A river function vulnerability assessment method, equipment, medium and product

Abstract

This application discloses a river functional vulnerability assessment method, equipment, medium, and product, relating to the technical fields of water conservancy projects and river ecological assessment. The method comprises: obtaining basic river information; determining indicator data for river functional vulnerability assessment; constructing a judgment matrix for the indicator data using the analytic hierarchy process (AHP); calculating a weight vector for the indicator data based on the AHP; quantifying and assigning scores to the indicator data based on the basic river information and river flood control standards to obtain a scoring result; and calculating a comprehensive functional score for the river based on the weight vector and the scoring result. The comprehensive functional score is used to assess river functional vulnerability. By introducing the AHP and a multi-indicator scoring system, this application constructs a comprehensive evaluation system for river flood control, navigation, water supply, and ecology. This system can more scientifically and comprehensively reflect river functional vulnerability and provide a reference for river management and governance.

Description

Technical Field

[0001] The present application relates to the technical field of water conservancy projects and river ecological assessment, and in particular to a method, equipment, medium and product for river function vulnerability assessment. Background Art

[0002] Rivers are vital components of ecosystems, fulfilling multiple functions, including flood control, navigation, water supply, and ecological security. They are crucial to regional socioeconomic and ecological security. However, under the dual influence of natural evolution and human activities, the fragility of river functions is becoming increasingly apparent. These include declining levee safety, siltation, poor navigation, and deteriorating water quality, severely restricting the sustainable functioning of these functions. Therefore, scientific assessments of river vulnerability are crucial for effective river management.

[0003] Existing river function evaluation methods typically focus on a single function, such as flood control or ecological function. They lack a comprehensive assessment of river functions and are unable to fully reflect the health of river functions. Furthermore, existing evaluation methods are overly simplistic in their scoring rules and fail to design reasonable quantitative standards tailored to the characteristics of different functions, resulting in inaccurate evaluation results. Summary of the Invention

[0004] The purpose of this application is to provide a river function vulnerability assessment method, equipment, medium and product, which can construct a comprehensive and integrated evaluation system and reflect the river function vulnerability in a more scientific and comprehensive manner.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a river function vulnerability assessment method, the river function vulnerability assessment method comprising:

[0007] Obtain basic river information;

[0008] Determine indicator data for river function vulnerability assessment; such indicator data include: embankment compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality, and biological habitat;

[0009] Using the analytic hierarchy process to construct a judgment matrix of the indicator data;

[0010] Calculating a weight vector of the indicator data according to the judgment matrix;

[0011] According to the basic river information and river flood control standards, the index data is quantitatively scored to obtain a scoring result;

[0012] The functional comprehensive score of the river is calculated based on the weight vector and the scoring result; the functional comprehensive score is used to evaluate the functional vulnerability of the river.

[0013] Optionally, constructing the judgment matrix of the indicator data using the analytic hierarchy process specifically includes:

[0014] A hierarchical model is constructed; the hierarchical model includes: a target layer, a criterion layer, and a scenario layer; the target layer is for 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 scenario layer includes: embankment compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality, and biological habitat;

[0015] A judgment matrix of the indicator data is constructed according to the hierarchical structure model.

[0016] Optionally, the index data is quantitatively scored based on the basic river information and river flood control standards to obtain a scoring result, specifically including:

[0017] Based on the basic river information and river flood control standards, the index data is divided into four parts according to their functions: river flood control function data, river navigation function data, river water supply function data, and river ecological function data, and quantitative scoring is performed;

[0018] in,

[0019] Scoring of the river flood control function data includes: scoring of embankment compliance rate, scoring of water section change rate, scoring of river stability, and scoring of impact of water-related projects;

[0020] The scoring of the river navigation function data includes: scoring the navigation width ratio and scoring the deep channel swing amplitude;

[0021] The scoring of the river water supply function data includes: scoring the riverbed incision amplitude, scoring the water use efficiency and scoring the salt tide intensity;

[0022] The scoring of the river ecological function data includes: scoring of biodiversity, scoring of ecological water demand guarantee rate, scoring of water quality quality and scoring of biological habitat.

