CN-122022543-A - Method for evaluating photovoltaic ecological benefits of stony desertification mountainous areas

CN122022543ACN 122022543 ACN122022543 ACN 122022543ACN-122022543-A

Abstract

A method for evaluating the photovoltaic ecological benefits of a stony desertification mountain area includes such steps as obtaining influence elements, constructing a layered evaluation index system, marking index attributes, constructing a judging matrix, calculating the weight W i of each judging matrix corresponding to each layer element, the maximum characteristic value lambda max and the combined weight W j of all elements relative to the target layer A, obtaining the original data of all indexes, standardized processing, converting to dimensionless values X' ij in the 0-1 interval, calculating the comprehensive score S j and the comprehensive index EI of all indexes by combining with the combined weight W j , and evaluating the grade of the photovoltaic ecological benefits of the stony desertification mountain area according to the comprehensive index EI. The method is suitable for evaluating the ecological benefits of the photovoltaic projects in the stony desertification mountainous areas, has comprehensive evaluation indexes and clear mechanism, and can realize 'target treatment' and forcefully promote the high-quality construction of the photovoltaic projects in the stony desertification mountainous areas.

Inventors

LIANG YONGZHE
ZHANG YU
YANG QINGBIAO
SUN RONG
CHANG LI
CHEN FAN
LIU YONGTAO
ZHANG XUECHI
ZHU JIARUI
ZHAO JUN

Assignees

中国电建集团贵阳勘测设计研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (10)

1. The method for evaluating the photovoltaic ecological benefits of the stony desertification mountainous areas is characterized by comprising the following steps of: obtaining influence elements of the photovoltaic ecological benefit evaluation of the stony desertification mountain area, constructing a layered evaluation index system and marking index attributes, wherein the layered evaluation index system comprises a target layer A, a criterion layer B and an index layer C, and the index attributes comprise positive indexes and negative indexes; constructing judgment matrixes based on the layered evaluation index system, and calculating a weight value W i , a maximum characteristic value lambda max of elements of a corresponding layer of each judgment matrix and a combination weight W j of all elements of the index layer C relative to a target layer A, wherein the judgment matrixes comprise A-B judgment matrixes and a plurality of B-C judgment matrixes; Obtaining the original data of all indexes of the index layer C, performing standardization processing, and converting the original data into a dimensionless numerical value X' ij in a 0-1 interval; Based on the dimensionless number X' ij and the combination weight W j , calculating a comprehensive score S j of all indexes of the index layer C and a comprehensive index EI of the photovoltaic ecological benefits of the stony desertification mountainous areas, wherein the calculation expression of the comprehensive index EI is EI=Σ (S j ) = Σ (W j × X' ij ) (j=1 to 18), and the value range is 0-1; The grade evaluation is carried out on the photovoltaic ecological benefits of the stony desertification mountain areas according to the comprehensive index EI, wherein the value of the comprehensive index EI is closer to 1, and the photovoltaic ecological benefits of the stony desertification mountain areas are represented to be better, and the corresponding grade is higher; And identifying weak links of the ecological benefit in the current grade evaluation, and performing accurate regulation and targeted control to complete the evaluation of the photovoltaic ecological benefit in the stony desertification mountain area, wherein the weak links are indexes with low comprehensive scores S j and corresponding criteria.
2. The method for evaluating the photovoltaic ecological benefits of the stony desertification mountainous areas according to claim 1, wherein the target layer A is the stony desertification mountainous area photovoltaic ecological benefit evaluation A; The criterion layer B comprises soil quality change B1, microclimate change B2, vegetation restoration and influence B3, water and soil conservation benefit B4, biodiversity and habitat influence B5, topography disturbance and restoration B6 and carbon fixation and sink increase B7; The index layer C comprises soil organic matters C1, soil volume weight C2, soil microorganisms C3, atmospheric temperature C4, atmospheric humidity C5, wind speed C6, construction vegetation destruction area C7, vegetation coverage change rate C8, vegetation species diversity C9, runoff reduction rate C10, soil erosion modulus C11, habitat supply C12, habitat crushing degree C13, original landform destruction C14, landscape coordination destruction C15, micro-topography transformation C16, soil organic carbon C17 and carbon dioxide emission reduction C18.
3. The method for evaluating the photovoltaic ecological benefits of the stony desertification mountainous areas according to claim 1, wherein the judging matrix construction process comprises the steps of comparing elements in the same layer two by two based on the layered evaluation index system and constructing a judging matrix according to a relative importance scale method, and the importance scale method comprises 1-9 scale methods.
4. The method for evaluating the photovoltaic ecological benefits of the stony desertification mountainous areas as claimed in claim 3, wherein the process for acquiring the weight value W i of the corresponding layer element comprises the following steps: firstly, normalizing the value of each column of the judgment matrix; secondly, summing the values of each row of the normalized judgment matrix to obtain row sums of each row; And finally, normalizing the row sums to obtain the weight value W i of the corresponding layer element.
5. The method for evaluating the photovoltaic ecological benefits of stony desertification mountainous areas as claimed in claim 4, wherein the calculation process of the maximum eigenvalue lambda max comprises the following steps: obtaining the product of the judgment matrix and the weight value W i of the corresponding layer element to form a new weight value AW i ; based on the new weight value AW i , the maximum eigenvalue λ max is calculated, and the calculation expression is: lambda max = Σ(AW i / W i )/n, where n is the judgment matrix order.
6. The method for evaluating the photovoltaic ecological benefits of stony desertification mountainous areas according to claim 5, characterized in that, before calculating said combining weights W j , a consistency check is performed, comprising: Calculating a consistency index CI, ci= (λ max -n)/(n-1), based on the maximum eigenvalue λ max ; Querying an average random consistency index RI, calculating a consistency ratio CR, cr=ci/RI; when CR is less than 0.10, the consistency test result of the judgment matrix is acceptable, otherwise, the judgment matrix needs to be readjusted.
7. The method for evaluating the photovoltaic ecological benefits of stony desertification mountainous areas according to claim 1, wherein the conversion process of the dimensionless number X' ij comprises: Respectively carrying out standardization treatment on the positive index and the negative index by adopting a standard deviation method, and converting the positive index and the negative index into a dimensionless numerical value X' ij in a 0-1 interval; the conversion formula for the forward index is X' ij= (maxX j - X ij ) / (maxX j - minX j ); The conversion formula for the negative index is X' ij = (maxX j - X ij ) / (maxX j - minX j ); Wherein, X ij is the original value of the j index of the i sample, minX j and maxX j are the minimum value and the maximum value of the j index in all samples, and X' ij is the normalized value.
8. The method for evaluating the photovoltaic ecological benefits of stony desertification mountainous areas according to claim 1, wherein the calculation expression of the comprehensive score S j is: 。
9. The method for evaluating the photovoltaic ecological benefits of the stony desertification mountains according to claim 1, wherein the grade evaluation is to divide the photovoltaic ecological benefits of the stony desertification mountains into four grades of excellent grade, good grade, medium grade and bad grade according to the value of the comprehensive index EI.
10. The method for evaluating the photovoltaic ecological benefits of stony desertification mountainous areas according to claim 9, wherein the classification criteria of the grades are as follows: when EI is more than or equal to 0.8, the rule is preferable; When EI is 0.6≤EI <0.8, dividing into good areas; when EI is 0.4≤EI <0.6, dividing into middle sections; When EI < 0.4), the difference is scored.

