Ecological bearing capacity assessment method suitable for EOD mode project

Abstract

The invention discloses an ecological bearing capacity assessment method suitable for an EOD mode project. The method comprises the following steps: collecting and sorting basic data in the aspects of economic society, industrial planning, land utilization, pollutant discharge, environment monitoring, environment planning and the like of an area to be subjected to an EOD project, analyzing and determining the ecological environment characteristics and functions of the area, and determining the EOD project according to the ecological environment category concerned and influenced by the EOD project. A plurality of evaluation indexes are selected from the three aspects of ecological system service supply, human activity influence and natural endowment limitation to construct an ecological environment bearing capacity evaluation system, and current situation evaluation and prediction evaluation after project implementation are carried out on regional ecological environment bearing capacity according to EOD project design data. Regional ecological environment restrictive factors are diagnosed according to the current situation evaluation result, the influence of the EOD project on the regional ecological environment is analyzed according to the prediction evaluation result, and the current situation and the prediction evaluation result are comprehensively analyzed to provide a scientific basis for guiding the EOD to carry out optimization design and further improving the ecological benefit output of the EOD project.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological environment carrying capacity analysis, and more specifically, to an ecological carrying capacity assessment method suitable for EOD model projects. Background Art

[0002] The rapid population growth, accelerated expansion of industrialization and urbanization have made modern China face the major problems of excessive resource consumption and serious ecological damage. In this context, the Eco-environment-oriented development (EOD) model is a new project organization and implementation model to explore the balance between economic development and ecological environmental protection and promote regional ecological sustainable development. Carrying capacity evaluation research is the primary basis for implementing the EOD model. The EOD model has its own development characteristics and historical mission in the new era, and it also puts forward different requirements for the evaluation of carrying capacity. It is difficult to directly replicate and apply the previous carrying capacity evaluation model and analysis model.

[0003] Therefore, it is urgent to re-examine the regional ecological environmental carrying capacity evaluation system from the perspective of EOD, design an ecological environmental carrying capacity assessment method suitable for EOD model projects based on the current research status of ecological environmental carrying capacity evaluation technology at home and abroad and the connotation and demand characteristics of the EOD model, and construct an ecological environmental carrying capacity evaluation model based on the "ecosystem service S-human activity impact I-natural endowment limitation R" ecological environmental carrying capacity EECC framework space to calculate the changes in ecological environmental carrying capacity before and after the implementation of the EOD project; at the same time, combined with the law of land use changes, clarify the impact of different land use types on production, life, and ecology, and clarify the driving factors of changes in comprehensive carrying capacity. It is very necessary to provide scientific basis and technical methods for government decision-making and environmental protection department management. Summary of the invention

[0004] The present invention provides an ecological carrying capacity assessment method applicable to EOD model projects, so as to solve the problem that it is difficult to achieve a balance between aeration volume and sand settling and separation effects in the existing aeration sand settling process.

[0005] According to one aspect of the present invention, there is provided an ecological carrying capacity assessment method applicable to an EOD model project, comprising the following steps:

[0006] Step 1: Collect the ecological and environmental data of land use, pollutant emissions, and environmental monitoring in the area where the EOD project is to be implemented for many years, obtain the distribution characteristics of mountains, rivers, forests, fields, lakes, and grasses in the area, and their ecological and environmental status, so as to obtain the regional ecological and environmental characteristics within the time period;

[0007] Step 2: Determine the dominant functions and ecological and environmental access conditions of the project area based on the economic, social, industrial and environmental planning data of the proposed EOD project;

[0008] Step 3: Based on the ecological environment carrying capacity framework of "ecosystem services S-human activity impact I-natural endowment limitation R", establish an ecological carrying capacity assessment index library, and select multiple evaluation indicators from the index library in combination with the EOD project direction;

[0009] Step 4: Using the data of the first five years in the area where the EOD project is to be implemented as the benchmark value, standardize the evaluation indicators in step 3, objectively weight each indicator through the coefficient of variation method, build an evaluation model through the comprehensive evaluation method, and use this evaluation model to conduct forecast evaluation of the current situation and after the implementation of the EOD project based on the regional current ecological environment data and the EOD project design data;

[0010] Step 5: By normalizing each ecological and environmental carrying capacity index, ARCGIS is used to analyze the spatial variation of regional carrying capacity and identify the constraints on the ecological and environmental carrying capacity of regional EOD project development;

[0011] Step 6: Based on the prediction results of ecological and environmental carrying capacity, ARCGIS is used to analyze the temporal and spatial changes of regional carrying capacity to obtain the potential impact of the EOD project on the ecological and environmental carrying capacity.

