River function vulnerability evaluation method, equipment, medium and product

Abstract

The invention discloses a river function vulnerability evaluation method and device, a medium and a product, and relates to the technical field of hydraulic engineering and river ecological evaluation.The method comprises the steps that river basic information is obtained; determining index data of river function vulnerability evaluation; constructing a judgment matrix of the index data by utilizing an analytic hierarchy process; calculating a weight vector of the index data according to the judgment matrix; according to the river basic information and the river flood control standard, performing quantitative score assignment on the index data to obtain a score assignment result; calculating a function comprehensive score of the river according to the weight vector and the score assignment result; the function comprehensive score is used for evaluating the river function vulnerability. By introducing the analytic hierarchy process and the multi-index scoring system, a comprehensive evaluation system is constructed from four aspects of river flood control, navigation, water supply and ecology, the river function vulnerability can be reflected more scientifically and comprehensively, and a reference is provided for river management and governance.

Description

Technical Field

[0001] This application relates to the technical fields of water conservancy projects and river ecological assessment, and particularly relates to a method, device, medium, and product for evaluating the vulnerability of river functions. Background Art

[0002] Rivers are important components of ecosystems, undertaking multiple functions such as flood control, navigation, water supply, and ecology, and are crucial for regional social economy and ecological security. However, affected by both natural evolution and human activities, the vulnerability of river functions is becoming increasingly apparent, including problems such as declining levee safety, river channel siltation, unsmooth waterways, and water quality deterioration, which severely restrict the sustainable exertion of river functions. Therefore, scientific evaluation of the vulnerability of river functions is crucial for the scientific management of rivers.

[0003] Existing river function evaluation methods usually target single functions, such as flood control ability or ecological function, lacking a comprehensive evaluation of river functions and being difficult to comprehensively reflect the health status of river functions. At the same time, the existing evaluation methods are too single in the scoring rules and fail to design reasonable quantitative criteria according to the characteristics of different functions, resulting in insufficient accuracy of the evaluation results. Summary of the Invention

[0004] The purpose of this application is to provide a method, device, medium, and product for evaluating the vulnerability of river functions, which can construct a comprehensive evaluation system and can more scientifically and comprehensively reflect the vulnerability of river functions.

[0005] To achieve the above purpose, this application provides the following solutions: In the first aspect, this application provides a method for evaluating the vulnerability of river functions, and the method for evaluating the vulnerability of river functions includes: Obtain basic river information; Determine the index data for evaluating the vulnerability of river functions; the index data includes: levee compliance rate, change rate of cross-sectional area of flowing water, river regime stability, impact of water-related projects, width-depth ratio, swing amplitude of thalweg, incision amplitude of riverbed, water use efficiency, intensity of saltwater intrusion, biodiversity, guarantee rate of ecological water demand, water quality level, and biological habitat; Construct a judgment matrix of the index data by using the analytic hierarchy process; Calculate the weight vector of the index data according to the judgment matrix; Quantitatively score the index data according to the basic river information and river flood control standards to obtain a scoring result; Calculate the comprehensive function score of the river according to the weight vector and the scoring result; the comprehensive function score is used to evaluate the vulnerability of river functions.

[0006] Optionally, constructing the judgment matrix of the index data by using the analytic hierarchy process specifically includes: Constructing a hierarchical structure model; the hierarchical structure model includes: an objective layer, a criterion layer, and a scheme layer; the objective layer is the river function vulnerability assessment; the criterion layer includes: river flood control function data, river navigation function data, river water supply function data, and river ecological function data; the scheme layer includes: levee compliance rate, cross-sectional area change rate, river regime stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater intrusion intensity, biodiversity, ecological water demand guarantee rate, water quality level, and biological habitat; Constructing the judgment matrix of the index data according to the hierarchical structure model.

[0007] Optionally, quantifying and scoring the index data according to the river basic information and the river flood control standard to obtain a scoring result, specifically including: Dividing the index data into four parts according to functions, namely river flood control function data, river navigation function data, river water supply function data, and river ecological function data, and performing quantitative scoring according to the river basic information and the river flood control standard; Among them, Scoring the river flood control function data includes: scoring the levee compliance rate, scoring the cross-sectional area change rate, scoring the river regime stability, and scoring the impact of water-related projects; Scoring the river navigation function data includes: scoring the navigation width ratio and scoring the deep channel swing amplitude; Scoring the river water supply function data includes: scoring the riverbed incision amplitude, scoring the water use efficiency, and scoring the saltwater intrusion intensity; Scoring the river ecological function data includes: scoring the biodiversity, scoring the ecological water demand guarantee rate, scoring the water quality level, and scoring the biological habitat.

