Urban blue-green infrastructure storage and drainage capacity evaluation method, device, equipment and medium

Abstract

The invention provides an urban blue-green infrastructure storage and drainage capability evaluation method, device, equipment and medium, and relates to the technical field of regulation and storage evaluation, and the method comprises the steps: constructing an urban blue-green infrastructure storage and drainage capability evaluation index system; the index system comprises a plurality of dimensions; the dimensions comprise a spatial pattern dimension, a safe operation dimension, a management and control support dimension and a storage and drainage effect dimension; screening evaluation indexes based on the evaluation index system and determining weights of the evaluation indexes; determining each first evaluation index value in the target area based on the evaluation index and the weight; performing three-level drainage partition division on the urban area, and determining a second evaluation index value on the drainage partition scale based on the first evaluation index value; and evaluating the storage and drainage capacity of the urban blue-green infrastructure based on the second evaluation index value. In the mode, the evaluation system is perfected, the evaluation dimension is increased, and the evaluation accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of regulation and evaluation, and in particular, to a method, device, equipment and medium for evaluating the storage and drainage capacity of urban blue-green infrastructure. Background Art

[0002] Urban waterlogging disasters have become prominent problems affecting urban public safety in China and are also important factors restricting the economic and social development of China. Under the dual effects of global climate change and the advancement of urbanization, the risk of urban waterlogging disasters is increasing day by day, bringing new challenges to cities in dealing with flood disasters. Managing urban waterlogging is related to the safety of people's lives and property and is the specific content of coordinating development and security and an important measure to achieve high-quality development. Blue-green infrastructure is an important part of the urban ecosystem and plays an important role in the absorption, storage and slow release of rainwater. How to rationally layout and make full use of blue-green infrastructure has become a hot spot and key point in urban stormwater management research.

[0003] With the change of the urban waterlogging management concept in China, the functional orientation of urban blue-green infrastructure has also changed accordingly. At the same time, the continuous promotion of the construction of sponge cities and resilient cities has put forward new requirements for the urban blue-green-gray system to deal with waterlogging disasters. Therefore, scientifically and systematically evaluating the storage and drainage capacity of urban blue-green infrastructure is an important prerequisite for rationally layout and making full use of blue-green infrastructure. However, at present, the evaluation system for the storage and drainage capacity of urban blue-green infrastructure is still imperfect, and there are still problems such as single evaluation dimensions and indicators and relatively large evaluation scales. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method, device, equipment and medium for evaluating the storage and drainage capacity of urban blue-green infrastructure, which improves the evaluation system, increases the evaluation dimensions, and improves the average accuracy.

[0005] In a first aspect, an embodiment of the present invention provides a method for evaluating the storage and drainage capacity of urban blue-green infrastructure, including: constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure; the index system includes multiple dimensions; the dimensions include: spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension; screening evaluation indicators based on the evaluation index system and determining the weights of the evaluation indicators; determining the values of each first evaluation indicator in the target area based on the evaluation indicators and weights; dividing the urban area into three-level drainage sub-areas, and determining the values of the second evaluation indicators at the drainage sub-area scale based on the values of the first evaluation indicators; evaluating the storage and drainage capacity of urban blue-green infrastructure based on the values of the second evaluation indicators.

[0006] In a preferred embodiment of the present invention, the construction of the evaluation index system for the storage and drainage capacity of urban blue-green infrastructure includes: generating an initial evaluation index set based on pre-determined construction requirements; screening to obtain the final evaluation index through correlation analysis based on the initial evaluation index set; dividing into the spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension based on the final evaluation index; and constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure based on the spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension.

[0007] In a preferred embodiment of the present invention, the screening of evaluation indexes and determination of the weights of evaluation indexes based on the evaluation index system include: selecting the river and lake water surface rate, green space rate, green space aggregation index, and green space fragmentation index from the initial evaluation index set as the evaluation indexes for the spatial pattern dimension; selecting the flood control dike compliance rate and the compliance rate of the backbone drainage channel from the initial evaluation index set as the evaluation indexes for the safe operation dimension; selecting the ecological shoreline ratio and the proportion meeting the sponge city construction standard from the initial evaluation index set as the evaluation indexes for the management and control support dimension; selecting the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree from the initial evaluation index set as the evaluation indexes for the storage and drainage effect dimension; and using the analytic hierarchy process and the entropy weight method to determine the weights of each evaluation index.

[0008] In a preferred embodiment of the present invention, the above first evaluation index values include: the river and lake water surface rate, green space rate, green space aggregation index, and green space fragmentation index, the flood control dike compliance rate, the compliance rate of the backbone drainage channel, the ecological shoreline ratio, and the proportion meeting the sponge city construction standard, the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree; determining the values of each first evaluation index in the target area based on the evaluation index and the weight, including: calculating the river and lake water surface rate, green space rate, green space aggregation index, and green space fragmentation index based on the evaluation indexes of the spatial pattern dimension using ArcGIS and Fragstats; calculating the flood control dike compliance rate, the compliance rate of the backbone drainage channel, the ecological shoreline ratio, and the proportion meeting the sponge city construction standard using mathematical statistics methods based on the evaluation indexes of the safe operation dimension and the management and control support dimension; calculating the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree by combining ArcGIS and the urban rain flood model based on the evaluation indexes of the storage and drainage effect dimension.

[0009] In a preferred embodiment of the present invention, the above evaluation indicators based on the storage and drainage effect dimension, in combination with ArcGIS and urban stormwater models, calculate the proportion of green spaces with rainwater storage function, the degree of backwater of urban inland rivers on the drainage network, and the blue-green integration degree, including: based on the drainage network and terrain data of the target area, establishing SWMM model and LISFLOOD-FP model, and coupling the models to obtain a coupled model; based on the coupled model, simulating the river water level and surface water accumulation under the rainfall design return period to obtain simulation results; based on the simulation results, calculating the proportion of green spaces with rainwater storage function, the degree of backwater of urban inland rivers on the drainage network, and the blue-green integration degree.

