CN-117408558-B - River health evaluation method and device based on whole river reach space difference analysis

CN117408558BCN 117408558 BCN117408558 BCN 117408558BCN-117408558-B

Abstract

The invention discloses a river health evaluation method and device based on space difference analysis of a whole river reach, and the method comprises the steps of dividing the whole river reach of a target river reach into a plurality of areas with different water body types according to river characteristics, selecting a plurality of evaluation indexes from set criterion layers for the areas with the water body types, respectively obtaining index data of the evaluation indexes of each area in a preset time period, carrying out multi-element coupling evaluation on each area by constructing a POME fuzzy evaluation model and an analysis model based on a triangle fuzzy number based on the index data, so as to obtain ecological health evaluation grades of each area, and analyzing relative differences between each evaluation angle and the ecological health space of the river of the whole river reach by using a Thai index so as to obtain the ecological health coordination condition of the water body of the target river reach. The invention takes the ecological health of the river in the whole river reach as the theme, distinguishes the water body difference, evaluates the health condition of the river from the space angle, and provides new thought and theoretical support for decision makers to guide the river construction.

Inventors

DONG ZENGCHUAN
ZHOU YUEJIAO
CUI XUAN
ZHU SHENGNAN
CHEN LONGJI
YANG BOHUA
Zeng Guangen
LIU YUPENG

Assignees

河海大学
温州市水文管理中心

Dates

Publication Date: 20260508
Application Date: 20231026

Claims (7)