[0008] Optionally, The formula for scoring the levee compliance rate is: ; Among them, FHDB is the scoring result of scoring the levee compliance rate; FH is the flood control standard; CG is the levee top elevation; DBL is the compliance rate of the existing levees; The formula for scoring the cross-sectional area change rate is: ; Among them, represents the scoring result of scoring the cross-sectional area change rate; represents the river section length; represents the distance between two cross-sections; Let \(N\) represent the total number of river cross-sections, and \(i\) represent the \(i\)-th cross-section; The formula for scoring the stability of the river regime is: ; where \(AW\) represents the scoring result for the stability of the river regime; \(AG\) represents the score for the bank slope height; \(AJ\) represents the score for the bank slope substrate; \(KSB\) represents the score for the river width-depth ratio; The formula for scoring the degree of riverbed incision is: ; where is the scoring result for the degree of riverbed incision; \(\theta\) is the average value corresponding to the evaluation year; is the average value of the deepest points in the years when obvious changes in riverbed scouring and silting occurred in the river reach; The formula for scoring the water use efficiency is: ; where \(XL\) represents the comprehensive water use efficiency; \(TZ\) represents the characteristic values of each water use index; \(TZa\) represents the basin average value of each water use index.

[0009] Optionally, after calculating the comprehensive functional score of the river based on the weight vector and the scoring results, it further includes: Classifying the corresponding river according to the comprehensive functional score; when the comprehensive functional score is between 80 - 100, the corresponding river is classified as safe; when the comprehensive functional score is between 60 - 80, the corresponding river is classified as relatively vulnerable; when the comprehensive functional score is between 40 - 60, the corresponding river is classified as vulnerable; when the comprehensive functional score is between 0 - 40, the corresponding river is classified as severely vulnerable.

[0010] Optionally, the calculation formula for the comprehensive functional score of the river basic information based on the weight vector and the scoring results is: ; where \(w_i\) is the weight of the \(i\)-th index data in the weight vector, \(X_i\) is the score of the \(i\)-th index data in the scoring results, \(n\) is the total number of index data, and \(S\) is the comprehensive functional score.

[0011] Optionally, calculating the weight vector of the index data according to the judgment matrix specifically includes: Calculating the maximum eigenvalue of the judgment matrix to obtain the eigenvector; Taking the eigenvector as the weight vector.

[0012] In a second aspect, the present application provides a computer device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the river function vulnerability evaluation method described in any one of the above.

[0013] In a third aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the river function vulnerability evaluation method described in any one of the above.

[0014] In a fourth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the river function vulnerability evaluation method described in any one of the above.

[0015] According to the specific embodiments provided by the present application, the following technical effects are disclosed in the present application: The present application provides a river function vulnerability evaluation method, device, medium and product. The method includes: obtaining river basic information; determining index data for river function vulnerability evaluation; the index data includes: levee compliance rate, cross-section change rate, river regime stability, influence of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, salt tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality level, and biological habitats; constructing a judgment matrix of the index data by using the analytic hierarchy process; calculating a weight vector of the index data according to the judgment matrix; quantitatively scoring the index data according to the river basic information and the river flood control standard to obtain a scoring result; calculating a comprehensive function score of the river according to the weight vector and the scoring result; the comprehensive function score is used to evaluate the river function vulnerability. By introducing the analytic hierarchy process (AHP) and a multi-index scoring system, the present application constructs a comprehensive evaluation system from four aspects of river flood control, navigation, water supply and ecology, which can more scientifically and comprehensively reflect the river function vulnerability and provide a reference for river management and governance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0017] Figure 1 It is an application environment diagram of a river function vulnerability evaluation method in an embodiment of the present application; Figure 2 It is a flowchart of a river function vulnerability evaluation method provided in an embodiment of the present application; Figure 3 Schematic diagram of the hierarchical structure model provided by an embodiment of the present application; Figure 4 Schematic diagram of a calculation result provided by an embodiment of the present application; Figure 5 Schematic diagram of the structure of a computer device provided by an embodiment of the present application. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0019] The present application conducts a scientific and comprehensive vulnerability assessment on the flood control function, navigation function, water supply function, and ecological function of rivers through steps such as data collection, evaluation index selection, weight calculation, and comprehensive scoring by assigning scores, and is used for decision-making support for river management and governance.

[0020] The present application is used to comprehensively evaluate the health status of the flood control function, navigation function, water supply function, and ecological function of rivers, identify weak links in functions, and provide a scientific basis for river management and governance, mainly including the following steps: 1. Data collection and collation: Obtain basic information of the river, including measured data of indicators such as dike safety, compliance rate of flood control projects, width-depth ratio, amplitude of thalweg swing, amplitude of riverbed incision, and biodiversity.