[0010] In a preferred embodiment of the present invention, the above three-level drainage zoning of the urban area includes: based on natural geographical conditions, using the ArcGIS hydrological analysis method to divide the first-level natural catchment area; based on the first-level natural catchment area, combining the flow direction of the planned rainwater pipe network, the position of the drainage outlet, and the road boundary, correcting the first-level catchment area and dividing the second-level drainage zoning; based on the second-level drainage zoning, combining the secondary and branch pipe networks and historical waterlogging point data, dividing the third-level drainage zoning.

[0011] In a preferred embodiment of the present invention, evaluating the storage and drainage capacity of urban blue-green infrastructure based on the second evaluation index value includes: using the natural breakpoint method to classify the evaluation index based on the second evaluation index value, determining the evaluation grade classification boundary and classification standard of the evaluation index; obtaining the evaluation value of each dimension based on each weight; calculating the comprehensive evaluation score of the storage and drainage capacity of urban blue-green infrastructure based on the weights of each dimension to evaluate the storage and drainage capacity of urban blue-green infrastructure.

[0012] In a second aspect, an embodiment of the present invention further provides an evaluation device for the storage and drainage capacity of urban blue-green infrastructure, including: an evaluation index system construction module for constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure; the index system includes multiple dimensions; the dimensions include: spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension; an evaluation index screening module for screening evaluation indexes based on the evaluation index system and determining the weights of the evaluation indexes; a first evaluation index value determination module for determining the first evaluation index values in the target area based on the evaluation indexes and weights; a second evaluation index value determination module for performing three-level drainage zoning of the urban area and determining the second evaluation index values at the drainage zoning scale based on the first evaluation index values; a storage and drainage capacity evaluation module for evaluating the storage and drainage capacity of urban blue-green infrastructure based on the second evaluation index values.

[0013] In a third aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the above-mentioned method for evaluating the storage and drainage capacity of urban blue-green infrastructure in the first aspect.

[0014] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions, which, when called and executed by a processor, cause the processor to implement the method for evaluating the water storage and drainage capacity of urban blue-green infrastructure in the first aspect above.

[0015] The embodiments of the present invention bring the following beneficial effects: The embodiments of the present invention provide a method, device, equipment and medium for evaluating the water storage and drainage capacity of urban blue-green infrastructure. By constructing an evaluation index system for the water storage and drainage capacity of urban blue-green infrastructure, the index system includes multiple dimensions, and the dimensions include: spatial pattern dimension, safe operation dimension, management and control support dimension, and water storage and drainage effect dimension. Based on the evaluation index system, evaluation indexes are screened and the weights of the evaluation indexes are determined. Based on the evaluation indexes and weights, the values of each first evaluation index in the target area are determined. The urban area is divided into three-level drainage sub-areas, and based on the values of the first evaluation index, the values of the second evaluation index at the scale of the drainage sub-area are determined. Based on the values of the second evaluation index, the water storage and drainage capacity of urban blue-green infrastructure is evaluated. In this way, the evaluation system is improved, the evaluation dimensions are increased, and the evaluation accuracy is improved.

[0016] Other features and advantages of the present disclosure will be described in the following specification, or some features and advantages can be inferred from the specification or determined without doubt, or can be known by implementing the above technologies of the present disclosure.

[0017] To make the above objects, features and advantages of the present disclosure more obvious and understandable, the following specific preferred embodiments are given below, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a flowchart of a method for evaluating the water storage and drainage capacity of urban blue-green infrastructure provided by an embodiment of the present invention; Figure 2 It is a flowchart of another method for evaluating the water storage and drainage capacity of urban blue-green infrastructure provided by an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a device for evaluating the water storage and drainage capacity of urban blue-green infrastructure provided by an embodiment of the present invention; Figure 4 A schematic structural diagram of an electronic device provided by an embodiment of the present invention. Specific implementation manners

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Urban waterlogging disasters have become prominent problems affecting urban public safety in China and important factors restricting the economic and social development of China. Under the dual effects of global climate change and the advancement of urbanization, the risk of urban waterlogging disasters is increasing day by day, bringing new challenges to cities in dealing with flood disasters. Managing urban waterlogging is related to the safety of people's lives and property and is the specific content of coordinating development and safety and an important measure to achieve high-quality development. Blue-green infrastructure is an important part of the urban ecosystem and plays an important role in the absorption, storage, and slow release of rainwater. How to rationally layout and make full use of blue-green infrastructure has become a hot topic and key point in urban stormwater management research.

[0022] With the change of the ideas for managing urban waterlogging in China, the functional positioning of urban blue-green infrastructure has also changed accordingly. At the same time, the continuous promotion of the construction of sponge cities and resilient cities has put forward new requirements for the urban blue-green-gray system to deal with waterlogging disasters. Therefore, scientifically and systematically evaluating the storage and drainage capacity of urban blue-green infrastructure is an important prerequisite for rationally laying out and making full use of blue-green infrastructure. However, the current evaluation system for the storage and drainage capacity of urban blue-green infrastructure is still imperfect, and there are still problems such as single evaluation dimensions and indicators and relatively large evaluation scales.

[0023] Based on this, a method, device, equipment, and medium for evaluating the storage and drainage capacity of urban blue-green infrastructure provided by the embodiments of the present invention can construct an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure. The index system includes multiple dimensions, and the dimensions include: spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension. Screen evaluation indicators based on the evaluation index system and determine the weights of the evaluation indicators. Determine the values of each first evaluation indicator in the target area based on the evaluation indicators and weights. Divide the urban area into three-level drainage sub-areas, and determine the values of the second evaluation indicators at the scale of the drainage sub-areas based on the values of the first evaluation indicators. Evaluate the storage and drainage capacity of urban blue-green infrastructure based on the values of the second evaluation indicators. In this way, the evaluation system is improved, the evaluation dimensions are increased, and the accuracy of the evaluation is improved.

[0024] To facilitate the understanding of this embodiment, a method for evaluating the storage and drainage capacity of urban blue-green infrastructure disclosed in the embodiments of the present invention will be introduced in detail first.