[0023] Optionally,

[0024] The formula for assigning points to the embankment compliance rate is:

[0025] ;

[0026] Among them, FHDB is the scoring result of the levee compliance rate; FH is the flood control standard; CG is the levee top height; DBL is the compliance rate of the built levee;

[0027] The formula for assigning points to the water flow section change rate is:

[0028] ;

[0029] in, Indicates the scoring result of the water section change rate; Indicates the length of the river section; Indicates the distance between two sections; represents the total number of river sections, i represents the i-th section;

[0030] The formula for assigning points to river stability is:

[0031] ;

[0032] Among them, AW represents the score result of river stability; AG represents the bank slope height score; AJ represents the bank slope matrix score; KSB represents the river channel width-depth ratio score;

[0033] The formula for assigning points to the riverbed incision amplitude is:

[0034] ;

[0035] in, is the scoring result of the riverbed incision amplitude; θ is the average value corresponding to the assessment year; The average value of the deepest point in the years when erosion and deposition of the river section changed significantly;

[0036] The formula for assigning points for water use efficiency is:

[0037] ;

[0038] Among them, XL represents the comprehensive water use efficiency; TZ represents the characteristic value of each water use indicator; TZa represents the basin average value of each water use indicator.

[0039] Optionally, after calculating the comprehensive functional score of the river according to the weight vector and the scoring result, the method further includes:

[0040] The corresponding rivers will be classified into different levels according to the comprehensive functional scores; when the comprehensive functional scores are between 80-100, the corresponding rivers are classified as safe; when the comprehensive functional scores are between 60-80, the corresponding rivers are classified as relatively vulnerable; when the comprehensive functional scores are between 40-60, the corresponding rivers are classified as fragile; when the comprehensive functional scores are between 0-40, the corresponding rivers are classified as severely vulnerable.

[0041] Optionally, a calculation formula for calculating the functional comprehensive score of the river basic information according to the weight vector and the scoring result is:

[0042] ;

[0043] Among them, wi is the weight of the i-th indicator data in the weight vector, Xi is the score of the i-th indicator data in the scoring result, n is the total number of indicator data, and S is the comprehensive functional score.

[0044] Optionally, calculating the weight vector of the indicator data according to the judgment matrix specifically includes:

[0045] Calculating the maximum eigenvalue of the judgment matrix to obtain an eigenvector;

[0046] The feature vector is used as a weight vector.

[0047] In a second aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the above-described river function vulnerability assessment methods.

[0048] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-mentioned river function vulnerability assessment methods.

[0049] In a fourth aspect, the present application provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-mentioned river function vulnerability assessment methods.

[0050] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0051] This application provides a method, device, medium, and product for evaluating river functional vulnerability. The method comprises: obtaining basic river information; determining indicator data for river functional vulnerability evaluation; the indicator data including: levee compliance rate, flood section change rate, river stability, impact of water-related projects, navigation width ratio, deep-channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater intensity, biodiversity, ecological water demand guarantee rate, water quality quality, and biological habitat; constructing a judgment matrix for the indicator data using the analytic hierarchy process (AHP); calculating weight vectors for the indicator data based on the judgment matrix; quantifying and assigning scores to the indicator data based on the basic river information and river flood control standards to obtain a scoring result; and calculating a comprehensive river functional score based on the weight vector and the scoring result. The comprehensive river functional score is used to evaluate river functional vulnerability. By introducing the analytic hierarchy process (AHP) and a multi-indicator scoring system, this application constructs a comprehensive evaluation system for river flood control, navigation, water supply, and ecology. This system can more scientifically and comprehensively reflect river functional vulnerability and provide a reference for river management and governance. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 This is an application environment diagram of a river function vulnerability assessment method in one embodiment of the present application;

[0054] Figure 2 A flow chart of a river function vulnerability assessment method provided in one embodiment of the present application;

[0055] Figure 3 A schematic diagram of a hierarchical structure model provided in one embodiment of the present application;

[0056] Figure 4 A schematic diagram of calculation results provided in one embodiment of the present application;

[0057] Figure 5 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] This application conducts a scientific and comprehensive vulnerability assessment of the river's flood control function, navigation function, water supply function and ecological function through steps such as data collection, evaluation indicator selection, weight calculation and scoring, which will be used to support decision-making in river management and governance.