[0021] 2. Evaluation index selection and weight calculation: According to the functional characteristics of the river, a three-level evaluation system consisting of an objective layer, an element layer, and an index layer is constructed, and the analytic hierarchy process (AHP) is used to calculate the weights of each index to ensure the rationality of weight distribution.

[0022] 3. Index scoring and comprehensive scoring: By quantifying the indexes and assigning scores, the comprehensive evaluation score of the river function is calculated in combination with the index weights, and the river vulnerability is classified into four levels: "safe", "relatively vulnerable", "vulnerable", and "severely vulnerable".

[0023] Through the above method, the present invention can comprehensively reflect the health status of river functions, solve problems such as the insufficient comprehensiveness of the evaluation system and the unscientific weight distribution in the prior art, and provide a basis for the reasonable development and protection of river functions.

[0024] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0025] The river function vulnerability evaluation method provided by the embodiments of the present application can be applied to an application environment as follows Figure 1 shown. Among them, the terminal 102 communicates with the server 104 through a network. The data storage system can store the data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can send the basic river information to be processed to the server 104. After receiving the basic river information to be processed, the server 104 determines the index data for river function vulnerability evaluation; the index data includes: dike compliance rate, cross-sectional change rate, river regime stability, impact of water-related projects, navigation width ratio, amplitude of thalweg swing, amplitude of riverbed incision, water use efficiency, salt tide intensity, biodiversity, ecological water demand guarantee rate, water quality level, and biological habitat; use the analytic hierarchy process to construct the judgment matrix of the index data; calculate the weight vector of the index data according to the judgment matrix; quantify and score the index data according to the basic river information and the river flood control standard to obtain a scoring result; calculate the comprehensive function score of the river according to the weight vector and the scoring result; the comprehensive function score is used to evaluate the river function vulnerability. The server 104 can feedback the obtained comprehensive function score to the terminal 102. In addition, in some embodiments, the river function vulnerability evaluation method can also be implemented by the server 104 or the terminal 102 alone. For example, the terminal 102 can directly process the basic river information to be processed, or the server 104 can obtain the basic river information to be processed from the data storage system and process it.

[0026] Among them, the terminal 102 can be, but is not limited to, various desktop computers, laptop computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The server 104 can be implemented by an independent server or a server cluster composed of multiple servers, and can also be a cloud server.

[0027] In an exemplary embodiment, as Figure 2 shown, a river function vulnerability evaluation method is provided. This method is executed by a computer device, and can be specifically executed by a computer device such as a terminal or a server alone, or jointly executed by a terminal and a server. In the embodiments of the present application, taking this method applied to Figure 1 the server 104 in as an example for illustration, it includes the following steps S1 to S6. Among them: S1. Obtain the basic river information.

[0028] In this embodiment, the following data is obtained through various channels such as field research, remote sensing images, basin hydrological data, and engineering archives: ① River flood control function data: Dike flood control standards, embankment top elevation, flood control project compliance rate, widths, water depths, and areas of floodplains at multiple typical cross-sections of the evaluated river reaches (including recent and historical data), heights of near-shore slopes, substrates of near-shore slopes, changes in width-depth ratios at typical cross-sections, and backwater heights caused by near-shore water-related projects and other basic data.

[0029] ② River navigation function data: Underwater terrain data and the swing amplitude of thalwegs in the evaluated river reaches.

[0030] ③ River water supply function data: Historical deepest points of the riverbed, recent deepest points of the riverbed, characteristic values and averages of per capita comprehensive water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, and actual irrigation water consumption per mu of cultivated land in the basin where the evaluated river is located, average annual number of saltwater intrusion events in history, and number of saltwater intrusion events during the evaluated year.

[0031] ④ River ecological function data: Results of biodiversity assessment, average annual flow in the evaluated river reaches, daily average flow during the evaluated year, measured water quality conditions during the evaluated year, and changes in the area of river shoals in the evaluated river.

[0032] S2. Determine the index data for river function vulnerability assessment; the index data includes: dike compliance rate, change rate of cross-sectional area of water flow, river regime stability, impact of water-related projects, navigation width ratio, swing amplitude of thalweg, incision amplitude of riverbed, water use efficiency, saltwater intrusion intensity, biodiversity, ecological water demand guarantee rate, water quality level, and biological habitat.

[0033] In this embodiment, according to the river function characteristics, key evaluation indicators reflecting its flood control, navigation, water supply, and ecological functions are selected to obtain the index data.

[0034] S3. Use the analytic hierarchy process to construct a judgment matrix for the index data.