1. A river health evaluation method based on whole river reach space difference analysis is characterized by comprising the following steps: Dividing the whole river reach of the target river basin into a plurality of areas with different water body types according to river characteristics; Selecting a plurality of evaluation indexes from the set criterion layers for the areas of each water body type respectively; Respectively acquiring index data of each evaluation index of each region in a preset time period; Based on the index data, performing multi-element coupling evaluation on each region by constructing a POME fuzzy evaluation model and a set based on a triangle fuzzy number so as to obtain the ecological health evaluation grade of each region; the step of obtaining the ecological health evaluation grade of each region comprises the following steps: Based on the acquired index data of each region, respectively calculating to obtain a first evaluation grade of the ecological health of the water body of each region by constructing a POME fuzzy evaluation model; based on the acquired index data of each region, respectively calculating to obtain second evaluation grades of the ecological health of the water body of each region by constructing a set based on triangle fuzzy numbers; Average value calculation is carried out on the first evaluation level and the second evaluation level, and ecological health evaluation levels of all areas are obtained; The step of respectively calculating the first evaluation grade of the ecological health of the water body in each region by constructing a POME fuzzy evaluation model based on the acquired index data of each region comprises the following steps: Sample values of each index obtained from the region to be evaluated Standard value of classification Matrix of components And Respectively normalized to a fuzzy matrix And ; Constructing Lagrange functions with minimum generalized weighted distance and maximum Shannon entropy between samples to be evaluated and various grades of standards as target problems to obtain an optimal membership fuzzy matrix based on POME fuzzy evaluation Wherein The calculation formula of (2) is as follows: (1) Wherein B is a weighting factor, w i is the weight of the ith index, e ih is the value of the ith index normalized by the h-level grading standard value, f i is the value of the ith index normalized by the sample value, u h is the membership degree of the sample overall to the h-level, m is the number of indexes, and k is the number of levels of the evaluation level; fuzzy matrix based on optimal membership degree The calculation formula for obtaining the first evaluation grade of the ecological health of the water body in the region to be evaluated is as follows: (2) Wherein u h is the membership degree of the sample population of the region to be evaluated to h grades, k is the grade number, A is the total membership degree, namely the first evaluation grade of the region to be evaluated; the step of respectively calculating the second evaluation grade of the ecological health of the water body of each region by constructing a set based on the triangular fuzzy number based on the index data of each region comprises the following steps: according to the principle of set pair analysis, five-membered joint coefficients between sample values of the region to be evaluated and river ecological health evaluation grades are constructed, and the expression is as follows: (3) in the formula, C i is the sample value of the ith index, s ih is the grading standard value of the h grade of the ith index, h=1, 2,..k; The difference coefficients of the ith index deviating from the 2 nd, 3 rd and 4 th grades are respectively shown; ; A contrast coefficient for the ith index sample value; The method comprises the steps of determining the difference coefficient at a grading standard value s i2 ,s i3 ,s i4 by adopting a special value method of an analysis value method, respectively taking i 1i =0.5,i 2i =0,i 3i = -0.5, introducing a triangular ambiguity to represent the ambiguity of the difference coefficient, wherein the formula is as follows: (4) Based on the five-membered coefficient, a calculation formula for obtaining a second evaluation grade of the ecological health of the water body in the region to be evaluated is as follows: (5) Wherein Z is the second evaluation grade of the region to be evaluated, and w i is the weight of the ith index; the joint coefficient of the ith index sample, and m is the number of indexes; And analyzing the relative difference between each evaluation angle and the ecological health space of the river of the whole river reach by using the Taer index so as to obtain the ecological health coordination condition of the water body of the target river basin.
2. The river health evaluation method based on the space difference analysis of the whole river reach according to claim 1, wherein the water body type comprises reservoirs, main flows and tributaries, and each criterion layer comprises a hydrologic criterion layer, a chemical criterion layer, a morphological structure criterion layer, a biological criterion layer and a social service criterion layer.
3. The river health evaluation method based on the space difference analysis of the whole river reach according to claim 2, wherein the selecting a plurality of evaluation indexes from the set criterion layers for the regions of each water body type respectively comprises: The evaluation indexes selected from the hydrologic criterion layer aiming at the reservoir comprise the water resource development utilization rate and the drainage ecological base flow meeting condition; The evaluation indexes selected from the chemical standard layer for the reservoir comprise water quality condition, water quality standard condition of drinking water source, nutrition state, sludge pollution condition and water function area standard rate; The evaluation indexes selected from the morphological structure criterion layer for the reservoir comprise a shoreline ecology index, a reservoir zone vegetation coverage and a reservoir zone artificial interference condition; The evaluation indexes selected from the biological criterion layer for the reservoir comprise phytoplankton density, composition of large benthonic invertebrate community and fish preservation index; the evaluation indexes selected from the social service criterion layer for the reservoir comprise public satisfaction, flood control indexes and water supply indexes; The evaluation indexes selected from the hydrologic criterion layer aiming at the main flow and the tributary comprise the water resource development utilization rate, the flow process variation condition and the ecological flow meeting condition; the evaluation indexes selected from the chemical criterion layer aiming at the main flow and the tributary comprise the quality condition of water quality, the standard condition of water quality of a drinking water source, the pollution condition of bottom sludge and the standard rate of a water functional area; The evaluation indexes selected from the morphological structure criterion layer aiming at the main stream and the tributary comprise river longitudinal communication indexes, shoreline ecology indexes, river bank zone vegetation coverage and river bank zone artificial interference conditions; the evaluation indexes selected from the biological criterion layer aiming at the main flow and the tributary comprise the composition of a large benthonic invertebrate community, the density of phytoplankton and the fish preservation index; The evaluation indexes selected from the social service criterion layer aiming at the main flow and the tributary comprise public satisfaction, flood control indexes and water supply indexes.
4. The river health evaluation method based on the space difference analysis of the whole river reach according to claim 1, wherein the index data comprises a sample value, a grading standard value, a weight and a corresponding score of each index.
5. The river health evaluation method based on the space difference analysis of the whole river reach according to claim 1, wherein the grade of ecological health evaluation is classified into five grades of 1, 2,3, 4 and 5, and the health status categories respectively correspond to very healthy, sub-healthy, unhealthy and sick.
6. The method for evaluating the health of a river based on the analysis of the space difference of the whole river reach according to any one of claims 1 to 5, wherein the step of analyzing the relative difference existing in each evaluation angle and the ecological health space of the river of the whole river reach by using the tayer's indices comprises: the differential analysis among all the regions of the whole river reach is carried out by using the Taer index, and the calculation formula is as follows: (6) Wherein T b represents the Talc index of the difference between the whole river reach of the target river reach, T bp represents the Talc index of the region p in the whole river reach, n p represents the minimum unit number contained in the region p, n p =1, n represents the minimum unit number contained in the whole river reach, n=p, HI p represents the score of the ecological health level of the region p, HI represents the average value of the ecological health level scores of the whole river reach; The contribution degree of the region p to the space difference of the whole river reach is T bp /T b multiplied by 100 percent; The differential analysis of each criterion layer among all regions of the whole river reach is carried out by using the Talc index, and the calculation formula is as follows: (7) Wherein T c represents the Talc index of the difference of the analyzed criterion layer between the whole river reach, T cp represents the Talc index of the region p at the criterion layer, HZ p represents the ecological health level score of the region p at the criterion layer, and HZ represents the average value of the ecological health level score of the whole river reach of the criterion layer; the contribution degree of the region p to the space difference of the criterion layer in the whole river reach is T cp /T c multiplied by 100 percent.
7. A river health evaluation device based on whole river reach spatial difference analysis, characterized in that the river health evaluation method based on whole river reach spatial difference analysis according to any one of claims 1 to 6 is adopted, the device comprising: The dividing module is used for dividing the whole river reach of the target river basin into a plurality of areas with different water body types according to river characteristics; the selecting module is used for selecting a plurality of evaluation indexes from the set criterion layers for the areas of each water body type respectively; The acquisition module is used for respectively acquiring index data of each evaluation index of each region in a preset time period; the multi-element coupling evaluation module is used for performing multi-element coupling evaluation on each region by constructing a POME fuzzy evaluation model and a set based on a triangle fuzzy number on the basis of the index data so as to obtain the ecological health evaluation grade of each region; the space difference analysis module is used for analyzing the relative difference between each evaluation angle and the ecological health space of the river of the whole river reach by using the Taer index so as to obtain the ecological health coordination condition of the water body of the target river basin.

