer volume. Among them, the annual total data of each province for domestic water consumption, ecological water consumption, industrial water consumption, and agricultural water consumption can be found in the China Water Resources Bulletin respectively; the water transfer volume data can be obtained by collecting cross-basin water transfer and annual water transfer data across the country;

[0066] The key index data of each subsystem in the key evaluation index dataset of each subsystem include population density, per capita water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, water consumption per mu of cultivated land, total water resources, precipitation, surface water storage anomaly, drought, heavy precipitation, NDVI, elevation. The above data can be found according to the Water Resources Bulletin and Statistical Yearbook. Among them, the surface water storage data can use the CSR_GRACE_GRACE-FO_RL06 gravity field model data of the second edition newly published by the University of Texas Space Research Institute in the United States; drought and heavy precipitation can be obtained through P-III curve frequency analysis based on monthly precipitation data; NDVI data can use the sixth edition of the MODIS vegetation index data, and the digital elevation data can choose to use SRTM C-band data or ASTER GDEM data.

[0067] S2: Preprocess the data information in the obtained dataset; the preprocessing includes the following processes: unify the format of the data information in the dataset into TIF raster files, unify the time resolution of the data information in the dataset into monthly, and unify the spatial resolution of the data information in the dataset into 0.25° resolution in the WGS-84 coordinate system.

[0068] After preprocessing all the data, the present invention distributes it into a template with a resolution of 0.25° in the WGS1984 geographic coordinate system to ensure the accuracy of the calculation. Specifically:

[0069] S210: Resample the data of the key elements of the natural water cycle to unify the grid resolution;

[0070] S220: The annual data of the key fluxes of the social water cycle are obtained from the China Water Resources Bulletin. The water withdrawals of the four sectors of provincial domestic, agricultural, industrial, and ecological environment are obtained and decomposed into corresponding time series according to the total amount of relevant data sets. Among them,

[0071] For agricultural water use data, the global remote sensing estimation data set of irrigation water use is used. The time series of this data set is monthly. Use this data set to decompose the provincial agricultural water withdrawal data to obtain monthly agricultural water use data;

[0072] For industrial water use data, the high-resolution mapping of China's monthly industrial water withdrawals is used to decompose the provincial industrial water withdrawal data to obtain monthly industrial water withdrawal data;

[0073] For domestic water use data, the global population distribution data is used to downscale the provincial domestic water withdrawals, and the relationship between temperature and domestic water use is introduced to decompose the annual domestic water withdrawal data into monthly domestic water use data:

[0074]

[0075] In the formula: W Dom,m is the regional monthly domestic water consumption; W Dom,a represents the regional annual domestic water consumption; T, T avg 、T max 、T min respectively represent the average temperature of the current month, the annual average temperature, the annual maximum temperature, and the annual minimum temperature; R Dom is the coefficient;

[0076] The water withdrawals for the ecological environment are averaged by provincial data into a monthly distribution;

[0077] For the water transfer data, the China Inter-basin Water Transfer Project Database is used. This database contains the starting basin, the destination basin, and the water transfer volume at the secondary basin level. Use the monthly runoff data in step S210 and the monthly water withdrawal data of each department in step S220 to decompose the water transfer data into monthly water intake and monthly water conveyance data;

[0078] For the available water resources data, use the monthly runoff data in step S210 to decompose the provincial annual available water resources data into monthly available water resources data;

[0079] S230. The key evaluation index data of the social and economic system, the ecological environment system, and the water resources system come from national and provincial statistical data and each data set and are decomposed. Among them,

[0080] Data such as population density, GDP, abnormal surface water storage, NDVI, and elevation use a data product set and are resampled and unified to a grid resolution;

[0081] Data such as per capita water use, water use per 10,000 yuan of GDP, water use per 10,000 yuan of industrial added value, and water use per mu of cultivated land decompose the annual data using population density, GDP, and water use data.