Description

Method for evaluating photovoltaic ecological benefits of stony desertification mountainous areas Technical Field The invention relates to the technical field of ecological environment evaluation, in particular to a method for evaluating photovoltaic ecological benefits in stony desertification mountainous areas. Background At present, some technical schemes are used for solving the problem of evaluating the ecological environment influence of a photovoltaic project: For example, patent document CN119990503a discloses a karst stony desertification mountain land photovoltaic field microclimate investigation and evaluation method, but the focus is single and limited to microclimate factors, and the comprehensive ecological influence of the photovoltaic project on soil, vegetation, biodiversity, soil and water conservation and other dimensionalities cannot be comprehensively reflected, so that the evaluation dimensionality is incomplete. The patent document with the publication number of CN120013279A discloses a land degradation process and a space effect analysis method for concentrated photovoltaic development in a plateau region, wherein the analysis is performed from the viewpoint of land degradation, the analysis is focused on the simulation of the process and the space effect, and a set of operational complete index system and calculation model for quantitatively evaluating project-level ecological benefits are lacked. The patent document with the publication number of CN118863991A discloses a method for evaluating the suitability of site selection of a large-scale photovoltaic power station in a desert area and application thereof, wherein the method mainly solves the problem of the suitability of site selection, and the evaluation index is set based on the core characteristics of wind prevention, sand fixation and the like in the desert area. The stony desertification mountain area has obvious differences from the desertification area in terms of hydrothermal conditions, landform process (mainly corrosion), ecological restoration potential and the like, and the index system of the stony desertification mountain area has no direct applicability. For example, patent document with publication number CN117852757A discloses a method for evaluating the ecological environmental effect of desert photovoltaic based on DPSIR model, wherein DPSIR conceptual model is adopted, but the stand point is a desert area, the model frame is macroscopic, and direct and refined index support is lacked for guiding the ecological restoration measure design of the construction period and the operation period of a specific photovoltaic project. The patent document with the publication number of CN118411082B discloses an evaluation method and an evaluation device for the collaborative development condition of a photovoltaic power generation system and an ecological environment, wherein the evaluation is performed from three aspects of environmental benefit, process operation and maintenance management, the cooperation of the operation of a power station and the environment is favored, the evaluation is not performed on the disturbance and restoration benefit of the stony desertification specific ecological problem aiming at project construction, and the positive and negative directions of indexes are not distinguished. However, the prior art has the following 4 disadvantages: Firstly, the existing evaluation method is lack of pertinence, and most of the existing evaluation methods are aimed at regions such as desertification and plateaus, the specificity, the vulnerability and the urgency of treatment of an ecological system in a stony desertification mountain area are not fully considered, and particularly the consideration of key dimensions such as carbon fixation and accumulation, topography disturbance and the like is lacked. Secondly, the indexes are incomplete, the dimension of the evaluation index of the existing method is single, or the core influencing factors of the photovoltaic project on the stony desertification mountain area, such as construction damage, micro-topography transformation, ecological environment fragmentation and the like, cannot be incorporated into a unified and structured evaluation system. The evaluation mechanism is not clear, positive ecological benefits in photovoltaic project construction cannot be clearly distinguished and quantified, such as evaporation reduction, carbon fixation and emission reduction, vegetation restoration promotion, and negative ecological effects, such as construction damage, habitat crushing and landscape damage, are not achieved, and therefore the evaluation result cannot provide a target basis for accurate ecological management and restoration design. Fourthly, operability is to be enhanced, part of the method is complex in model, or index data is difficult to acquire, and the method is inconvenient to popularize and apply in engineering practice. Therefore, a photovo