[0012] Preferably, based on the above scheme, the evaluation indicators in step 3 include primary indicators, secondary indicators, and tertiary indicators, and the nature of each indicator is positive or negative; wherein the primary indicators include ecosystem services, impacts of human activities, and natural endowment limitations.

[0013] Based on the above scheme, it is preferred that the secondary indicators corresponding to the ecosystem services include ecological material products, regulation service products, cultural service products, and rights and interests products; the tertiary indicators corresponding to the ecological material products include biomass supply, soil conservation capacity, and water conservation capacity; the tertiary indicators corresponding to the regulation service products include soil conservation, water conservation, wind and sand fixation, air purification, water purification, wind and sand fixation capacity, and carbon fixation capacity; the tertiary indicators corresponding to the cultural service products include leisure and recreation, tourism and health care; the tertiary indicators corresponding to the rights and interests products include carbon trading products, pollution discharge rights, water use rights, energy use rights, and forest rights.

[0014] Based on the above scheme, it is preferred that the secondary indicators corresponding to the impact of human activities include pollution load and ecosystem disturbance; the tertiary indicators corresponding to the pollution load include living pollution intensity index (kg / 10,000 yuan), pollution load index, excellent rate of ambient air quality (%), comprehensive utilization rate of industrial solid waste (%), harmless treatment rate of domestic waste (%), soil heavy metals (kg / a), total soil porosity, and fertilizer application per unit of cultivated land area (kg / hm2); the tertiary indicators corresponding to ecosystem disturbance include landscape fragmentation, landscape diversity, landscape stability, vegetation coverage (%), biological abundance index, ecological (river) connectivity, natural coastline retention rate (%), human interference index, and land stress index.

[0015] Based on the above scheme, it is preferred that the secondary indicators corresponding to the natural endowment limitations include desertification and water resources; the tertiary indicators corresponding to desertification include soil fertility (t / a), soil texture, soil conductivity, land sandification sensitivity, rocky desertification sensitivity, salinization sensitivity, and important ecosystem area (%); the tertiary indicators corresponding to water resources include per capita water resources and soil and water loss sensitivity.

[0016] Preferably, based on the above scheme, the standardization of the index in step 4 is divided into positive index standardization and negative index standardization, and the calculation formula is as follows:

[0017] For positive indicators:

[0018] For negative indicators:

[0019] Where i in the formula is the unit participating in the evaluation index, and the total number is n; Y i is the standardized value of the i-th indicator; X ib is the benchmark value of the ith indicator.

[0020] Based on the above scheme, in step 5, the index normalization adopts the following method to determine the benchmark value of the index: for those with national standards, the national standards are used as the benchmark value; for those without national standards, the existing research results are referred to; if there is no national standard solution and no existing research results, the average value of the first five years of project construction is used as the benchmark value.

[0021] Preferably, based on the above scheme, in step 4, the calculation formula of the coefficient of variation method is as follows:

[0022]

[0023] Among them, Y i is the standardized value of the ith indicator; P i is the average value of the i-th index; ρ iis the standard deviation of the ith indicator; R i is the coefficient of variation of the ith indicator; v i Weights determined for the coefficient of variation method.

[0024] Based on the above scheme, the comprehensive evaluation method adopts the form of comprehensive weighting, assigning the weight of the expert score to each indicator, and the calculation formula is as follows:

[0025]

[0026] Among them, D i is the value of the i-th indicator; w i is the combined weight of the ith indicator.

[0027] The invention discloses an ecological carrying capacity assessment method applicable to an EOD model project. The invention collects and organizes basic data on the economy, society, industrial planning, land use, pollutant emission, environmental monitoring, environmental planning and other aspects of the area where the EOD project is to be implemented, analyzes and clarifies the ecological environmental characteristics and functions of the area, selects multiple evaluation indicators from three perspectives of ecosystem service supply (S), human activity impact (I) and natural endowment restriction (R) according to the ecological environmental categories that the EOD project pays attention to and affects, constructs an ecological environmental carrying capacity assessment system, and carries out current status assessment and forecast assessment of the regional ecological environmental carrying capacity after the project is implemented according to the EOD project design data, diagnoses the restrictive factors of the regional ecological environment according to the current status assessment results, analyzes the impact of the EOD project on the regional ecological environment according to the forecast assessment results, and comprehensively analyzes the current status and forecast assessment results to provide a scientific basis for guiding the EOD to carry out optimal design and further improve the ecological benefit output of the EOD project. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] Figure 1 It is a logic block diagram of the ecological carrying capacity assessment method applicable to EOD model projects of the present invention;