[0082] S3: Construct a natural water cycle health assessment model, input the key elements of the natural water cycle in the key element data set of the natural water cycle into the natural water cycle health assessment model. The natural water cycle health assessment model obtains the natural water cycle balance index NWI as the first evaluation value, and uses the natural water cycle balance index NWI to judge the health status of the natural water cycle:

[0083] When 0 < NWI ≤ 0.15, the health status of the natural water cycle is in a balanced state;

[0084] When 0.15 < NWI ≤ 0.25, the health status of the natural water cycle is in a slightly unbalanced state;

[0085] When 0.25 < NWI ≤ 0.5, the health status of the natural water cycle is in a moderately unbalanced state;

[0086] When 0.5 < NWI , the health status of the natural water cycle is in a severely unbalanced state.

[0087] In this embodiment, since precipitation, as a key water flux, is the most important water source in the region, a part of the precipitation is replenished to surface runoff, the soil vadose zone, and groundwater runoff along with water production and infiltration, a part returns to the atmosphere along with evapotranspiration, and the ratio of the remaining water volume to the water storage (runoff and soil water) in the region represents the renewal and metabolism ability of the key elements of the water cycle, which is used to evaluate the health status of the regional natural water cycle;

[0088] The health status of the natural water cycle can be represented by the natural water cycle balance index. A positive result represents a water surplus state within the grid, and vice versa represents a water deficit state within the grid:

[0089]

[0090] In the formula: NWI is the natural water cycle balance index; P is the grid rainfall; ET is the grid actual evapotranspiration; R is the runoff, which is the sum of surface runoff and groundwater runoff; SW is the soil moisture;ΔSW is the change in soil moisture.

[0091] S4: Construct a social water cycle health assessment model, and input the key elements of the social water cycle in the key element data set of the social water cycle into the social water cycle health assessment model. The social water cycle health assessment model obtains the social water cycle balance index SWI , as the second evaluation value, and judges the health status of the social water cycle through the social water cycle balance index SWI :

[0092] When 0 < SWI ≤1, the health status of the social water cycle is in a balanced state;

[0093] When 1 < SWI ≤1.5, the health status of the social water cycle is in a slightly unbalanced state;

[0094] When 1.5 < SWI ≤2, the health status of the social water cycle is in a moderately unbalanced state;

[0095] When 2 < SWI, the health status of the social water cycle is in a severely unbalanced state.

[0096] Specifically, the total social water intake mainly includes domestic water, agricultural water, industrial water, ecological water, water transfer, etc. The total social water intake in the country has a serious negative impact on the natural water cycle. The present invention uses the ratio of the total regional social water intake and the available water resources to describe the balance degree between the social water cycle and the natural water cycle, and is used to evaluate the health status of the regional social water cycle; for example, by setting a threshold value to judge whether the social water intake exceeds the available water resources, if it exceeds this threshold value, it is considered that the regional social water balance pressure is relatively large.

[0097] Specifically, the health status of the social water cycle can be represented by the social water cycle balance index:

[0098]

[0099] TWC i =W Dom,i +W Agr,i +W Ind,i +W Eco,i +WT I,i -WT O,i ;

[0100] In the formula: SWI is the social water cycle balance index; TWC i is the total grid social water intake; WRA i is the grid available water resources; W Dom,i is the grid domestic water; WAgr,i is the agricultural water use for the grid; W Ind,i is the industrial water use for the grid; W Eco,i is the ecological water use for the grid; WT I,i is the input volume of water transfer for the grid; WT O,i is the output volume of water transfer for the grid.