[0025] Embodiment 1 The embodiment of the present invention provides a method for evaluating the storage and drainage capacity of urban blue-green infrastructure. Figure 1 It is a flowchart of a method for evaluating the storage and drainage capacity of urban blue-green infrastructure provided by the embodiment of the present invention. As Figure 1 shown, the method for evaluating the storage and drainage capacity of urban blue-green infrastructure may include the following steps: Step S101, construct an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure.

[0026] Among them, the index system includes multiple dimensions; the dimensions include: spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension.

[0027] Among them, the feature is the spatial pattern, which reflects the natural endowment of urban blue-green infrastructure and embodies the ability of blue-green infrastructure itself to store and discharge rainwater; operation and maintenance is the safe operation, which reflects the operation of the water conservancy projects associated with urban blue-green infrastructure and embodies the support degree of water conservancy projects for giving full play to the storage and drainage capacity of blue-green infrastructure; management and control is the management and control support, which reflects the implementation of the protection and management and control of urban blue-green infrastructure and embodies the guarantee degree of the storage and drainage capacity of urban blue-green infrastructure; the effect is the storage and drainage effect, which reflects the actual storage and drainage situation of urban blue-green infrastructure and embodies the regulation degree of urban blue-green infrastructure on rainwater (rainstorm).

[0028] Specifically, constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure may include: generating an initial evaluation index set based on pre-determined construction requirements; screening to obtain the final evaluation indexes through correlation analysis based on the initial evaluation index set; dividing into the spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension based on the final evaluation indexes; constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure based on the spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension.

[0029] Among them, relevant documents such as urban waterlogging treatment, blue-green infrastructure planning, and rainwater management can be collected according to the construction requirements of sponge cities and resilient cities, and combined with the actual situation, indexes with a higher frequency of use can be proposed or selected to generate an evaluation index set.

[0030] Among them, the final evaluation index system can be obtained by applying correlation analysis method and expert consultation method in accordance with the principles of comprehensiveness, operability, independence, and quantifiability.

[0031] Step S102, screen evaluation indexes based on the evaluation index system and determine the weights of the evaluation indexes.

[0032] Specifically, screening evaluation indicators based on the evaluation index system and determining the weights of the evaluation indicators may include: selecting the river-lake water surface rate, green space rate, green space aggregation index, and green space fragmentation index from the initial evaluation index set as the evaluation indicators for the spatial pattern dimension; selecting the flood control dike compliance rate and the backbone drainage channel compliance rate from the initial evaluation index set as the evaluation indicators for the safe operation dimension; selecting the ecological shoreline ratio and the proportion meeting the sponge city construction standard from the initial evaluation index set as the evaluation indicators for the management and control support dimension; selecting the proportion of green space with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the blue-green integration degree from the initial evaluation index set as the evaluation indicators for the storage and drainage effect dimension; and using the analytic hierarchy process and the entropy weight method to determine the weights of each evaluation indicator.

[0033] For ease of understanding, Table 1 shows the construction of the evaluation indicators for the storage and drainage capacity of urban blue-green infrastructure.

[0034] Table 1:

[0035] (1) Goal layer The goal layer is a single goal, that is, the overall goal of the storage and drainage capacity of urban blue-green infrastructure, which reflects the comprehensive storage and drainage capacity of urban blue-green infrastructure. The purpose of evaluating the storage and drainage capacity of blue-green infrastructure is to systematically evaluate the true storage and drainage state of urban blue-green infrastructure for rainwater by integrating the characteristics, operation level, management level, and regulation effectiveness of regional blue-green infrastructure.

[0036] (2) Criterion layer The criterion layer is an organic part of the goal layer, that is, it represents the dimensions and is divided into 4 aspects: 1) Spatial pattern, which reflects the natural endowment of urban blue-green infrastructure and embodies the rainwater storage and discharge capacity of blue-green infrastructure itself.

[0037] 2) Safe operation, which reflects the operation of the water conservancy projects associated with urban blue-green infrastructure and embodies the support degree of water conservancy projects for giving full play to the storage and drainage capacity of blue-green infrastructure.

[0038] 3) Storage and drainage effect, which reflects the actual storage and drainage situation of urban blue-green infrastructure and embodies the regulation degree of urban blue-green infrastructure for rainwater (rainstorm).

[0039] 4) Management and control support, which reflects the implementation of the protection and management and control of urban blue-green infrastructure and embodies the guarantee degree for the storage and drainage capacity of urban blue-green infrastructure.

[0040] (3) Index layer The specific meanings and calculation formulas of the evaluation indicators for the storage and drainage capacity of each urban blue-green infrastructure are as follows: ① Water surface ratio of rivers and lakes: The percentage of the area of rivers and lakes in a region to the area of that region.

[0041]

[0042] Among them, WSR is the water surface ratio of rivers and lakes (%); SW is the area of rivers and lakes (km 2 ); ST is the area of the region (km 2 ).

[0043] ② Green space rate: The percentage of the green space area in a region to the area of that region.

[0044]

[0045] Among them, GR is the green space rate (%); S G is the green space area (km 2 ); S T is the area of the region (km 2 ).

[0046] ③ Green space aggregation index (COHESION): Reflects the degree of patch aggregation of the same landscape type. The higher the value, the higher the internal cohesion of the patch.

[0047]

[0048] Among them, P ij is the perimeter of the green space patch ij in pixel mode; a ij is the area of the green space patch ij in pixel mode; Z is the total number of pixels in the landscape; n is the total number of green space patches.

[0049] ④ Green space fragmentation (DIVISION): Reflects the degree of patch dispersion of the same landscape type. When its value is equal to 0, the landscape type is composed of a single patch; when it approaches 1, the landscape type is composed of multiple small patches.

[0050]

[0051] Among them, a i is the area of the i-th green space patch; Z is the total green space area in the study, and n is the total number of green space patches.

[0052] ⑤ Standard compliance rate of flood control dikes: The ratio of the length of flood control dikes that meet the relevant planned flood control standard requirements to the total length of the existing dikes.

[0053]

[0054] Among them, FPDCR is the standard compliance rate of flood control dikes (%); L D is the length of the compliant dikes (km); L TD is the total length of the dikes (km).