[0060] This application is used to comprehensively assess the health of a river's flood control, navigation, water supply, and ecological functions, identify weak links, and provide a scientific basis for river management and governance. It mainly includes the following steps:

[0061] 1. Data collection and collation: Obtain basic river information, including measured data on indicators such as embankment safety, flood control project compliance rate, navigation width ratio, deep-water swing amplitude, riverbed incision amplitude, and biodiversity.

[0062] 2. Selection of evaluation indicators and weight calculation: Based on the functional characteristics of the river, a three-level evaluation system consisting of the target layer, factor layer and indicator layer is constructed. The analytic hierarchy process (AHP) is used to calculate the weight of each indicator to ensure the rationality of weight distribution.

[0063] 3. Indicator scoring and comprehensive rating: By quantifying indicators and assigning scores, the comprehensive evaluation score of river functions is calculated based on the indicator weights, and the river vulnerability is classified into four levels: "safe", "relatively fragile", "fragile" and "severely vulnerable".

[0064] Through the above method, the present invention can comprehensively reflect the health status of river functions, solve the problems of incomplete evaluation system and unscientific weight distribution in the existing technology, and provide a basis for the rational development and protection of river functions.

[0065] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0066] The river function vulnerability assessment method provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the 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 information of the river to be processed to the server 104. After receiving the basic information of the river to be processed, the server 104 determines the indicator data for the evaluation of river function vulnerability; the indicator data include: embankment compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep-sea swing amplitude, riverbed incision amplitude, water use efficiency, salt tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality and biological habitat; use the hierarchical analysis method to construct a judgment matrix for the indicator data; calculate the weight vector of the indicator data according to the judgment matrix; according to the basic information of the river and the river flood control standard, quantify and assign points to the indicator data to obtain the scoring result; calculate the comprehensive functional score of the river according to the weight vector and the scoring result; the comprehensive functional score is used to evaluate the functional vulnerability of the river. The server 104 can feed back the obtained comprehensive functional score to the terminal 102. In addition, in some embodiments, the river functional vulnerability assessment method can also be implemented independently by the server 104 or the terminal 102. 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 a data storage system and process it.

[0067] Terminal 102 may include, but is not limited to, various desktop computers, laptops, smartphones, tablet computers, IoT devices, and portable wearable devices. IoT devices may include smart speakers, smart TVs, smart air conditioners, and smart car devices. Portable wearable devices may include smart watches, smart bracelets, and head-mounted devices. Server 104 may be implemented as a standalone server or a server cluster consisting of multiple servers, or may be a cloud server.

[0068] In an exemplary embodiment, Figure 2 As shown, a river function vulnerability assessment method is provided. The method is executed by a computer device. Specifically, it can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in the example is used as an example to illustrate the method, which includes the following steps S1 to S6.

[0069] S1. Obtain basic river information.

[0070] In this example, the following data were obtained through various channels, including field research, remote sensing images, watershed hydrological data, and engineering archives:

[0071] ① River flood control function data: levee flood control standards, levee crest height, flood control project compliance rate; width, water depth, and area of ​​flat river channels at multiple typical sections of the assessed river (including recent and historical data); nearshore bank slope height, nearshore bank slope matrix, changes in the width-to-depth ratio of typical sections, and the height of waterlogging caused by nearshore wading projects.

[0072] ② River navigation function data: evaluate the underwater topography of the river section and the swing amplitude of the deep water line.

[0073] ③ River water supply function data: the historical deepest point of the riverbed, the recent deepest point of the riverbed, the characteristic values ​​and average values ​​of the per capita comprehensive water consumption in the river basin, the water consumption per 10,000 yuan of GDP, the water consumption per 10,000 yuan of industrial added value, the actual irrigation water consumption per mu of cultivated land, the historical average annual number of saltwater intrusions, and the number of saltwater intrusions in the assessment year.

[0074] ④ River ecological function data: biodiversity assessment results, assessment of the multi-year average flow of the river section, assessment of the annual average daily flow, assessment of the annual measured water quality conditions, and assessment of changes in the area of ​​river shoals.

[0075] S2. Determine the indicator data for river function vulnerability assessment; the indicator data include: embankment compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality and biological habitat.

[0076] In this embodiment, based on the functional characteristics of the river, key evaluation indicators reflecting its flood control, navigation, water supply and ecological functions are screened to obtain indicator data.