[0101] S5: Construct an evaluation model for the coordination degree of the cooperation system, and input the key evaluation indicators of the social - economic system, ecological - environmental system, and water - resources system in the key evaluation indicator data sets of each subsystem into the evaluation model for the coordination degree of the cooperation system. The evaluation model for the coordination degree of the cooperation system obtains the coupling coordination degree D among the water - resources system, social - economic system, and ecological - environmental system, and then obtains the absolute value of the difference between the coupling coordination degree and 1 as the third evaluation value D S ; and through the third evaluation value D S ; judge the coordination degree of the cooperation system:

[0102] When 0 < D S ≤ 0.5, the coordination degree of the cooperation system is in a coordinated state;

[0103] When 0.5 < D S ≤ 0.65, the coordination degree of the cooperation system is in a slightly uncoordinated state;

[0104] When 0.65 < D S ≤ 0.8, the coordination degree of the cooperation system is in a moderately uncoordinated state;

[0105] When 0.8 < D S ≤ 1, the coordination degree of the cooperation system is in a severely uncoordinated state.

[0106] Specifically, there are dynamic relationships among the social - economic system, ecological - environmental system, and water - resources system in the water - resources cooperation system, which are driven by competition relationships and cooperation relationships. To promote the healthy operation of the regional water - cycle system, the demand relationships of economic development and the ecological environment for water resources should be quantified. The present invention establishes an evaluation index system for each subsystem in the water - resources cooperation system, calculates the index values of each subsystem, introduces a coupling coordination degree model, quantifies the coordination degree among each subsystem, and uses it to evaluate the coordination state among each subsystem.

[0107] S510. To comprehensively evaluate the state of the water resource cooperation system, the present invention selects representative indicators to evaluate the water resource system, the social and economic system, the ecological environment system and sub-indicators. The indicator values of each subsystem are obtained by linearly weighting the indicator values included in each subsystem. Among them, the water resource indicators of the water resource system are mainly used to describe the key elements of the water resource system in the target area and play an important role in the healthy operation of the water cycle, including total water resources, precipitation, surface water storage anomaly, number of drought days, and number of heavy rainfall days; the social and economic indicators of the social and economic system are mainly used to describe economic water use behaviors, including population density, per capita water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, and water consumption per mu of cultivated land; the ecological environment indicators of the ecological environment system are mainly used to describe the ecological environment level of the research fishing area, including ecological environment water consumption, vegetation coverage and other indicators.

[0108] Table 1: Evaluation indicators of the water resource system, the social and economic system, and the ecological environment system

[0109]

[0110] To avoid ignoring the information carried by the original data due to insufficient subjective judgment, the present invention uses the entropy weight method to assign weights to the indicator values in each subsystem. The entropy weight method is an objective weight calculation method for multi-index comprehensive evaluation, and the calculation of its weight assignment depends on the dispersion degree and information volume of each indicator data; since each indicator may have different dimensions, it is necessary to perform dimensionless processing on the data, so the data after standardization can better meet the calculation conditions.

[0111] Positive index standardization method:

[0112] Negative index standardization method:

[0113] In the formula: x ij represents the value of the i-th evaluation object on the j-th indicator, and the standardized matrix is:

[0114] Calculate the normalized weight of each indicator:

[0115] Calculate the information entropy:

[0116] In the formula: k is a constant used to ensure the normalization of the information entropy;

[0117] Calculate the weight:

[0118] In the formula: 1 - e j represents the effective information volume of the j-th indicator;

[0119] Comprehensive indicators of the social - economic system, ecological environment system, and water resources system:

[0120] S520. In order to truly reflect the interaction relationship and co - evolution mechanism among the social - economic system, ecological environment system, and water resources system in the water resources cooperation system, the present invention uses a coupling coordination degree model to measure the coordination degree among the systems, determines the coupling coordination process of the three subsystems (i.e., the social - economic system, ecological environment system, and water resources system) in the time series, analyzes the co - evolution driving mechanism among the subsystems, and evaluates the coordination state of the social - economic system, ecological environment system, and water resources system in the regional water resources cooperation system according to the coupling coordination level of the water resources cooperation system. The specific calculation process is as follows:

[0121] Coupling degree among the systems:

[0122]

[0123] Coordination degree among the systems:

[0124] T = αWv+βSv + λEv;

[0125] Coupling coordination degree among the systems:

[0126]

[0127] D S = 1 - D;

[0128] In the formula: Wv, Sv, and Ev respectively represent the comprehensive index values of the social - economic system, ecological environment system, and water resources system calculated in step S510; k represents the number of subsystems; α, β, and λ respectively represent the weights of each subsystem.