[0055] ⑥ Standard compliance rate of backbone drainage channels: The ratio of the length of up-to-standard primary drainage channels in the region to the total length of primary drainage channels.

[0056]

[0057] Among them, CCR is the standard compliance rate of backbone drainage channels (%); L C is the length of up-to-standard primary drainage channels (km); L TC is the total length of primary drainage channels (km).

[0058] ⑦ Proportion of green spaces with rainwater storage and regulation functions: The proportion of the area of green spaces with rainwater storage and regulation functions in the region to the total green space area.

[0059]

[0060] Among them, SDGR is the proportion of green spaces with rainwater storage and regulation functions (%); S SDG is the area of green spaces with rainwater storage and regulation functions (km 2 ); S G is the green space area (km 2 ).

[0061] ⑧ Degree of backwater effect of urban inland rivers on drainage pipe networks: The proportion of the number of drainage outlets of the rainwater pipe network in the region affected by backwater from the river to the total number of drainage outlets of the rainwater pipe network.

[0062]

[0063] Among them, BE is the degree of backwater effect of urban inland rivers on drainage pipe networks (%); N BESWO is the number of drainage outlets of the rainwater pipe network affected by backwater from the river (pcs); NSWO is the number of drainage outlets of the rainwater pipe network (pcs).

[0064] ⑨ Blue-green integration degree: The proportion of the area of green spaces adjacent to water bodies in the region to the total area.

[0065]

[0066] Among them, BGI is the blue-green integration degree (%); S BGG is the area of green spaces adjacent to water bodies (km 2 ); ST is the regional area (km 2 ).

[0067] ⑩ Proportion of ecological shorelines: The ratio of the length of ecological shorelines of rivers to the total length of river shorelines.

[0068]

[0069] Among them, ESR is the proportion of ecological shorelines (%); LRES is the length of the ecological shoreline of the river course (km); L RS is the length of the river course shoreline (km).

[0070] ⑪ Proportion meeting the sponge city construction standard: The proportion of the area meeting the sponge city construction standard in the total area within the region.

[0071]

[0072] Among them, SCR is the proportion meeting the sponge city construction standard (%); S SC is the area meeting the sponge city construction standard (km 2 ); S T is the regional area (km 2 ).

[0073] Step S103: Determine the values of each first evaluation index within the target area based on the evaluation indexes and weights.

[0074] Among them, the values of the first evaluation indexes include: the ratio of river and lake water surface area, green space rate, green space aggregation index, and green space fragmentation index, the compliance rate of flood control dikes, the compliance rate of backbone drainage channels, the proportion of ecological shorelines, and the proportion meeting the sponge city construction standard, the proportion of green spaces with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the degree of blue-green integration.

[0075] Among them, the values of the first evaluation indexes can be calculated by combining statistical analysis methods and urban rain flood models. For indexes such as the ratio of river and lake water surface area, green space rate, green space aggregation index, and green space fragmentation index, they are calculated using ArcGIS and Fragstats; for indexes such as the compliance rate of flood control dikes, the compliance rate of backbone drainage channels, the proportion of ecological shorelines, and the proportion meeting the sponge city construction standard, mathematical statistics methods are used for calculation; for indexes such as the proportion of green spaces with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the degree of blue-green integration, they are calculated based on ArcGIS and urban rain flood models.

[0076] Step S104: Divide the urban area into three-level drainage sub-areas, and determine the values of the second evaluation indexes at the scale of the drainage sub-areas based on the values of the first evaluation indexes.

[0077] Specifically, dividing the urban area into three-level drainage sub-areas may include: Based on natural geographical conditions, using the ArcGIS hydrological analysis method to divide the first-level natural catchment areas; Based on the first-level natural catchment areas, combining the flow direction of the planned rainwater pipe network, the positions of drainage outlets, and the road boundaries, correcting the first-level catchment areas and dividing the second-level drainage sub-areas; Based on the second-level drainage sub-areas, combining the secondary and branch pipe networks and historical waterlogging point data, dividing the third-level drainage sub-areas.

[0078] Among them, 1) Based on multi-source datasets, the hydrological analysis tools of ArcGIS can be used to correct the depression areas in the elevation data, generate depression-free data, and use the single-flow direction algorithm to determine the water flow direction. Natural and river networks are generated according to the threshold of catchment accumulation. Based on the river network and watershed, the first-level catchment sub-areas are generated; 2) Based on multi-source datasets, the vector masking tool of ArcGIS is used to extract the elevation values of the roads in the study area from the elevation data to generate a road elevation raster. The elevation of the road is adjusted to a fixed value or offset to construct a virtual terrain. Based on the virtual terrain, the multi-ring buffer tool of ArcGIS is used to set the road distance to generate a road buffer. The masking tool is used to obtain the terrain raster around the road, compare the road elevation with the surrounding terrain, and correct the elevation data of the study area. Using the hydrological analysis tools of ArcGIS, a new water flow direction matrix and a corrected first-level catchment sub-area are generated based on the corrected elevation data; 3) Based on multi-source datasets, the utility network analysis method of ArcGIS is used to create a utility network for the pipe network outlet data, define the network topology rules, label the upstream and downstream of the drainage pipes, and generate a drainage pipe network relationship diagram. Combining the drainage outlet location, depth-first search or breadth-first search is used to collect the upstream nodes and pipe segments, and all the nodes and pipe segments upstream of the drainage outlet are identified; 4) According to the research scope and the location of the drainage pipe network nodes, the Thiessen polygon tool of ArcGIS is used to preliminarily delimit the sub-catchment areas. The merge tool of ArcGIS is used to merge the sub-catchment areas corresponding to all the nodes and pipe segments upstream of the intersection of the branch and main pipe networks. Combining the corrected first-level catchment sub-areas and the urban drainage pipe network orientation, the overlay analysis tool of ArcGIS is used to divide and generate the second-level drainage sub-areas to ensure that each second-level sub-area corresponds to a main drainage pipe; 5) Based on the delimited second-level drainage sub-areas, the merge tool of ArcGIS is used to merge the sub-catchment areas corresponding to all the nodes and pipe segments upstream of the intersection of the secondary branch and main pipe networks to obtain the preliminary third-level drainage sub-areas delimited based on the secondary branch pipe networks. The historical waterlogging points are overlaid on the delimited preliminary third-level drainage sub-areas, and variables such as waterlogging points, terrain slope, and pipe network density are standardized. The clustering algorithms (K-means, DBSCAN) are used to generate waterlogging point sub-areas. Using the spatial overlay statistical analysis method, the delimited preliminary third-level drainage sub-areas and waterlogging point sub-areas are merged or split to form the third-level drainage sub-areas.