[0030] Figure 2 It is a flowchart of the ecological carrying capacity assessment method applicable to EOD model projects of the present invention; DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0033] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0034] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0036] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] See also Figure 1 , and combined with Figure 2 As shown, an ecological carrying capacity assessment method applicable to EOD model projects of the present invention comprises the following steps:

[0039] Step 1: Collect the ecological and environmental data of land use, pollutant emissions, and environmental monitoring in the area where the EOD project is to be implemented for many years, obtain the distribution characteristics of mountains, rivers, forests, fields, lakes, and grasses in the area, and their ecological and environmental status, so as to obtain the regional ecological and environmental characteristics within the time period;

[0040] Step 2: Based on the economic, social, industrial and environmental planning data of the proposed EOD project, the dominant functions of the project area and the ecological and environmental access conditions are determined. The dominant functions include but are not limited to water conservation, windbreak and sand fixation, biodiversity and soil conservation.

[0041] Step 3: Based on the ecological environment carrying capacity framework of "ecosystem services S-human activity impact I-natural endowment limitation R", establish an ecological carrying capacity assessment index library, and select multiple evaluation indicators from the index library in combination with the EOD project direction;

[0042] Among them, the evaluation indicators selected in the present invention include primary indicators, secondary indicators, and tertiary indicators, and the indicator nature of each indicator is positive or negative; among them, the primary indicators include ecosystem services, human activity impacts, and natural endowment limitations.

[0043] The secondary indicators corresponding to the ecosystem services of the present invention include ecological material products, regulation service products, cultural service products, and rights and interests products; the tertiary indicators corresponding to the ecological material products include biomass supply, soil conservation capacity, and water conservation capacity; the tertiary indicators corresponding to the regulation service products include soil conservation, water conservation, wind and sand fixation, air purification, water purification, wind and sand fixation capacity, and carbon fixation capacity; the tertiary indicators corresponding to the cultural service products include leisure and recreation, tourism and health care; the tertiary indicators corresponding to the rights and interests products include carbon trading products, pollution discharge rights, water use rights, energy use rights, and forest rights.

[0044] Specifically, the secondary indicators corresponding to the impact of human activities include pollution load and ecosystem disturbance; the tertiary indicators corresponding to pollution load include living pollution intensity index (kg / 10,000 yuan), pollution load index, excellent rate of ambient air quality (%), comprehensive utilization rate of industrial solid waste (%), harmless treatment rate of domestic waste (%), soil heavy metals (kg / a), total soil porosity, and fertilizer application per unit of cultivated land area (kg / hm2); the tertiary indicators corresponding to ecosystem disturbance include landscape fragmentation, landscape diversity, landscape stability, vegetation coverage (%), biological abundance index, ecological (river) connectivity, natural coastline retention rate (%), human disturbance index, and land stress index.

[0045] Specifically, the secondary indicators corresponding to natural endowment limitations include desertification and water resources; the tertiary indicators corresponding to desertification include soil fertility (t / a), soil texture, soil conductivity, land sandification sensitivity, rocky desertification sensitivity, salinization sensitivity, and important ecosystem area (%); the tertiary indicators corresponding to water resources include per capita water resources and soil and water loss sensitivity.

[0046]

[0047]

[0048]

[0049] Step 4: Using the data of the first five years in the area where the EOD project is to be implemented as the benchmark value, standardize the evaluation indicators in step 3, objectively weight each indicator through the coefficient of variation method, build an evaluation model through the comprehensive evaluation method, and use this evaluation model to conduct forecast evaluation of the current situation and after the implementation of the EOD project based on the regional current ecological environment data and the EOD project design data;

[0050] Step 5: By normalizing each ecological and environmental carrying capacity index, ARCGIS is used to analyze the spatial variation of regional carrying capacity and identify the constraints on the ecological and environmental carrying capacity of regional EOD project development;

[0051] Step 6: Based on the prediction results of ecological and environmental carrying capacity, ARCGIS is used to analyze the temporal and spatial changes of regional carrying capacity to obtain the potential impact of the EOD project on the ecological and environmental carrying capacity.

[0052] Among them, the standardization of indicators in step 4 is divided into positive indicator standardization and negative indicator standardization, and the calculation formula is as follows:

[0053] For positive indicators:

[0054] For negative indicators:

[0055] Where i in the formula is the unit participating in the evaluation index, and the total number is n; Y i is the standardized value of the i-th indicator; X ib is the benchmark value of the ith indicator.

[0056] In step 4, the calculation formula of the coefficient of variation method is as follows:

[0057]

[0058]

[0059] Among them, Yi is the standardized value of the ith indicator; P i is the average value of the i-th index; ρ i is the standard deviation of the ith indicator; R i is the coefficient of variation of the ith indicator; v i Weights determined for the coefficient of variation method.