[0129] S6: Construct a comprehensive water balance health evaluation model, input the obtained first evaluation value, second evaluation value, and third evaluation value into the comprehensive water balance health evaluation model, and the comprehensive water balance health evaluation model outputs a water balance health index WBHI. By judging the water balance health index WBHI:

[0130] When 0 < WBHI ≤ 0.5, the comprehensive water balance health is in a balanced state;

[0131] When 0.5 < WBHI ≤ 0.65, the comprehensive water balance health is in a mild imbalance state;

[0132] When 0.65 < WBHI ≤ 0.75, the comprehensive water balance health is in a moderate imbalance state;

[0133] When 0.75 < WBHI ≤ 1, the comprehensive water balance health is in a severe imbalance.

[0134] Based on the basic concept of the natural - social water cycle, starting from the perspectives of the impacts of climate change and social development on the water cycle, in order to enhance the supporting capacity of the water cycle system, reduce the damage of human activities to the water cycle system, construct the evaluation value of a healthy water balance, and thus obtain the comprehensive health state of water balance health. Given the importance of water to the natural ecosystem, human survival, and social well - being, after determining the health state of the natural water cycle, the health state of the social water cycle, and the coordination degree between each subsystem, the geometric mean is used to calculate the evaluation index of the water balance to express the health state of the water balance.

[0135] Specifically, the health state of the water balance can be represented by the water balance health index:

[0136]

[0137] In the formula: NWI Natural water cycle balance index; SWI Is the social water cycle balance index; D is the coupling coordination degree between each system.

[0138] Embodiment 2

[0139] See Figure 3 , the regional water balance health evaluation device based on the dual water cycle of the present invention includes a data acquisition unit, a data processing unit, a natural water cycle health evaluation unit, a social water cycle health evaluation unit, a cooperation system coordination degree evaluation unit, and a comprehensive water balance health evaluation unit, where

[0140] The data acquisition unit is used to obtain the key element data of the natural water cycle, the key flux data of social water intake, and the key index data of each subsystem within the region;

[0141] The data processing unit is used to perform pre - processing, format conversion, and downscaling on the data in the acquired data set;

[0142] The natural water cycle health evaluation unit is used to evaluate the health state of the natural water cycle according to the key elements of the natural water cycle;

[0143] The social water cycle health evaluation unit is used to evaluate the health state of the social water cycle according to the important fluxes of the social water cycle;

[0144] The cooperation system coordination degree evaluation unit is used to evaluate the coordination degree between each subsystem according to the index values of each subsystem;

[0145] The comprehensive water balance health assessment unit is used to evaluate the regional comprehensive water balance health status according to the evaluation results of the natural water cycle health assessment unit, the social water cycle health assessment unit, and the cooperation system coordination degree assessment unit, and the evaluation result is displayed as the regional water cycle health status.