[0079] Specifically, for the grid-attribute indicators such as the water surface ratio of rivers and lakes, green space ratio, green space aggregation index, green space fragmentation index, proportion of green space with rainwater storage and regulation function, blue-green integration index, and proportion meeting the sponge city construction standard, the grid is overlaid with the drainage sub-areas, and the second evaluation index value at the scale of the drainage sub-areas is calculated using the area weighted average method. For the regional statistical indicators such as the compliance rate of flood control dikes, compliance rate of backbone drainage channels, proportion of ecological shorelines, and the degree of backwater of urban inland rivers to the drainage pipe network, the indicators within the drainage sub-areas are standardized (0-1); the drainage sub-areas without flood control dikes, drainage channels, ecological shorelines, and outfalls are scored 0.

[0080] Among them, 1) for the grid-attribute indicators, such as the water surface ratio of rivers and lakes, green space ratio, green space aggregation index, green space fragmentation index, proportion of green space with rainwater storage and regulation function, blue-green integration index, and proportion meeting the sponge city construction standard, using the spatial overlay analysis tool of ArcGIS, the grid layer is overlaid with the vector layer of the third-level drainage sub-areas, and the grid data is extracted into the third-level drainage sub-areas by clipping, and the second evaluation index value within the third-level drainage sub-areas is calculated using the area weighted average method; 2) for the linear / point vector-attribute indicators, such as the compliance rate of flood control dikes, compliance rate of backbone drainage channels, proportion of ecological shorelines, and the degree of backwater of urban inland rivers to the drainage pipe network, using the spatial overlay analysis tool of ArcGIS, the linear vector layer is overlaid with the vector layer of the third-level drainage sub-areas, and the data values within the third-level drainage sub-areas are obtained by clipping, and the indicator values within the drainage sub-areas are standardized (0-1). For those without flood control dikes, drainage channels, ecological shorelines, and drainage pipe network outfalls within the third-level drainage sub-areas, the indicator values are assigned 0.

[0081] Step S105, evaluate the rainwater storage and drainage capacity of the urban blue-green infrastructure based on the second evaluation index value.

[0082] Specifically, evaluating the rainwater storage and drainage capacity of the urban blue-green infrastructure based on the second evaluation index value includes: classifying the evaluation indicators using the natural breaks method based on the second evaluation index value to determine the evaluation grade classification boundaries and classification criteria of the evaluation indicators; obtaining the evaluation values of each dimension based on the respective weights; calculating the comprehensive evaluation score of the rainwater storage and drainage capacity of the urban blue-green infrastructure based on the weights of each dimension to evaluate the rainwater storage and drainage capacity of the urban blue-green infrastructure.

[0083] Among them, the evaluation values of each dimension are obtained using the weighted summation method, and the comprehensive evaluation score of the rainwater storage and drainage capacity of the urban blue-green infrastructure is calculated using the multi-criteria integration method based on the weights of each dimension.

[0084] The urban blue-green infrastructure storage and drainage capacity evaluation method provided by the embodiments of the present invention can construct an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure. The index system includes multiple dimensions, including: the spatial pattern dimension, the safe operation dimension, the management and control support dimension, and the storage and drainage effect dimension. Based on the evaluation index system, evaluation indexes are screened and the weights of the evaluation indexes are determined. Based on the evaluation indexes and weights, the values of each first evaluation index in the target area are determined. The urban area is divided into three-level drainage sub-areas, and based on the values of the first evaluation index, the values of the second evaluation index at the scale of the drainage sub-area are determined. Based on the values of the second evaluation index, the storage and drainage capacity of the urban blue-green infrastructure is evaluated. In this way, a multi-dimensional evaluation index system of spatial pattern, safe operation, management and control support, and storage and drainage effect is constructed, thereby increasing the evaluation dimensions, improving the evaluation system, proposing an evaluation method for the storage and drainage capacity of urban blue-green infrastructure based on the scale of drainage sub-areas, improving the accuracy of the evaluation, and providing technical support for scientifically and systematically evaluating the storage and drainage capacity of urban blue-green infrastructure for rainwater and reasonably planning and layout of urban blue-green infrastructure.

[0085] Embodiment 2 The embodiments of the present invention also provide another urban blue-green infrastructure storage and drainage capacity evaluation method; this method is implemented on the basis of the method in the above embodiments; this method focuses on describing the specific implementation manner of determining the values of each first evaluation index in the target area based on the evaluation indexes and weights.

[0086] Figure 2 It is a flowchart of another urban blue-green infrastructure storage and drainage capacity evaluation method provided by the embodiments of the present invention, as Figure 2 shown. The method for determining the values of each first evaluation index in the target area based on the evaluation indexes and weights may include the following steps: Step S201, based on the evaluation indexes of the spatial pattern dimension, use ArcGIS and Fragstats to calculate the river and lake water surface rate, green space rate, green space aggregation index, and green space fragmentation index.

[0087] Step S202, based on the evaluation indexes of the safe operation dimension and the management and control support dimension, use mathematical statistics methods to calculate the passing rate of flood control dikes, the passing rate of backbone drainage channels, the proportion of ecological shorelines, and the proportion of meeting the sponge city construction standards.

[0088] Step S203, based on the evaluation indexes of the storage and drainage effect dimension, combine ArcGIS and the urban stormwater model to calculate the proportion of green spaces with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the blue-green integration degree.