[0035] First, construct a three-level evaluation system of the target layer, criterion layer, and scheme layer as shown in Figure 3 (construct a hierarchical structure model). Among them, the hierarchical structure model includes: the target layer, the criterion layer, and the scheme layer; the target layer is the river function vulnerability assessment; the criterion layer includes: river flood control function data, river navigation function data, river water supply function data, and river ecological function data; the scheme layer includes: dike compliance rate, change rate of cross-sectional area of water flow, river regime stability, impact of water-related projects, navigation width ratio, swing amplitude of thalweg, incision amplitude of riverbed, water use efficiency, saltwater intrusion intensity, biodiversity, ecological water demand guarantee rate, water quality level, and biological habitat; then construct a judgment matrix for the index data according to the hierarchical structure model.

[0036] S4. Calculate the weight vector of the index data according to the judgment matrix.

[0037] Specifically, the analytic hierarchy process (AHP) is used to construct a judgment matrix, and through consistency checking, the weight of each index is calculated. The core of the analytic hierarchy process is the construction of the judgment matrix, that is, the comprehensive comparison of the importance degrees of each index. In the river function evaluation index system, there are 4 evaluation indexes including flood control, navigation, water supply, and ecology. Among them, in flood control evaluation, situations such as dikes, flood discharge, and backwater need to be considered; in waterway evaluation, situations such as waterway scale and waterway stability need to be considered; in water supply and ecology, situations such as water level, organisms, and water quality need to be considered. Figure 3 It is an example of the weight calculation matrix for constructing the river function vulnerability evaluation system by the analytic hierarchy process (the weight is the recommended weight for the river function vulnerability evaluation of a certain large river estuary section, and it should be adjusted according to the actual river situation when using this embodiment).

[0038] The process of constructing the judgment matrix by the analytic hierarchy process (AHP) in this embodiment is as follows: 1. Construct a hierarchical structure model: First, clarify the decision-making problem and decompose it into an objective layer, a criterion layer, and a scheme layer. The objective layer is the ultimate goal of the decision-making, the criterion layer contains various factors affecting the decision-making, and the scheme layer is the available options or strategies.

[0039] 2. Construct a judgment matrix: In the criterion layer, the decision maker needs to make pairwise comparisons according to the relative importance between the criteria and give quantitative judgment values using the 1-9 scale method. These values form a judgment matrix. For example, if criterion A is slightly more important than criterion B, then fill in 3 at the matrix position corresponding to A and B, and fill in 1 / 3 vice versa.

[0040] The steps for constructing the judgment matrix are as follows: Ensure that the elements are compared at the same level; consider that different elements may have different evaluation criteria when compared with different aspects; use the pairwise comparison method or the random pairing method to avoid subjective biases.

[0041] 3. Consistency checking: To ensure the consistency of the judgment matrix, it is necessary to calculate the consistency index CI and the consistency ratio CR. CR = CI / RI, where RI is the random consistency index, which is related to the matrix order. Usually, if the CR value is less than 0.1, it is considered that the consistency of the judgment matrix is acceptable.

[0042] 4. Calculate the weight vector: The weight vector is obtained by solving the maximum eigenvalue and the corresponding eigenvector of the judgment matrix. The weight represents the importance degree of each factor in achieving the goal.

[0043] S5. Quantitatively assign scores to the index data according to the river basic information and the river flood control standard to obtain the score result.

[0044] In this embodiment, according to the basic river information and river flood control standards, the index data is divided into four parts according to functions: river flood control function data, river navigation function data, river water supply function data, and river ecological function data, and quantitative scoring is carried out. It should be noted that in this embodiment, the above-mentioned collected basic river information is scored.

[0045] (1) Scoring the river flood control function data (river flood (tide) scoring standard) includes: ① Scoring the levee compliance rate: According to the levee flood control standard, the embankment top freeboard, and the project compliance rate, calculate through the formula: ; In the formula, FHDB - the score of the river flood control project compliance rate; FH - the flood control standard; CG - the embankment top freeboard, m; DBL - the compliance rate of the existing levees, DBL = RDA / RD * 100, where RDA is the length of the levees that reach the flood control standard of the river, and RD is the total length of the river levees.