[0146] The above are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A regional water balance health assessment method based on the dual water cycle, characterized in that, It includes the following steps: S1: Obtain the dataset of the historical period within the target area. The dataset includes the dataset of key elements of the natural water cycle, the dataset of key fluxes of social water intake, and the dataset of key evaluation indicators of each subsystem; S2: Preprocess the data information in the obtained dataset; S3: Construct a natural water cycle health evaluation model, and input the key elements of the natural water cycle in the dataset of key elements of the natural water cycle into the natural water cycle health evaluation model. The natural water cycle health evaluation model outputs the first evaluation value for evaluating the health status of the natural water cycle; S4: Construct a social water cycle health evaluation model, and input the key elements of the social water cycle in the dataset of key elements of the social water cycle into the social water cycle health evaluation model. The social water cycle health evaluation model outputs the second evaluation value for evaluating the health status of the social water cycle; S5: Construct a cooperation system coordination degree evaluation model, and input the key evaluation indicators of the social - economic system, ecological - environmental system, and water - resource system in the dataset of key evaluation indicators of each subsystem into the cooperation system coordination degree evaluation model. The cooperation system coordination degree evaluation model outputs the third evaluation value for evaluating the coordination status among each subsystem; S6: Construct a comprehensive water balance health evaluation model, and input the obtained first evaluation value, second evaluation value, and third evaluation value into the comprehensive water balance health evaluation model. The comprehensive water balance health evaluation model outputs the comprehensive evaluation value for evaluating the health status of the regional comprehensive water balance; Evaluate and analyze the health status of the regional comprehensive water balance through the comprehensive evaluation value.

2. The regional water balance health assessment method based on the dual water cycle according to claim 1, wherein In step S1, the key elements of the natural water cycle in the dataset of key elements of the natural water cycle include surface runoff, groundwater runoff, rainfall, actual evapotranspiration, and soil water content; The key flux data of social water intake in the dataset of key fluxes of social water intake include domestic water consumption, ecological water consumption, industrial water consumption, agricultural water consumption, and water transfer volume; The key index data of each subsystem in the dataset of key evaluation indicators of each subsystem include population density, per capita water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, water consumption per mu of cultivated land, total water resources, precipitation, surface water storage anomaly, drought, heavy precipitation, NDVI, elevation.

3. The regional water balance health assessment method based on the dual water cycle according to claim 1, characterized in that In step S2, the preprocessing includes: unifying the format of the data information in the dataset into TIF raster files, unifying the time resolution of the data information in the dataset into monthly, and unifying the spatial resolution of the data information in the dataset into 0.25° resolution under the WGS - 84 coordinate system.

4. The regional water balance health assessment method based on the dual water cycle according to claim 1, characterized in that In step S3, the natural water cycle health assessment model obtains the first difference between the rainfall and the change amounts of the actual evapotranspiration, surface runoff, groundwater runoff, and soil moisture of the grid, as well as the first sum value among the surface runoff, groundwater runoff, and soil water content, and calculates the ratio between the first difference and the first sum value to obtain the natural water cycle balance index NWI , as the first evaluation value, and uses the natural water cycle balance index NWI to judge the health status of the natural water cycle: When 0 < NWI ≤ 0.15, the natural water circulation is in a healthy and balanced state; When 0.15 < NWI ≤ 0.25, the natural water circulation is in a slightly unbalanced state of health; When 0.25 < NWI ≤ 0.5, the natural water circulation is in a moderately unbalanced state of health; When 0.5 < NWI , the healthy state of the natural water cycle is in a severely imbalanced state.

5. The method for evaluating the regional water balance health based on the dual water cycle according to claim 4, characterized in that, In step S4, the social water cycle health assessment model obtains the total grid social water intake of all grids by calculating the second difference between the second sum of the grid domestic water consumption, grid agricultural water consumption, grid industrial water consumption, grid ecological water consumption, and grid water transfer input volume of all grids and the grid water transfer output volume. By calculating the ratio between the total grid social water intake of all grids and the grid water resources available volume of all grids, the social water cycle balance index is obtained SWI , as the second evaluation value, and through the social water cycle balance index SWI judge the health status of the social water cycle: When 0 < SWI ≤ 1, the healthy state of the social water cycle is in a balanced state; When 1 < SWI ≤ 1.5, the healthy state of the social water cycle is in a mild imbalance state; When 1.5 < SWI ≤ 2, the healthy state of the social water cycle is in a moderately unbalanced state; When 2 < SWI, the health status of the social water cycle is in a severe imbalance state.