[0077] S3. Use the hierarchical analysis method to construct a judgment matrix of the indicator data.

[0078] First, construct Figure 3 The three-level evaluation system (constructing a hierarchical model) is shown as follows: a target layer, a criterion layer, and a solution layer. The hierarchical model includes: a target layer, a criterion layer, and a solution layer. The target layer is for 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 solution layer includes: levee compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality, and biological habitat. A judgment matrix for the indicator data is then constructed based on the hierarchical model.

[0079] S4. Calculate the weight vector of the indicator data according to the judgment matrix.

[0080] Specifically, the Analytic Hierarchy Process (AHP) was used to construct a judgment matrix, and the weight of each indicator was calculated through consistency testing. The core of the AHP is the construction of the judgment matrix, which comprehensively compares the importance of each indicator. The river function evaluation index system includes four evaluation indicators: flood control, navigation, water supply, and ecology. Flood control assessments require consideration of embankments, flood discharge, and waterlogging; waterway assessments require consideration of channel dimensions and stability; and water supply and ecology assessments require consideration of water levels, organisms, and water quality. Figure 3 This example shows an example of using the analytic hierarchy process to construct a weight calculation matrix for a river function vulnerability assessment system. (The weights are recommended for assessing the function vulnerability of a large river at its estuary; when using this example, they should be adjusted accordingly based on the actual assessment of the river.)

[0081] The process of constructing the judgment matrix using the Analytic Hierarchy Process (AHP) in this embodiment is as follows:

[0082] 1. Build a hierarchical model: First, define the decision problem and decompose it into the goal layer, the criteria layer, and the solution layer. The goal layer is the ultimate goal of the decision, the criteria layer includes the various factors that influence the decision, and the solution layer is the available options or strategies.

[0083] 2. Construct a Judgment Matrix: At the criterion level, decision makers need to compare criteria pairwise based on their relative importance and assign quantitative judgment values ​​using a 1-9 scale. These values ​​form a judgment matrix. For example, if criterion A is slightly more important than criterion B, enter 3 in the corresponding matrix position; otherwise, enter 1 / 3.

[0084] The steps for constructing a judgment matrix are as follows: ensure that all elements are at the same level for comparison; take into account that different elements may have different evaluation criteria compared with different aspects; use one-to-one pairing or random pairing to avoid subjective bias.

[0085] 3. Consistency Check: 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 and is related to the matrix order. Generally, a CR value less than 0.1 indicates that the consistency of the judgment matrix is ​​acceptable.

[0086] 4. Calculate the weight vector: Obtain the weight vector by solving the maximum eigenvalue and corresponding eigenvector of the judgment matrix. The weight represents the importance of each factor in achieving the goal.

[0087] S5. Based on the basic river information and river flood control standards, the indicator data is quantitatively scored to obtain a scoring result.

[0088] In this embodiment, based on the basic river information and river flood control standards, the indicator data is divided into four parts according to their functions: river flood control function data, river navigation function data, river water supply function data, and river ecological function data, and quantitative scoring is performed. It should be noted that in this embodiment, the scoring is performed based on the basic river information collected above.

[0089] (1) The scoring of the river flood control function data (river flood (tide) scoring standards) includes:

[0090] ① Assign points to the embankment compliance rate:

[0091] According to the flood control standards of levees, superelevation of levees and project compliance rate, the formula is used for calculation:

[0092] ;

[0093] Where FHDB is the score for the compliance rate of river flood control projects; FH is the flood control standard; CG is the levee crest height, in meters; DBL is the compliance rate of built levees, DBL = RDA / RD*100, where RDA is the length of river levees that meet the flood control standards, and RD is the total length of river levees.

[0094] The following table shows examples of scoring for each indicator (this scoring table is a recommended value for scoring the embankment at the mouth of a large river. When using this scoring table, it should be adjusted accordingly based on the actual evaluation of the river):

[0095] Table 1 Flood (tide) control project compliance rate scoring table (example)

[0096]

[0097] ② Assign points to the water section change rate:

[0098] The characteristic value of the cross-sectional area of ​​water flow is calculated using the river section scale flat river channel area calculation method. This method calculates the logarithmic geometric mean of the characteristic values ​​of the flat river channel of multiple sections within the river section to obtain the average morphological parameters that are representative of the characteristic value of the entire river section. The specific formula is as follows:

[0099] ;

[0100] Where, It represents the scoring result of the water section change rate, which can also represent the river channel width at the river section scale ( ), water depth ( ),area( ) (The scoring result can also represent these three); Indicates the length of the river section; Indicates the distance between two sections; Represents the total number of river sections, and i represents the i-th section.