[0089] Specifically, based on the evaluation indicators of the storage and drainage effect dimension, combining ArcGIS and urban stormwater models to calculate the proportion of green spaces with rainwater storage functions, the degree of backwater of urban inland rivers on the drainage network, and the degree of blue-green integration, which can include: based on the drainage network and terrain data of the target area, establish SWMM models and LISFLOOD-FP models, and perform model coupling to obtain a coupled model; based on the coupled model, simulate the river water level and surface water accumulation under the rainfall design return period to obtain simulation results; based on the simulation results, calculate the proportion of green spaces with rainwater storage functions, the degree of backwater of urban inland rivers on the drainage network, and the degree of blue-green integration.

[0090] Among them, 1) collect remote sensing images, topographic elevations, pipe network topologies, river hydrology, precipitation data, actual monitoring data, sponge city construction conditions, etc. of the research area; 2) complete the cleaning of multi-source data, such as filling in missing items, removing duplicate values, error values, and inconsistent values in the multi-source data, and update them, so as to form a multi-source data set after data cleaning; 3) perform alignment processing on the time and space elements of the multi-source data set after data cleaning. For time elements, resampling, interpolation, etc. are used, and for space elements, coordinate system conversion, projection transformation, image registration, etc. are used to form a multi-source data set after spatio-temporal alignment; 4) based on the multi-source data set after spatio-temporal alignment, perform supervised classification on remote sensing images for interpretation to form land use data including types such as buildings, pavements, roads, green spaces, water bodies, and unused lands; 5) based on the multi-source data set, use the raster calculation tool of ArcGIS to reclassify the land use data. Combine the reclassified data and use the moving window method of Fragstats to calculate the evaluation index values of the water surface ratio of rivers and lakes, green space ratio, green space aggregation index, and green space fragmentation index; 6) based on the multi-source data set, use the statistical calculation tool of ArcGIS to calculate the evaluation index values of the proportion meeting the sponge city construction standard and the ecological shoreline ratio; use the buffer tool to calculate the evaluation index value of the blue-green integration degree; 7) based on the multi-source data set, establish a SWMM model for the research area to simulate the runoff generation and confluence of one-dimensional drainage pipe networks and the confluence of one-dimensional rivers; establish a LISFLOOD-FP model for the research area to simulate two-dimensional overland flow. Based on the C++ programming language, output the node overflow volume in the simulation results of the SWMM model as the boundary condition and input it into the LISFLOOD-FP model; output the surface water accumulation depth in the simulation results of the LISFLOOD-FP model, calculate the flow rate using the orifice submerged outflow formula, and input it as the node inflow into the SWMM model to achieve the coupled interaction of the two models. Based on the coupled model, simulate the urban river water level under the design rainfall return period. If the water level of this section of the river exceeds the top elevation of the river, this section of the river does not meet the standard, otherwise it meets the standard. Statistically calculate the length of the up-to-standard river section and calculate the compliance rate of the backbone drainage channels in the key waterlogging areas. Based on the coupled model, simulate the urban river water level under the design rainfall return period. If the water level of this section of the river exceeds the bottom elevation of the pipe network drainage outlet, the drainage outlet is blocked by the river, otherwise it is not blocked by the river. Statistically calculate the number of rainwater pipe network outlets blocked by the river and calculate the degree of river top pressure on the drainage pipe network. Based on the coupled model, simulate and calculate the coincidence degree between the urban green space position and the surface water accumulation position under the design rainfall return period. If the coincident area between the green space position and the surface water accumulation position exceeds 80% and is lower than the surrounding ground elevation, the green space has the function of storing rainwater, otherwise it does not have the function of storing rainwater. Statistically calculate the area of green spaces with the function of storing rainwater and calculate the proportion of green spaces with the function of storing rainwater.

[0091] Example 3 Corresponding to the above method embodiments, an embodiment of the present invention provides an evaluation device for the storage and drainage capacity of urban blue-green infrastructure. Figure 3 As shown in Figure 3 , which is a schematic structural diagram of an evaluation device for the storage and drainage capacity of urban blue-green infrastructure provided by an embodiment of the present invention. Figure 3 As shown, the evaluation device for the storage and drainage capacity of urban blue-green infrastructure may include: An evaluation index system construction module 301, configured to construct an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure; the index system includes multiple dimensions; the dimensions include: a spatial pattern dimension, a safe operation dimension, a management and control support dimension, and a storage and drainage effect dimension; An evaluation index screening module 302, configured to screen evaluation indexes based on the evaluation index system and determine the weights of the evaluation indexes; A first evaluation index value determination module 303, configured to determine the values of each first evaluation index in the target area based on the evaluation indexes and weights; A second evaluation index value determination module 304, configured to divide the urban area into three-level drainage sub-areas, and determine the values of the second evaluation indexes at the scale of the drainage sub-areas based on the values of the first evaluation indexes; A storage and drainage capacity evaluation module 305, configured to evaluate the storage and drainage capacity of urban blue-green infrastructure based on the values of the second evaluation indexes.

[0092] The evaluation device for the storage and drainage capacity of urban blue-green infrastructure provided by the embodiment of the present invention can construct an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure. The index system includes multiple dimensions, including: a spatial pattern dimension, a safe operation dimension, a management and control support dimension, and a storage and drainage effect dimension. Screen evaluation indexes based on the evaluation index system and determine the weights of the evaluation indexes, determine the values of each first evaluation index in the target area based on the evaluation indexes and weights, divide the urban area into three-level drainage sub-areas, and determine the values of the second evaluation indexes at the scale of the drainage sub-areas based on the values of the first evaluation indexes, and evaluate the storage and drainage capacity of urban blue-green infrastructure based on the values of the second evaluation indexes. In this way, a multi-dimensional evaluation index system of spatial pattern, safe operation, management and control support, and storage and drainage effect is constructed, thereby increasing the evaluation dimensions, improving the evaluation system, proposing an evaluation method for the storage and drainage capacity of urban blue-green infrastructure based on the scale of drainage sub-areas, improving the accuracy of the evaluation, and providing technical support for scientifically and systematically evaluating the storage and drainage capacity of urban blue-green infrastructure for rainwater and reasonably planning and layout of urban blue-green infrastructure.