6. The regional water balance health assessment method based on the dual water cycle according to claim 5, wherein In step S5, the water - resource indicators of the water - resource system include total water resources, precipitation, surface water storage anomaly, number of drought days, number of heavy rainfall days; The social - economic indicators of the social - economic system include population density, per capita water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, water consumption per mu of cultivated land; The ecological - environmental indicators of the ecological - environmental system include ecological - environmental water consumption, vegetation coverage and other indicators.

7. The regional water balance health assessment method based on the dual water cycle according to claim 6, wherein In step S5, the cooperation system coordination degree evaluation model obtains the coupling degree and coordination degree among the water resources system, the social - economic system, and the ecological environment system, and obtains the product of the coupling degree and the coordination degree to obtain the coupling coordination degree among the water resources system, the social - economic system, and the ecological environment system. Then, the absolute value of the difference between the coupling coordination degree and 1 is obtained as the third evaluation value D S ; and through the third evaluation value D S ; the coordination degree of the cooperation system is judged: When 0 < D S ≤ 0.5, the coordination degree of the cooperation system is in a coordinated state; When 0.5 < D S ≤ 0.65, the coordination degree of the cooperation system is in a slightly uncoordinated state; When 0.65 < D S ≤ 0.8, the coordination degree of the cooperation system is in a moderately uncoordinated state; When 0.8 < D S ≤ 1, the coordination degree of the cooperation system is in a severely uncoordinated state.

8. The regional water balance health assessment method based on the dual water cycle according to claim 7, characterized in that, In step S5, the steps for obtaining the comprehensive index values in the water resource system, social - economic system, and ecological - environmental system are as follows: Step 501: Standardize each index value in the water resource system, social - economic system, and ecological - environmental system; Step 502: Calculate the normalized weights of each index value in the water resource system, social - economic system, and ecological - environmental system; Step 503: Calculate the information entropy according to the obtained normalized weights; Step 504: Calculate the weights according to the obtained information entropy; Step 505: Calculate the comprehensive index values in the water resource system, social - economic system, and ecological - environmental system according to the obtained weights.

9. The regional water balance health assessment method based on the dual water cycle according to claim 8, characterized in that, In step S6, by calculating the natural water cycle balance index NWI , the social water cycle balance index SWI, and the coupling coordination degree D S among various systems, the cube root of the product is obtained as the water balance health index WBHI. By judging the water balance health index WBHI: When 0 < WBHI ≤ 0.5, the comprehensive water - balance health is in a balanced state; When 0.5 < WBHI ≤ 0.65, the comprehensive water - balance health is in a slightly unbalanced state; When 0.65 < WBHI ≤ 0.75, the comprehensive water - balance health is in a moderately unbalanced state; When 0.75 < WBHI ≤ 1, the comprehensive water - balance health is in a severely unbalanced state.

10. A regional water balance health assessment device adopting the regional water balance health assessment method based on the dual water cycle according to any one of claims 1-9, characterized in that It includes a data acquisition unit, a data processing unit, a natural water - cycle health assessment unit, a social water - cycle health assessment unit, a cooperation - system coordination - degree assessment unit, and a comprehensive water - balance health assessment unit. Among them, the data acquisition unit is used to obtain the key element data of the natural water cycle, the key flux data of social water intake, and the key index data of each subsystem in the region; the data processing unit is used to pre - process, convert the format, and downscale the data in the acquired data set; the natural water - cycle health assessment unit is used to assess the health status of the natural water cycle according to the key elements of the natural water cycle; the social water - cycle health assessment unit is used to assess the health status of the social water cycle according to the important fluxes of the social water cycle; the cooperation - system coordination - degree assessment unit is used to assess the coordination degree between each subsystem according to the index values of each subsystem; the comprehensive water - balance health assessment unit is used to assess the health status of the regional comprehensive water - balance according to the assessment results of the natural water - cycle health assessment unit, the social water - cycle health assessment unit, and the cooperation - system coordination - degree assessment unit, and the assessment result is displayed as the health status of the regional water cycle.

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