[0046] Examples of scoring for each index are as follows in the table (this scoring table is the recommended value for scoring the levees in a certain section of the estuary of a large river. When using this scoring table, it should be adjusted according to the actual evaluation of the river situation): Table 1 Scoring Table for Flood (Tide) Project Compliance Rate (Example)

[0047] ② Scoring the change rate of the water-crossing section: The characteristic value of the water-crossing section area adopts the calculation method of the cross-sectional area of the floodplain channel at the reach scale. This method obtains the representative average morphological parameters of this characteristic value in the whole reach by calculating the logarithmic geometric mean of the cross-sectional area of the floodplain channel of multiple cross-sections in the reach. The specific formula is as follows: ; In the formula, represents the scoring result of the change rate of the water-crossing section, and it can also represent the width of the cross-sectional area of the floodplain channel at the reach scale ( ), water depth ( ), area ( ) (the scoring result can also represent these three); represents the reach length; represents the distance between two cross-sections; represents the total number of river cross-sections, and i represents the i-th cross-section.

[0048] The area increase ratio is scored by comparing the calculated eigenvalue in the evaluation year with the benchmark value in the typical year. The characteristic cross-section area ratio is scored by taking the ratio of the calculated eigenvalue in the evaluation year to the minimum cross-section area within the river reach. The scoring representation is shown in Table 2 (this scoring table is the recommended value for the cross-section change rate scoring of a certain large river estuary section. When using this scoring table, it should be adjusted accordingly according to the actual river conditions to be evaluated).

[0049] Table 2 Cross-section change rate scoring table

[0050] ③ Score the river regime stability: From the perspective of the evaluation difficulty, the evaluation indicators for river regime stability are mainly considered from three aspects: bank slope height, bank slope substrate, and river channel width-depth ratio. For the single-section cross-section, the value of the bank slope height is determined according to the left and right edges of the river bank; for the compound-section cross-section, the first slope near the left and right edges of the river bank is considered. The overall stability score of the river reach is considered as the average value of multiple cross-sections.

[0051] ; In the formula, AW - Scoring of the stability index of river-lake-reservoir banks; AG - Score of bank slope height; AJ - Score of bank slope substrate; KSB - Score of river channel width-depth ratio. The scoring representation is shown in Table 3 (this scoring table is the recommended value for the river regime stability scoring of a certain large river estuary section. When using this scoring table, it should be adjusted accordingly according to the actual river conditions to be evaluated).

[0052] Table 3 River regime stability scoring table

[0053] ④ Score the impact of water-related projects: According to the impact of port terminals, water intake and drainage, and tidal flat development and utilization projects on flood control, consider their backwater conditions. Take the reference water level and determine the score according to the backwater amplitude in the evaluation year. In addition, consider the impact of near-shore erosion on the project stability to correct the result. The scoring representation is shown in Table 4 (this scoring table is the recommended value for the impact scoring of water-related projects in a certain large river estuary section. When using this scoring table, it should be adjusted accordingly according to the actual river conditions to be evaluated).

[0054] Table 4 Impact scoring table of water-related projects

[0055] (2)Scoring the river navigation function data (river navigation scoring standard) includes: ① Score the navigation width ratio: Channel depth is one of the basic conditions for ship navigation. It is the main factor restricting ship tonnage and passing capacity, and also the main factor for selecting ship draft and deadweight. Channel depth depends on the minimum water depth along the channel and is affected by factors such as navigation-obstructing shoals. The width of the channel refers to the horizontal distance measured perpendicular to the center line of the channel between the boundaries on both sides of the channel.

[0056] According to the measured topographic data of the river section to be evaluated, a channel depth map under typical channel depth conditions of the evaluation river section can be drawn, and the minimum section ratio under typical channel depth can be calculated. Score assignment is carried out by comprehensively considering the minimum channel width ratio of the river channel and the channel navigation conditions. An example of score assignment is shown in Table 5 (this score assignment table is the recommended value for the channel width ratio score assignment of a certain large river estuary section. When using this score assignment table, it should be adjusted accordingly according to the actual situation of the evaluated river).

[0057] Table 5 Channel Width Ratio Score Assignment Table

[0058] ② Score assignment for the swing amplitude of the thalweg: The swing of the thalweg reflects the change of the main stream, affects the change trend of the erosion and deposition in the deep trough, and thus affects the stability of the channel. Compare the lateral swing amplitude of the thalweg in the evaluation year with that in the previous time period, and use the ratio of the average distance of the thalweg from the bank in the river section to the multi-year average as the evaluation standard for the swing amplitude of the thalweg. An example of score assignment is shown in Table 6 (this score assignment table is the recommended value for the thalweg swing amplitude score assignment of a certain large river estuary section. When using this score assignment table, it should be adjusted accordingly according to the actual situation of the evaluated river).