Description

River health evaluation method and device based on whole river reach space difference analysis Technical Field The invention relates to the technical field of river ecological evaluation, in particular to a river health evaluation method and device based on whole-river-section space difference analysis. Background River is an important carrier of earth hydrologic cycle and carries development results of regional society, economy and culture. In recent years, the problems of disordered structures and degraded functions of the river ecosystem are still outstanding, and river health evaluation is used as a tool and gradually applied to the evaluation and management process of the river by the supervision department, so that important basis is provided for river protection. However, most of the current river evaluation uses the whole river as an entry point, the water body is not distinguished according to the river characteristics, the evaluation on the structure and the function of the river is focused, the difference of the ecological health condition in the whole river is ignored, the river construction evaluation system has the problems of single evaluation in space, incomplete evaluation, difficulty in defining which part of the river has defects and the like, and the requirements of people for grasping the high standard requirements of constructing short plates in areas, adjusting construction key points in time, scientifically making treatment guidelines and the like in the research of treating the river health problem under the condition of promoting the high-quality development of the river at present cannot be met. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a river health evaluation method and device based on space difference analysis of a whole river reach. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: In a first aspect, the invention provides a river health evaluation method based on space difference analysis of a whole river reach, which comprises the following steps: Dividing the whole river reach of the target river basin into a plurality of areas with different water body types according to river characteristics; Selecting a plurality of evaluation indexes from the set criterion layers for the areas of each water body type respectively; Respectively acquiring index data of each evaluation index of each region in a preset time period; Based on the index data, performing multi-element coupling evaluation on each region by constructing a POME fuzzy evaluation model and a set based on a triangle fuzzy number so as to obtain the ecological health evaluation grade of each region; And analyzing the relative difference between each evaluation angle and the ecological health space of the river of the whole river reach by using the Taer index so as to obtain the ecological health coordination condition of the water body of the target river basin. With reference to the first aspect, the water body type comprises reservoirs, main flows and tributaries, and each criterion layer comprises a hydrologic criterion layer, a chemical criterion layer, a morphological structure criterion layer, a biological criterion layer and a social service criterion layer. With reference to the first aspect, optionally, the selecting, for each water body type region, a plurality of evaluation indexes from each set criterion layer includes: The evaluation indexes selected from the hydrologic criterion layer aiming at the reservoir comprise the water resource development utilization rate and the drainage ecological base flow meeting condition; The evaluation indexes selected from the chemical standard layer for the reservoir comprise water quality condition, water quality standard condition of drinking water source, nutrition state, sludge pollution condition and water function area standard rate; The evaluation indexes selected from the morphological structure criterion layer for the reservoir comprise a shoreline ecology index, a reservoir zone vegetation coverage and a reservoir zone artificial interference condition; The evaluation indexes selected from the biological criterion layer for the reservoir comprise phytoplankton density, composition of large benthonic invertebrate community and fish preservation index; the evaluation indexes selected from the social service criterion layer for the reservoir comprise public satisfaction, flood control indexes and water supply indexes; The evaluation indexes selected from the hydrologic criterion layer aiming at the main flow and the tributary comprise the water resource development utilization rate, the flow process variation condition and the ecological flow meeting condition; the evaluation indexes selected from the chemical criterion layer aiming at the main flow and the tributary comprise the quality condition of water quality, the standard condition of water qua