[0101] The area increase ratio is scored by comparing the characteristic value calculated in the assessment year with the baseline value in a typical year. The characteristic cross-sectional area ratio is scored by comparing the characteristic value calculated in the assessment year to the minimum cross-sectional area within the river reach. An example scoring table is shown in Table 2. (This scoring table provides recommended values ​​for the change rate of cross-sectional flow at the estuary of a major river. When using this scoring table, adjustments should be made based on the actual river conditions being evaluated.)

[0102] Table 2 Water section change rate scoring table

[0103]

[0104] ③ Assigning points to river stability:

[0105] From the perspective of assessment difficulty, river stability is primarily assessed based on bank height, bank base, and channel width-to-depth ratio. For simple sections, bank height is determined based on the left and right bank edges; for complex sections, the first slope adjacent to the left and right bank edges is considered. The overall stability score for a river section is calculated based on the average of multiple sections.

[0106] ;

[0107] Where AW represents the bank stability index score; AG represents the bank height score; AJ represents the bank matrix score; and KSB represents the channel width-depth ratio score. An example of a scoring table is shown in Table 3. (This table provides recommended values ​​for the stability of a major river estuary. When using this table, adjustments should be made based on the actual river conditions.)

[0108] Table 3 River stability scoring table

[0109]

[0110] ④ Points for impact on water-related projects:

[0111] Consider the impact of port and wharf projects, water intake and drainage projects, and tidal flat development and utilization projects on flood control. Scores are determined based on the baseline water level and the magnitude of waterlogging in the assessed year. Furthermore, the results are adjusted to account for the impact of nearshore scour on project stability. An example scoring table is shown in Table 4. (This table provides recommended scoring values ​​for water-related projects at the estuary of a major river. When using this table, adjustments should be made based on the actual river conditions.)

[0112] Table 4 Impact scoring table for water-related projects

[0113]

[0114] (2) The scoring of the river navigation function data (river navigation scoring standards) includes:

[0115] ① Assigning points to the width ratio:

[0116] Channel depth is a fundamental requirement for navigation. It primarily limits a ship's tonnage and capacity, and is a key factor in selecting a vessel's draft and deadweight. Channel depth is determined by the minimum water depth along the channel and is affected by factors such as shoals. Channel width refers to the horizontal distance between the two boundary lines, measured perpendicular to the channel's centerline.

[0117] Based on measured topographic data for the river section to be assessed, a depth map can be constructed for the section under typical navigation depth conditions, and the minimum section ratio at typical depth can be calculated. Scoring is then determined by comprehensively considering the minimum channel width ratio and the navigable conditions. An example scoring table is shown in Table 5. (This scoring table provides recommended values ​​for the channel width ratio at the estuary of a major river and should be adjusted based on the actual river conditions being assessed.)

[0118] Table 5 Width Ratio Scoring Table

[0119]

[0120] ② Assign points to the amplitude of deep-sea swing:

[0121] The fluctuation of deep gullies reflects changes in the mainstream, influencing the erosion and deposition trends of deep channels and, in turn, the stability of the waterway. The lateral fluctuation of deep gullies in the assessment year is compared with that in the previous period. The ratio of the average distance of deep gullies from shore within a river section to the multi-year average is used as the evaluation criterion for deep gully fluctuation. An example of a scoring table is shown in Table 6. (This scoring table provides recommended values ​​for deep gully fluctuation at the estuary of a major river. When using this scoring table, it should be adjusted according to the actual river conditions.)

[0122] Table 6 Deep Swing Amplitude Scoring Table

[0123]

[0124] (3) The scoring of the river water supply function data (river water supply scoring standards) includes:

[0125] ① Assign points to the extent of riverbed incision:

[0126] With reference to the concept of river scale average, the historical deepest point and recent deepest point data of each typical section of the river are collected, and the change range of the average value of the deepest point of the typical section is calculated to represent the riverbed depth of the assessed section. The average value of the deepest point in the year when the scouring and sedimentation of the river section changed significantly is used as the characteristic value. (m), assigned 80 points, the average value corresponding to the evaluation year is θ (m), and the index is assigned , Assign points to the riverbed incision amplitude indicator.