[0059] Table 6 Thalweg Swing Amplitude Score Assignment Table

[0060] (3) Score assignment for the river water supply function data (river water supply score assignment standard) includes: ① Score assignment for the incision amplitude of the riverbed: Referring to the concept of the average of river scales, collect the data of the historical deepest points and the recent deepest points of each typical cross-section of the river, and calculate the change amplitude of the average value of the deepest points of the typical cross-sections representing the riverbed depth of the evaluation river section. Take the average value of the deepest points in the year when obvious erosion and deposition occur in the river section as the characteristic value (m), assign 80 points, the average value corresponding to the evaluation year is θ (m), and the score for this index is , is the score value assigned to the incision amplitude index of the riverbed.

[0061] ② Score assignment for water use efficiency: Adopt comprehensive water use efficiency evaluation, and use the per capita comprehensive water consumption, water consumption per 10,000 yuan of GDP, water consumption per 10,000 yuan of industrial added value, and actual irrigation water consumption per mu of cultivated land in the basin where the evaluation area is located as characteristic values, and calculate the ratio of the corresponding characteristic values in the evaluation area to the basin average value.

[0062] ; Among them, XL represents the comprehensive water use efficiency; TZ represents the characteristic values of each water use index; TZa represents the basin average value of each water use index.

[0063] ③ Assign scores to the saltwater intrusion intensity (rivers in the tidal current area): Saltwater intrusion only occurs in the rivers in the tidal current area, and this index does not need to be considered for inland rivers. The preliminary scope is delimited according to the harm degree of the saltwater intrusion in the current year. Taking the average annual number of saltwater intrusion times as the reference value, it is corrected according to the ratio of the change range of the number of times in the evaluation year to the average intrusion times. The score assignment table is shown in Table 7: Table 7 Saltwater Intrusion Intensity Score Assignment Table

[0064] (4) Assign scores to the river ecological function data (river ecological score assignment standard), including: ① Assign scores to biodiversity: The evaluation index of biodiversity is evaluated by a qualitative evaluation method. Considering the research results, research reports, relevant project materials, etc. in the evaluation year, the structural composition and species number of the biological community are comprehensively considered. The biodiversity of the river section is generally evaluated in 5 levels: rich, relatively rich, general, less, and none. The score assignment table is shown in Table 8: Table 8 Biodiversity Score Assignment Table

[0065] ② Assign scores to the ecological water demand guarantee rate: For the calculation of the ecological water demand guarantee rate, calculate the percentage of the minimum daily average flow from April to September and from October to March of the following year in the corresponding period's multi-year average flow respectively, and take the lower value of the two. The score assignment table is shown in Table 9: Table 9 Ecological Water Demand Guarantee Rate Score Assignment Table

[0066] ③ Assign scores to the water quality quality: Scores are assigned according to the proportion of river water quality categories. The proportion of water quality categories follows the Surface Water Environment Quality Standard. In actual evaluation, the scores are determined according to the measured water quality status and proportion in the evaluation year. The score assignment table is shown in Table 10: Table 10 Water Quality Quality Score Assignment Table

[0067] ④ Assign scores to biological habitats: Evaluate the suitability of biological habitats from the perspective of the change range of the area of the sandbanks. Among them, for the calculation of the overall erosion and deposition change rate of the sandbanks, σ = ΔS / S is used, where ΔS is the difference in the area of the sandbanks between two statistics, and S is the average value of the area of the sandbanks between two statistics. For multiple sandbanks, the area change rate is adjusted by comprehensively considering the ratio of the area of each sandbank to the total area of the sandbanks. The scoring table is shown in Table 11.

[0068]

[0069] S6. Calculate the comprehensive function score of the river according to the weight vector and the scoring result; the comprehensive function score is used to evaluate the vulnerability of the river function.

[0070] In this embodiment, the scores of each index are summarized according to the weights to calculate the comprehensive function score. The calculation formula is: ; where wi is the weight of the i-th index data in the weight vector, Xi is the score of the i-th index data in the scoring result, n is the total number of index data, and S is the comprehensive function score. The final calculation result is as Figure 4 shown.

[0071] Use the comprehensive function score for vulnerability grading, which is divided into safe (80 - 100), relatively vulnerable (60 - 80), vulnerable (40 - 60), and severely vulnerable (0 - 40).

[0072] This embodiment relates to a method for evaluating the vulnerability of river functions, including the following steps: data collection and collation; selection of evaluation indicators, including four functions of river flood control, river navigation, river water supply, and river ecology and their related indicators; calculating the index weights by using the analytic hierarchy process; scoring the indicators according to the quantization standard and the measured data, and calculating the comprehensive score according to the weights; dividing the vulnerability levels based on the comprehensive score, and analyzing the weak points of the functions. The present invention comprehensively considers multiple functions of river flood control, navigation, water supply, ecology, etc. Through a scientific and reasonable evaluation index system and scoring standard, it can accurately evaluate the vulnerability of river functions, providing a scientific, comprehensive, and accurate basis for the management and renovation of rivers, and having important practical application value.