[0060] Based on the above scheme, the comprehensive evaluation method adopts the form of comprehensive weighting, assigning the weight of the expert score to each indicator, and the calculation formula is as follows:

[0061]

[0062] Among them, D i is the value of the i-th indicator; w i is the combined weight of the ith indicator.

[0063] In step 5, the indicator normalization adopts the following method to determine the benchmark value of the indicator: for those with national standards, the national standards are used as the benchmark value; for those without national standards, the existing research results are referred to; if there are no national standards and no existing research results, the average value of the first five years of project construction is used as the benchmark value.

[0064] For the sake of detailed explanation, the following will explain in detail the application of this evaluation method to an EOD project in the southwest region. The application is as follows:

[0065] (1) Project Overview

[0066] The EOD project mainly includes the ecological carrying capacity assessment of the southwest region. The following will explain in detail its assessment method based on the two project contents of water ecological restoration and water ecological tourism resource industry development.

[0067] (2) Analysis of ecological environment characteristics

[0068] By collecting data on land use, pollutant emissions, and environmental monitoring in the area where the EOD project is to be implemented for many years, it is found that the water resources in the area are relatively abundant and the water quality is relatively good. However, with the development of urban tourism, there is a hidden danger of backward sewage treatment facilities in the urban area, and the regional surface water also faces the risk of water quality deterioration and shrinking water area. The regional water environment governance work should be further strengthened in the future.

[0069] (3) Analysis of ecological functional zoning

[0070] By collecting the National Ecological Functional Zoning (Revised), Yunnan Province Ecological Functional Zoning (Simplified), and the 14th Five-Year Plan for Ecological Construction and Environmental Protection, it can be seen that there are problems such as environmental pollution caused by tourism, tropical landscape destruction, soil erosion and land degradation in the area where the EOD project is to be implemented. Environmental protection work should focus on the urban noise environment governance caused by the development of tourism, the restoration of the sewage environment along the Lancang River and in urban areas, and the upgrading of the restaurant kitchen waste treatment system.

[0071] (4) Evaluation index screening

[0072] Combined with the analysis of regional ecological environment characteristics, ecological functional zoning, and EOD project implementation direction, the three-level indicators were selected from the indicator library as follows: domestic pollution intensity index, vegetation coverage, soil stress, biological abundance index, per capita water resources, soil and water loss sensitivity, and water conservation.

[0073] (5) Calculation of evaluation indicators

[0074] The results after standardization of each indicator are shown in the following table

[0075]

[0076] The weight distribution of each indicator is shown in the following table

[0077]

[0078] The comprehensive evaluation results are shown in the following table

[0079] Current Year (2022) Forecast year (2025) EOD Project Implementation Scope 0.770 0.807

[0080] (6) Identify constraints

[0081] According to the calculation results of the current status year, the domestic pollution intensity index, biological abundance index, per capita water resources, soil erosion sensitivity, and water conservation are the main factors restricting the ecological carrying capacity of the implementation scope of this EOD project. Therefore, it can be determined that there are problems such as excessive domestic sewage discharge, a small proportion of natural habitats such as forests and wetlands, a lack of per capita water resources, a serious soil erosion situation, and weak water conservation capacity in the project area.

[0082] (7) Analysis of the impact of EOD projects on ecological carrying capacity

[0083] According to the calculation results of the forecast year, after the implementation of the EOD project, except for land stress and per capita water resources, all indicators have improved to varying degrees. Among them, the living pollution intensity index has been improved from mild overload to carrying capacity. Although the soil and water loss sensitivity has not been improved to the basic carrying capacity, the indicator value has also been greatly improved compared with 2022.

[0084] The present invention is an ecological carrying capacity assessment method suitable for EOD model projects, which has constructed an ecological environment carrying capacity assessment index library and assessment method for all types of EOD projects, including rural human settlement improvement, air pollution control, solid waste disposal, soil pollution control, mine restoration, water ecological environment management, ecosystem restoration, biomass supply value, soil and water conservation, water source conservation value, windbreak and sand fixation, air purification, water purification, and carbon fixation. Subsequently, according to this method, corresponding indicators can be directly selected from the index library for assessment according to different types of EOD projects, providing technical support for objectively evaluating the ecological benefits of different EOD projects.