[0127] ② Assign points to water use efficiency:

[0128] A comprehensive water use efficiency assessment is adopted, with the per capita comprehensive water consumption in the basin where the assessment area is located, the water consumption per 10,000 yuan of GDP, the water consumption per 10,000 yuan of industrial added value, and the actual irrigation water consumption per mu of cultivated land as characteristic values, and the ratio of the corresponding characteristic value of the assessment area to the basin average value is calculated.

[0129] ;

[0130] Among them, XL represents the comprehensive water use efficiency; TZ represents the characteristic value of each water use indicator; TZa represents the basin average value of each water use indicator.

[0131] ③ Assign points to the intensity of saltwater tides (rivers in tidal zones):

[0132] Saltwater intrusion only occurs in rivers in the tidal zone; inland rivers do not need to be considered for this indicator. A preliminary range is defined based on the degree of harm caused by saltwater intrusion in that year. The average annual number of saltwater intrusions is used as the baseline value, and corrections are made based on the ratio of the change in the number of assessment years to the average number of intrusions. The scoring table is shown in Table 7:

[0133] Table 7 Salt tide intensity scoring table

[0134]

[0135] (4) The scoring of the river ecological function data (river ecological scoring standards) includes:

[0136] ① Assigning points to biodiversity:

[0137] Biodiversity assessment indicators are assessed qualitatively, taking into account the structure and composition of biomes and the number of species, drawing on research findings, survey reports, and relevant project materials from the year of assessment. Overall, the river's plant and animal diversity is assessed using five levels: abundant, relatively abundant, average, few, and absent. The scoring table is shown in Table 8:

[0138] Table 8 Biodiversity scoring table

[0139]

[0140] ② Assign points to the ecological water demand guarantee rate:

[0141] To calculate 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 to the multi-year average flow of the corresponding period, and take the lower value of the two. The scoring table is shown in Table 9:

[0142] Table 9 Ecological water demand guarantee rate scoring table

[0143]

[0144] ③ Assign points to the quality of water:

[0145] Points are assigned based on the proportion of river water quality categories. The proportion of water quality categories follows the "Surface Water Environmental Quality Standards". In actual assessments, points are determined based on the measured water quality conditions and proportions in the assessment year. The scoring table is shown in Table 10:

[0146] Table 10 Water quality scoring table

[0147]

[0148] ④ Assign points to biological habitats:

[0149] Habitat suitability is assessed based on the magnitude of change in beach area. The overall erosion and deposition change rate of a beach is calculated using σ = ΔS / S, where ΔS is the difference in beach area between two statistical measurements and S is the average of the two statistical measurements. For multiple beaches, the area change rate is adjusted based on the ratio of each beach area to the total beach area. The scoring table is shown in Table 11.

[0150]

[0151] S6. Calculate the comprehensive functional score of the river based on the weight vector and the scoring result; the comprehensive functional score is used to evaluate the functional vulnerability of the river.

[0152] In this embodiment, the scores of each indicator are summarized according to the weights to calculate the comprehensive function score. The calculation formula is:

[0153] ;

[0154] Among them, wi is the weight of the i-th indicator data in the weight vector, Xi is the score of the i-th indicator data in the scoring result, n is the total number of indicator data, and S is the comprehensive score of the function. The final calculation result is as follows Figure 4 shown.

[0155] The functional composite score is used to grade vulnerability, which is divided into safe (80-100), relatively vulnerable (60-80), fragile (40-60) and severely vulnerable (0-40).

[0156] This embodiment relates to a river functional vulnerability assessment method, comprising the following steps: data collection and organization; selection of evaluation indicators, including the four river functions of flood control, navigation, water supply, and ecology, and their related indicators; calculation of indicator weights using the analytic hierarchy process; assignment of scores to the indicators based on quantitative standards and measured data, and calculation of comprehensive scores based on the weights; classification of vulnerability levels based on the comprehensive scores, and analysis of functional weaknesses. This method comprehensively considers multiple river functions, including flood control, navigation, water supply, and ecology. Through a scientifically sound evaluation indicator system and scoring criteria, it can accurately assess the vulnerability of river functions, providing a scientific, comprehensive, and accurate basis for river management and regulation, and possesses significant practical application value.