[0073] In another exemplary embodiment, a method for evaluating the vulnerability of river functions is provided, including the following steps: 1) Data collection and collation: Obtain the basic information of the target river and the data required for evaluation. The data includes flood control function data, navigation function data, water supply function data, and ecological function data.

[0074] 2) Selection of evaluation indicators and calculation of weights: A three-level evaluation system is constructed according to the functional characteristics of the river, including the target layer, the element layer, and the indicator layer. The analytic hierarchy process (AHP) is used to calculate the weights of each indicator.

[0075] 3) Scoring of indicators and comprehensive scoring: Each indicator is scored according to the quantification index and the scoring standard, and the comprehensive score of the river function is calculated by combining the weights of each indicator.

[0076] 4) Classification of vulnerability levels: The vulnerability of the river function is divided into four levels: safe, relatively vulnerable, vulnerable, and severely vulnerable according to the comprehensive score.

[0077] 5) Analysis of weak points of functions: Based on the vulnerability level, the weak links affecting the river function are identified, and corresponding treatment suggestions are provided.

[0078] Among them, the data collection and collation in step 1) include obtaining data through various methods such as field investigations, remote sensing images, hydrological data, and engineering archives.

[0079] Among them, the calculation of weights using the analytic hierarchy process in step 2) includes constructing a judgment matrix, performing a consistency test, and calculating weights.

[0080] Among them, the scoring in step 3) designs quantification criteria based on different functional characteristics, including the scoring standard for the flood control function of the river; the scoring standard for the navigation function of the river; the scoring standard for the water supply function of the river; the scoring standard for the ecological function of the river.

[0081] Among them, the scoring standard for the flood control function of the river includes scoring the levee compliance rate, the change rate of the cross-sectional area, the stability of the river regime, and the impact of water-related projects.

[0082] Among them, the scoring standard for the navigation function of the river includes scoring the width-depth ratio and the swing amplitude of the thalweg.

[0083] Among them, the scoring standard for the water supply function of the river includes scoring the incision amplitude of the riverbed, the water use efficiency, and the intensity of saltwater intrusion (not applicable to inland rivers).

[0084] Among them, the scoring standard for the ecological function of the river includes scoring the biodiversity, the guarantee rate of ecological water demand, the quality of water, and the change of biological habitats.

[0085] Among them, the vulnerability classification in step 4) is divided into the following four levels according to the comprehensive score: Safe: The comprehensive score is between 80 - 100; Relatively vulnerable: The comprehensive score is between 60 - 80; Vulnerable: The comprehensive score is between 40 - 60; Severely vulnerable: The comprehensive score is between 0 - 40.

[0086] Among them, by analyzing the weak links in the comprehensive score, reference suggestions can be provided for river management and treatment.

[0087] Among them, the method can adjust the evaluation indicators and weight settings according to the characteristics of different rivers to ensure the applicability and accuracy of the evaluation results.

[0088] Among them, the following modules may be included: Data acquisition module: used to acquire data related to the flood control function, navigation function, water supply function, and ecological function of the target river.

[0089] Data processing module: used to preprocess the acquired data and generate the index data required for evaluation.

[0090] Evaluation module: used to assign scores to each index based on a three-level evaluation system, calculate the index weights according to the analytic hierarchy process, and generate a comprehensive score.

[0091] Analysis module: used to divide the vulnerability level according to the comprehensive score and identify the weak links in the function.

[0092] In an exemplary embodiment, a computer device is provided. The computer device can be a server or a terminal, and its internal structure diagram can be as shown in Figure 5 . The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a method for evaluating the vulnerability of river functions.

[0093] Those skilled in the art can understand that Figure 5 the structure shown in is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0094] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0095] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program which, when executed by a processor, implements the steps in the above method embodiments.

[0096] In an exemplary embodiment, a computer program product is provided, including a computer program which, when executed by a processor, implements the steps in the above method embodiments.

[0097] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0098] Those of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above method embodiments. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0099] In each of the embodiments provided in the present application, the databases involved may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., and is not limited thereto. In each of the embodiments provided in the present application, the processor may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., and is not limited thereto.

[0100] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0101] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for evaluating the vulnerability of river functions, characterized in that, The river function vulnerability evaluation method includes: Obtaining the basic information of the river; Determining the index data for river function vulnerability evaluation; the index data includes: levee compliance rate, cross-section change rate, river regime stability, impact of water-related projects, navigation width ratio, thalweg swing amplitude, riverbed incision amplitude, water use efficiency, saltwater intrusion intensity, biodiversity, ecological water demand guarantee rate, water quality level, and biological habitat; Constructing a judgment matrix for the index data using the analytic hierarchy process; Calculating the weight vector of the index data according to the judgment matrix; Quantitatively scoring the index data based on the river basic information and the river flood control standard to obtain a scoring result; Calculating the comprehensive function score of the river according to the weight vector and the scoring result; the comprehensive function score is used to evaluate the river function vulnerability.