[0093] In some embodiments, the evaluation index system construction module is further configured to generate an initial evaluation index set based on predetermined construction requirements; screen the final evaluation indexes from the initial evaluation index set through correlation analysis; divide the spatial pattern dimension, the safe operation dimension, the management and control support dimension, and the storage and drainage effect dimension based on the final evaluation indexes; and construct an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure based on the spatial pattern dimension, the safe operation dimension, the management and control support dimension, and the storage and drainage effect dimension.

[0094] In some embodiments, the evaluation index screening module is further configured to select the river and lake water surface rate, the green space rate, the green space aggregation index, and the green space fragmentation index from the initial evaluation index set as the evaluation indexes for the spatial pattern dimension; select the flood control dike compliance rate and the backbone drainage channel compliance rate from the initial evaluation index set as the evaluation indexes for the safe operation dimension; select the ecological shoreline ratio and the proportion meeting the sponge city construction standard from the initial evaluation index set as the evaluation indexes for the management and control support dimension; select the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree from the initial evaluation index set as the evaluation indexes for the storage and drainage effect dimension; and determine the weights of each evaluation index by using the analytic hierarchy process and the entropy weight method.

[0095] In some embodiments, the first evaluation index values include: the river and lake water surface rate, the green space rate, the green space aggregation index, and the green space fragmentation index, the flood control dike compliance rate, the backbone drainage channel compliance rate, the ecological shoreline ratio, and the proportion meeting the sponge city construction standard, the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree; the first evaluation index value determination module is further configured to calculate the river and lake water surface rate, the green space rate, the green space aggregation index, and the green space fragmentation index based on the evaluation indexes of the spatial pattern dimension by using ArcGIS and Fragstats; calculate the flood control dike compliance rate, the backbone drainage channel compliance rate, the ecological shoreline ratio, and the proportion meeting the sponge city construction standard by using mathematical statistics methods based on the evaluation indexes of the safe operation dimension and the management and control support dimension; and calculate the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree in combination with ArcGIS and the urban rainstorm model based on the evaluation indexes of the storage and drainage effect dimension.

[0096] In some embodiments, the first evaluation index value determination module is further configured to establish a SWMM model and a LISFLOOD-FP model based on the drainage pipe network and terrain data of the target area, and perform model coupling to obtain a coupled model; simulate the river channel water level and surface water accumulation conditions under the rainfall design return period based on the coupled model to obtain a simulation result; and calculate the proportion of green space with rainwater storage and regulation function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree based on the simulation result.

[0097] In some embodiments, the second evaluation index value determination module is further configured to divide the primary natural catchment areas based on the natural geographical conditions by using the ArcGIS hydrological analysis method; based on the primary natural catchment areas, in combination with the flow direction of the planned rainwater pipe network, the positions of the drainage outlets, and the road boundaries, correct the primary catchment areas and divide the secondary drainage areas; based on the secondary drainage areas, in combination with the data of the secondary and branch pipe networks and the historical waterlogging points, divide the tertiary drainage areas.

[0098] In some embodiments, the storage and drainage capacity evaluation module is further configured to perform grading processing on the evaluation indexes by using the natural breakpoint method based on the second evaluation index value, determine the evaluation grade grading boundaries and grading criteria of the evaluation indexes; obtain the evaluation values of each dimension based on the respective weights; calculate the comprehensive evaluation score of the storage and drainage capacity of the urban blue-green infrastructure based on the weights of each dimension, so as to evaluate the storage and drainage capacity of the urban blue-green infrastructure.

[0099] The device provided by the embodiments of the present invention has the same implementation principle and the same technical effects as those of the foregoing method embodiments. For the sake of brief description, for the parts not mentioned in the device embodiments, reference may be made to the corresponding contents in the foregoing method embodiments.

[0100] Embodiment 4 The embodiments of the present invention further provide an electronic device for running the above-mentioned method for evaluating the storage and drainage capacity of urban blue-green infrastructure; see Figure 4 The structural schematic diagram of an electronic device shown. The electronic device includes a memory 400 and a processor 401. Among them, the memory 400 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor 401 to implement the above-mentioned method for evaluating the storage and drainage capacity of urban blue-green infrastructure.

[0101] Furthermore, Figure 4 The electronic device shown further includes a bus 402 and a communication interface 403, and the processor 401, the communication interface 403, and the memory 400 are connected through the bus 402.

[0102] Among them, the memory 400 may include a high-speed random access memory (RAM, Random Access Memory), and may also include a non-volatile memory, such as at least one disk memory. Through at least one communication interface 403 (which can be wired or wireless), a communication connection is realized between the system network element and at least one other network element, and the Internet, wide area network, local area network, metropolitan area network, etc. can be used. The bus 402 may be an ISA bus, a PCI bus, an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, Figure 4 only a bidirectional arrow is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0103] The processor 401 may be an integrated circuit chip with the ability to process signals. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in the processor 401 or the instructions in the form of software. The above-mentioned processor 401 may be a general-purpose processor, including a central processing unit (CPU for short), a network processor (NP for short), etc.; it may also be a digital signal processor (DSP for short), an application specific integrated circuit (ASIC for short), a field-programmable gate array (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute each method, step and logic block diagram disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present invention can be directly embodied as being executed and completed by the hardware decoding processor, or executed and completed by a combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 400, and the processor 401 reads the information in the memory 400 and combines its hardware to complete the steps of the method in the foregoing embodiments.

[0104] The embodiments of the present invention also provide a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the above-mentioned method for evaluating the storage and drainage capacity of urban blue-green infrastructure. For the specific implementation, reference can be made to the method embodiments, and details are not described herein again.

[0105] The computer program product for the method of evaluating the storage and drainage capacity of urban blue-green infrastructure provided by the embodiments of the present invention includes a computer-readable storage medium storing non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the method described in the foregoing method embodiments. For the specific implementation, reference can be made to the method embodiments, and details are not described herein again.

[0106] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

[0107] In several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some communication interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0108] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0109] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0110] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs and other various media that can store program codes.