[0157] In another exemplary embodiment, a method for assessing river function vulnerability is provided, comprising the following steps:

[0158] 1) Data collection and organization: Obtain basic information on the target river and data required for evaluation, including flood control function data, navigation function data, water supply function data, and ecological function data.

[0159] 2) Evaluation index selection and weight calculation: A three-level evaluation system is constructed based on the functional characteristics of the river, including the target layer, factor layer and indicator layer, and the weight of each indicator is calculated using the analytic hierarchy process (AHP).

[0160] 3) Indicator scoring and comprehensive evaluation: Quantify the indicators and assign points to each indicator according to the scoring criteria, and calculate the comprehensive score of river functions based on the weight of each indicator.

[0161] 4) Vulnerability classification: Based on the comprehensive score, the vulnerability of river functions is divided into four levels: safe, relatively vulnerable, fragile and severely vulnerable.

[0162] 5) Functional Weakness Analysis: Identify weak links that affect river functions based on vulnerability levels and provide corresponding management recommendations.

[0163] The data collection and collation in step 1) includes obtaining data through various means such as field research, remote sensing images, hydrological data and engineering archives.

[0164] The step 2) wherein the weight calculation using the analytic hierarchy process includes constructing a judgment matrix, performing consistency testing, and weight calculation.

[0165] Among them, the scoring in step 3) is designed based on quantitative standards for different functional characteristics, including scoring standards for river flood control function; scoring standards for river navigation function; scoring standards for river water supply function; and scoring standards for river ecological function.

[0166] Among them, the scoring standards for river flood control functions include scoring the embankment compliance rate, the change rate of the water-passing section, the stability of the river flow and the impact of water-related projects.

[0167] Among them, the scoring standards for river navigation functions include scoring the navigation width ratio and the depth swing amplitude.

[0168] Among them, the scoring standards for river water supply functions include scoring the extent of riverbed incision, water use efficiency and salt tide intensity (inland rivers do not need to be considered).

[0169] Among them, the river ecological function scoring standards include scoring for biodiversity, ecological water demand guarantee rate, water quality and changes in biological habitats.

[0170] The vulnerability grading in step 4) is divided into the following four levels according to the comprehensive score: safe: comprehensive score between 80-100; relatively vulnerable: comprehensive score between 60-80; fragile: comprehensive score between 40-60; severely vulnerable: comprehensive score between 0-40.

[0171] Among them, by analyzing the functional weaknesses in the comprehensive score, reference suggestions can be provided for river management and governance.

[0172] 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.

[0173] The following modules may be included:

[0174] Data collection module: used to collect data related to the flood control function, navigation function, water supply function and ecological function of the target river.

[0175] Data processing module: used to preprocess the collected data and generate indicator data required for evaluation.

[0176] Evaluation module: used to assign scores to each indicator based on the three-level evaluation system, calculate the indicator weights according to the hierarchical analysis method, and generate a comprehensive score.

[0177] Analysis module: used to classify vulnerability levels based on comprehensive scores and identify functional weaknesses.

[0178] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 5As shown. The computer device includes a processor, a memory, an input / output interface (I / O) and a communication interface. The processor, memory and input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. 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 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 an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for assessing river functional vulnerability is implemented.

[0179] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure 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 shown in the figure, or combine certain components, or have a different component arrangement.

[0180] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0181] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0182] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0183] 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 used 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 must comply with relevant regulations.

[0184] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the 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-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. 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), magnetic 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 may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0185] The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may include, but are not limited to, general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic units, data processing logic units based on quantum computing, and the like.