2. The river function vulnerability evaluation method according to claim 1, wherein The constructing of the judgment matrix for the index data using the analytic hierarchy process specifically includes: Constructing a hierarchical structure model; the hierarchical structure model includes: an objective layer, a criterion layer, and a scheme layer; the objective layer is the river function vulnerability assessment; the criterion layer includes: river flood control function data, river navigation function data, river water supply function data, and river ecological function data; the scheme layer includes: levee compliance rate, cross-section change rate, river regime stability, impact of water-related projects, navigation width ratio, thalweg swing amplitude, riverbed incision amplitude, water use efficiency, saltwater intrusion intensity, biodiversity, ecological water demand guarantee rate, water quality level, and biological habitat; Constructing the judgment matrix for the index data according to the hierarchical structure model.

3. The river function vulnerability evaluation method according to claim 1, wherein Quantitatively scoring the index data based on the river basic information and the river flood control standard to obtain a scoring result, specifically including: Based on the river basic information and the river flood control standard, dividing the index data into four parts according to function: river flood control function data, river navigation function data, river water supply function data, and river ecological function data, and conducting quantitative scoring; Among them, The scoring of the river flood control function data includes: scoring the levee compliance rate, scoring the cross-section change rate, scoring the river regime stability, and scoring the impact of water-related projects; The scoring of the river navigation function data includes: scoring the navigation width ratio and scoring the thalweg swing amplitude; The scoring of the river water supply function data includes: scoring the riverbed incision amplitude, scoring the water use efficiency, and scoring the saltwater intrusion intensity; The scoring of the river ecological function data includes: scoring the biodiversity, scoring the ecological water demand guarantee rate, scoring the water quality level, and scoring the biological habitat.

4. According to the river function vulnerability evaluation method described in claim 3, characterized in that The formula for scoring the levee compliance rate is: ； Where FHDB is the scoring result of scoring the levee compliance rate; FH is the flood control standard; CG is the levee top elevation; DBL is the compliance rate of the existing levees; The formula for scoring the cross-section change rate is: ； Among them, represents the scoring result of scoring the change rate of the cross-sectional area of flowing water; represents the length of the river reach; represents the distance between two cross-sections; represents the total number of river cross-sections, and i represents the i-th cross-section; The formula for scoring the river regime stability is: ； Where AW represents the scoring result of scoring the river regime stability; AG represents the score of the bank slope height; AJ represents the score of the bank slope substrate; KSB represents the score of the river width-depth ratio; The formula for scoring the riverbed incision amplitude is: ； Among them, is the scoring result of scoring the incision amplitude of the riverbed; θ is the average value corresponding to the evaluation year; is the average value of the deepest point in the year when obvious changes in scouring and silting occurred in the river section; The formula for assigning scores to water use efficiency is as follows: ； Among them, XL represents the comprehensive water use efficiency; TZ represents the characteristic values of each water use index; TZa represents the basin average value of each water use index.

5. The river function vulnerability evaluation method according to claim 1, characterized in that After calculating the comprehensive function score of the river according to the weight vector and the score assignment result, it further includes: Classifying the corresponding river according to the comprehensive function score; when the comprehensive function score is between 80 and 100, the corresponding river is classified as safe; when the comprehensive function score is between 60 and 80, the corresponding river is classified as relatively vulnerable; when the comprehensive function score is between 40 and 60, the corresponding river is classified as vulnerable; when the comprehensive function score is between 0 and 40, the corresponding river is classified as severely vulnerable.

6. The river function vulnerability assessment method according to claim 1, characterized in that The calculation formula for the comprehensive function score of the river basic information according to the weight vector and the score assignment result is: ； Among them, wi is the weight of the i-th index data in the weight vector, Xi is the score assigned to the i-th index data in the score assignment result, n is the total number of index data, and S is the comprehensive function score.

7. The river function vulnerability evaluation method according to claim 1, characterized in that Calculating the weight vector of the index data according to the judgment matrix specifically includes: Calculating the maximum eigenvalue of the judgment matrix to obtain the eigenvector; Using the eigenvector as the weight vector.

8. A computer device, comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the river function vulnerability evaluation method according to any one of claims 1-7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the river function vulnerability evaluation method according to any one of claims 1-7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the river function vulnerability evaluation method according to any one of claims 1-7.

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