[0111] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field of the present invention can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An evaluation method for the storage and drainage capacity of urban blue-green infrastructure, characterized in that, The method includes: Constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure; the index system includes multiple dimensions; the dimensions include: the spatial pattern dimension, the safe operation dimension, the management and control support dimension, and the storage and drainage effect dimension; Screening evaluation indexes based on the evaluation index system and determining the weights of the evaluation indexes; Determining the values of each first evaluation index in the target area based on the evaluation indexes and the weights; Dividing the urban area into three-level drainage sub-areas, and determining the values of the second evaluation index at the scale of the drainage sub-areas based on the values of the first evaluation index; Evaluating the storage and drainage capacity of urban blue-green infrastructure based on the values of the second evaluation index.

2. The method according to claim 1, wherein The construction of the evaluation index system for the storage and drainage capacity of urban blue-green infrastructure includes: Generating an initial evaluation index set based on predetermined construction requirements; Screening to obtain the final evaluation indexes based on the initial evaluation index set through correlation analysis; Dividing the spatial pattern dimension, the safe operation dimension, the management and control support dimension, and the storage and drainage effect dimension based on the final evaluation indexes; Constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure based on the spatial pattern dimension, the safe operation dimension, the management and control support dimension, and the storage and drainage effect dimension.

3. The method according to claim 2, wherein The screening of evaluation indexes based on the evaluation index system and the determination of the weights of the evaluation indexes include: Selecting the lake and river water surface ratio, green space ratio, green space aggregation index, and green space fragmentation index from the initial evaluation index set as the evaluation indexes for the spatial pattern dimension; Selecting the flood control dike compliance rate and the compliance rate of the backbone drainage channels from the initial evaluation index set as the evaluation indexes for the safe operation dimension; Selecting the proportion of ecological shorelines and the proportion meeting the sponge city construction standards from the initial evaluation index set as the evaluation indexes for the management and control support dimension; Selecting the proportion of green spaces with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the blue-green integration degree from the initial evaluation index set as the evaluation indexes for the storage and drainage effect dimension; Using the analytic hierarchy process and the entropy weight method to determine the weights of each evaluation index.

4. The method according to claim 2, wherein The values of the first evaluation index include: the lake and river water surface ratio, green space ratio, green space aggregation index, and green space fragmentation index, the flood control dike compliance rate, the compliance rate of the backbone drainage channels, the proportion of ecological shorelines, and the proportion meeting the sponge city construction standards, the proportion of green spaces with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the blue-green integration degree; The determination of the values of each first evaluation index in the target area based on the evaluation indexes and the weights includes: Based on the evaluation indexes of the spatial pattern dimension, using ArcGIS and Fragstats to calculate the lake and river water surface ratio, green space ratio, green space aggregation index, and green space fragmentation index; Based on the evaluation indexes of the safe operation dimension and the management and control support dimension, using mathematical statistics methods to calculate the flood control dike compliance rate, the compliance rate of the backbone drainage channels, the proportion of ecological shorelines, and the proportion meeting the sponge city construction standards; Based on the evaluation indexes of the storage and drainage effect dimension, combining ArcGIS and the urban stormwater model to calculate the proportion of green spaces with rainwater storage and regulation functions, the degree of backwater of urban inland rivers to the drainage pipe network, and the blue-green integration degree.

5. The method according to claim 4, wherein The evaluation indicators based on the storage and drainage effect dimension, combined with ArcGIS and urban stormwater models, calculate the proportion of green spaces with rainwater storage function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree, including: Based on the drainage pipe network and terrain data of the target area, establish an SWMM model and an LISFLOOD-FP model, and perform model coupling to obtain a coupled model; Based on the coupled model, simulate the river water level and surface water accumulation under the rainfall design return period to obtain simulation results; Based on the simulation results, calculate the proportion of green spaces with rainwater storage function, the degree of backwater of urban inland rivers on the drainage pipe network, and the blue-green integration degree.

6. The method according to claim 5, characterized in that, The three-level drainage area division of the urban area includes: Based on natural geographical conditions, use the ArcGIS hydrological analysis method to divide the first-level natural catchment area; Based on the first-level natural catchment area, combined with the flow direction of the planned rainwater pipe network, the position of the drainage outlet and the road boundary, correct the first-level catchment area and divide the second-level drainage area; Based on the second-level drainage area, combined with the data of secondary and branch pipe networks and historical waterlogging points, divide the third-level drainage area.

7. The method according to claim 1, characterized in that, The evaluation of the storage and drainage capacity of urban blue-green infrastructure based on the second evaluation index value includes: Based on the second evaluation index value, use the natural breakpoint method to classify the evaluation index, and determine the evaluation grade classification boundary and classification standard of the evaluation index; Based on each of the weights, obtain the evaluation values of each dimension; Calculate the comprehensive score of the evaluation of the storage and drainage capacity of urban blue-green infrastructure based on the weights of each dimension to evaluate the storage and drainage capacity of urban blue-green infrastructure.

8. An evaluation device for the storage and drainage capacity of urban blue-green infrastructure, characterized in that, The device includes: An evaluation index system construction module for constructing an evaluation index system for the storage and drainage capacity of urban blue-green infrastructure; the index system includes multiple dimensions; the dimensions include: spatial pattern dimension, safe operation dimension, management and control support dimension, and storage and drainage effect dimension; An evaluation index screening module for screening evaluation indexes based on the evaluation index system and determining the weights of the evaluation indexes; A first evaluation index value determination module for determining the values of each first evaluation index in the target area based on the evaluation index and the weight; A second evaluation index value determination module for performing three-level drainage area division on the urban area and determining the second evaluation index value at the drainage area scale based on the first evaluation index value; A storage and drainage capacity evaluation module for evaluating the storage and drainage capacity of urban blue-green infrastructure based on the second evaluation index value.

9. An electronic device, characterized in that, It includes a processor and a memory, the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the method for evaluating the storage and drainage capacity of urban blue-green infrastructure according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer executable instructions, and when the computer executable instructions are called and executed by the processor, the computer executable instructions cause the processor to implement the method for evaluating the storage and drainage capacity of urban blue-green infrastructure according to any one of claims 1 to 7.

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