[0085] Finally, the method of the present application is only a preferred implementation scheme and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ecological carrying capacity assessment method suitable for EOD model projects, characterized in that: The following steps are involved: Step 1: Collect the ecological and environmental data of land use, pollutant emissions, and environmental monitoring in the area where the EOD project is to be implemented for many years, obtain the distribution characteristics of mountains, rivers, forests, fields, lakes, and grasses in the area, and their ecological and environmental status, so as to obtain the regional ecological and environmental characteristics within the time period; Step 2: Determine the dominant functions and ecological environment access conditions of the project area; Step 3: Based on the ecological environment carrying capacity framework of "ecosystem services S-human activity impacts I-natural endowment restrictions R", establish an ecological carrying capacity assessment index library, and select multiple evaluation indicators from the index library in combination with the EOD project direction; Step 4: Using the data of the first five years in the area where the EOD project is to be implemented as the benchmark value, standardize the evaluation indicators in step 3, objectively weight each indicator through the coefficient of variation method, build an evaluation model through the comprehensive evaluation method, and use this evaluation model to conduct forecast evaluation of the current situation and after the implementation of the EOD project based on the regional current ecological environment data and the EOD project design data; Step 5: By normalizing each ecological and environmental carrying capacity index, ARCGIS is used to analyze the spatial variation of regional carrying capacity and identify the constraints on the ecological and environmental carrying capacity of regional EOD project development; Step 6: Based on the prediction results of ecological and environmental carrying capacity, ARCGIS is used to analyze the temporal and spatial changes of regional carrying capacity to obtain the potential impact of the EOD project on the ecological and environmental carrying capacity.

2. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 1, characterized in that: The evaluation indicators selected in step 3 include primary indicators, secondary indicators, and tertiary indicators, and the nature of each indicator is positive or negative; the primary indicators include ecosystem services, human activity impacts, and natural endowment limitations.

3. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 2, characterized in that: The secondary indicators corresponding to the ecosystem services include ecological material products, regulation service products, cultural service products, and rights and interests products; the tertiary indicators corresponding to the ecological material products include biomass supply, soil conservation capacity, and water conservation capacity; the tertiary indicators corresponding to the regulation service products include soil conservation, water conservation, wind and sand fixation, air purification, water purification, wind and sand fixation capacity, and carbon fixation capacity; the tertiary indicators corresponding to the cultural service products include leisure and recreation, tourism and health care; the tertiary indicators corresponding to the rights and interests products include carbon trading products, pollution discharge rights, water use rights, energy use rights, and forest rights.

4. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 2, characterized in that: The secondary indicators corresponding to the impact of human activities include pollution load and ecosystem disturbance; the tertiary indicators corresponding to pollution load include living pollution intensity index, pollution load index, excellent rate of ambient air quality, comprehensive utilization rate of industrial solid waste, harmless treatment rate of domestic waste, soil heavy metals, total soil porosity, and fertilizer application per unit of cultivated land area; the tertiary indicators corresponding to ecosystem disturbance include landscape fragmentation, landscape diversity, landscape stability, vegetation coverage, biological abundance index, ecological (river) connectivity, natural coastline retention rate, human disturbance index, and land stress index.

5. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 2, characterized in that: The secondary indicators corresponding to the natural endowment limitations include desertification and water resources; the tertiary indicators corresponding to desertification include soil fertility, soil texture, soil conductivity, land sandification sensitivity, rocky desertification sensitivity, salinization sensitivity, and area of ​​important ecosystems; the tertiary indicators corresponding to water resources include per capita water resources and soil and water loss sensitivity.

6. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 2, characterized in that: The standardization of the indicators in step 4 is divided into positive indicator standardization and negative indicator standardization, and the calculation formula is as follows: For positive indicators: For negative indicators: Where i in the formula is the unit participating in the evaluation index, and the total number is n; Y i is the standardized value of the i-th indicator; X ib is the benchmark value of the ith indicator.

7. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 2, characterized in that: In step 5, the indicator normalization adopts the following method to determine the benchmark value of the indicator: for those with national standards, the national standards are used as the benchmark value; for those without national standards or the results of existing studies, the average value of the first five years of project construction is used as the benchmark value.

8. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 6, characterized in that: In step 4, the calculation formula of the coefficient of variation method is as follows: Among them, Y i is the standardized value of the ith indicator; P i is the average value of the i-th index; ρ i is the standard deviation of the ith indicator; R i is the coefficient of variation of the ith indicator; v i Weights determined for the coefficient of variation method.

9. The ecological carrying capacity assessment method applicable to EOD model projects according to claim 6, characterized in that: The comprehensive evaluation method adopts the form of comprehensive weighting, assigning the weight of the expert's score to each indicator. The calculation formula is as follows: Among them, D i is the value of the i-th indicator; w i is the combined weight of the ith indicator.

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