[0186] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0187] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A river function vulnerability assessment method, characterized in that: The river function vulnerability assessment method includes: Obtain basic river information; the basic river information includes river flood control function data; the river flood control function data includes: levee flood control standards, levee crest height, and flood control project compliance rate; assess the width, water depth, and area of ​​the flat river channel in multiple typical sections of the river; the nearshore bank slope height, nearshore bank slope matrix, changes in the width-to-depth ratio of typical sections, and the height of waterlogging caused by nearshore wading projects; Determine indicator data for river function vulnerability assessment; such indicator data include: embankment compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality, and biological habitat; Using the analytic hierarchy process to construct a judgment matrix of the indicator data; Calculating a weight vector of the indicator data according to the judgment matrix; According to the basic river information and river flood control standards, the index data is quantitatively scored to obtain a scoring result; Calculating a comprehensive functional score of the river based on the weight vector and the scoring result; the comprehensive functional score is used to evaluate the functional vulnerability of the river; Based on the basic river information and river flood control standards, the index data is quantitatively scored to obtain the scoring results, which specifically include: Based on the basic river information and river flood control standards, the index data is divided into four parts according to their functions: river flood control function data, river navigation function data, river water supply function data, and river ecological function data, and quantitative scoring is performed; in, Scoring of the river flood control function data includes: scoring of embankment compliance rate, scoring of water section change rate, scoring of river stability, and scoring of impact of water-related projects; The scoring of the river navigation function data includes: scoring the navigation width ratio and scoring the deep channel 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 salt tide intensity; The scoring of the river ecological function data includes: scoring of biodiversity, scoring of ecological water demand guarantee rate, scoring of water quality and scoring of biological habitat; The formula for assigning points to the embankment compliance rate is: ； Among them, FHDB is the scoring result of the levee compliance rate; FH is the flood control standard; CG is the levee top height; DBL is the compliance rate of the built levee; The formula for assigning points to the water flow section change rate is: ； in, Indicates the scoring result of the water section change rate; Indicates the length of the river section; Indicates the distance between two sections; represents the total number of river sections, i represents the i-th section; The formula for assigning points to river stability is: ； Among them, AW represents the score result of river stability; AG represents the bank slope height score; AJ represents the bank slope matrix score; KSB represents the river channel width-depth ratio score; The formula for assigning points to the riverbed incision amplitude is: ； in, is the scoring result of the riverbed incision amplitude; θ is the average value corresponding to the assessment year; The average value of the deepest point in the years when erosion and deposition of the river section changed significantly; The formula for assigning points for water use efficiency is: ； Among them, XL represents comprehensive water use efficiency; TZ represents the characteristic value of each water use index; TZa represents the basin average value of each water use index; The calculation formula for calculating the functional comprehensive score of the river basic information based on the weight vector and the scoring result is: ； Among them, wi is the weight of the i-th indicator data in the weight vector, Xi is the score of the i-th indicator data in the scoring result, n is the total number of indicator data, and S is the comprehensive functional score.

2. The river function vulnerability assessment method according to claim 1, characterized in that: The method of constructing the judgment matrix of the indicator data by using the hierarchical analysis method specifically includes: A hierarchical model is constructed; the hierarchical model includes: a target layer, a criterion layer, and a scenario layer; the target layer is for 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 scenario layer includes: embankment compliance rate, water section change rate, river stability, impact of water-related projects, navigation width ratio, deep channel swing amplitude, riverbed incision amplitude, water use efficiency, saltwater tide intensity, biodiversity, ecological water demand guarantee rate, water quality quality, and biological habitat; A judgment matrix of the indicator data is constructed according to the hierarchical structure model.

3. The river function vulnerability assessment method according to claim 1, characterized in that: After calculating the comprehensive score of river functions according to the weight vector and the scoring result, the method further includes: The corresponding rivers will be classified into different levels according to the comprehensive functional scores; when the comprehensive functional scores are between 80-100, the corresponding rivers are classified as safe; when the comprehensive functional scores are between 60-80, the corresponding rivers are classified as relatively vulnerable; when the comprehensive functional scores are between 40-60, the corresponding rivers are classified as fragile; when the comprehensive functional scores are between 0-40, the corresponding rivers are classified as severely vulnerable.

4. The river function vulnerability assessment method according to claim 1, characterized in that: Calculating the weight vector of the indicator data according to the judgment matrix specifically includes: Calculating the maximum eigenvalue of the judgment matrix to obtain an eigenvector; The feature vector is used as a weight vector.

5. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the river function vulnerability assessment method according to any one of claims 1 to 4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the river function vulnerability assessment method according to any one of claims 1 to 4 is implemented.

7. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the river function vulnerability assessment method according to any one of claims 1 to 4 is implemented.

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