Method for determining width of urban ecological corridor based on river and road

Abstract

This invention relates to a method for determining the width of urban ecological corridors relying on rivers and roads, comprising: acquiring and preprocessing geographic information data of a target area; constructing an ecological source area screening index system to identify ecological source areas; constructing a comprehensive resistance surface; determining potential corridor paths between any two ecological source areas; identifying current density maps of areas in potential corridor paths that play an important role in animal migration; overlaying river and road layer data with the current density map, extracting a buffer zone with a width of 100m and calculating the average current density to obtain a buffer zone layer with current information; presetting a minimum width, dividing the buffer zone into several levels according to the average current density, extracting the corridors corresponding to the buffer zones, and then assigning each corridor a minimum width corresponding to its level according to the preset value. This invention determines the width levels of urban corridors based on current density, which helps to determine the width range of urban ecological corridors relying on rivers and roads.

Description

Technical Field

[0001] This invention relates to the field of ecological environment, and specifically to a method for determining the width of urban ecological corridors based on rivers and roads. Background Technology

[0002] Rapid urbanization has led to problems such as declining biodiversity in urbanized areas, exacerbating the conflict between urban ecological protection and urban development. The scientific planning and construction of urban ecological corridors is an effective way to address this issue. The construction of urban ecological corridors is a crucial step in implementing urban ecological space planning under the national land spatial planning framework. It is an important way to protect biodiversity, improve the quality of urban and rural landscapes, enhance public recreational spaces, and increase the value of ecosystem services. It is also a key link in promoting coordinated urban and rural development, harmony between humans and nature, and the improvement of ecosystems.

[0003] Due to the linear structure of urban ecological corridors, both species diversity and ecological benefits are influenced by corridor width. From a landscape ecology perspective, wider ecological corridors have more pronounced ecological effects; conversely, narrower corridors are more susceptible to human activities. However, from a botany perspective, wider corridors are not always more beneficial; excessive width hinders rapid migration of organisms, requiring a suitable width. Overly large ecological corridors lead to a waste of land resources, while overly narrow corridors are detrimental to ecological space development. In urbanized areas, ecological corridors are mostly integrated with linear spatial layouts such as rivers and roads. The unclear width of urban ecological corridors restricts the effectiveness of urban ecological networks, making the definition of urban ecological corridor width a pressing issue. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for determining the width of urban ecological corridors that rely on rivers and roads, applicable to determining the width of urban ecological corridors that rely on roads and rivers.

[0005] The technical objective of this invention is achieved through the following technical solution:

[0006] A method for determining the width of urban ecological corridors based on rivers and roads includes the following steps:

[0007] Step 1: Obtain geographic information data for the target area. The geographic information data includes vector boundary layer data, land use vector layer data, and river and road layer data. Then, the geographic information data layers are cropped and aggregated.

[0008] Step 2: Construct an ecological source area screening index system to identify ecological source areas;

[0009] Step 3: Combine land use type and NDVI to construct a comprehensive resistance surface;

[0010] Step 4: Import the integrated resistance surface data and ecological source area data into Linkage Mapper to determine the potential corridor path between any two ecological source areas;

[0011] Step 5: Based on circuit theory, use the Pinchpoint tool to identify regions in potential corridor paths that play an important role in connectivity for animal migration and obtain current density maps.

[0012] Step 6: Overlay the river and road layer data with the current density map, extract a buffer with a width of 100m along the river and road data, and calculate the average current density within the buffer using a partition statistics tool to obtain a buffer layer with current information.

[0013] Step 7: Preset the minimum width corresponding to each level. Using the natural breakpoint method, divide all buffers with current information into several levels according to the average current density. Extract the buffers from the highest level down according to their level to obtain the corridors corresponding to the extracted buffers. Then, assign the minimum width corresponding to the corresponding level to each corridor according to the preset value.

[0014] Furthermore, in step 2, urban green spaces are extracted using ArcGIS, and urban green spaces larger than 5 hectares are selected as pre-selected urban ecological source areas. Then, an ecological source area screening index system is constructed to identify ecological source areas from the pre-selected urban ecological source areas.

[0015] Furthermore, the ecological source area screening index system includes four factors: vegetation quality, connectivity index, cold island effect index, and area. After classifying the four factors into different levels, they are weighted and superimposed. Based on a preset threshold, the ecological source areas are screened from the weighted superimposed results.

[0016] Furthermore, in step 3, all factors of the land use type are weighted and assigned values, and the land use type is superimposed with the NDVI image to obtain the comprehensive resistance surface.

[0017] Furthermore, in step 4, the integrated resistance surface and the ecological source area are imported into Linkage Mapper, the ecological source area and the resistance surface are selected, and the potential corridor path between any two ecological source areas is determined based on the minimum cumulative resistance model.

[0018] Furthermore, the minimum cost path between ecological source areas is simulated using the MCR model to determine the potential corridor path between any two ecological source areas.

[0019]

[0020] Where f represents the minimum cumulative resistance value, and D ij R represents the spatial distance from ecological source j to spatial unit i. iThis represents the drag coefficient of unit i.

[0021] Furthermore, in step 5, based on circuit theory, the Pinchpoint tool is used to input ecological source area and comprehensive resistance surface data, and the cost-weighted distance is set as a threshold. The Pinchpoint tool is then run to identify high current density areas in potential ecological corridors and obtain a current density map.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (1) The method for determining the width of urban ecological corridors relying on rivers and roads in this invention determines the width level of urban corridors based on current density, clarifies the urgency of ecological restoration of linear spaces such as different rivers and roads, and helps to determine the width range of urban ecological corridors relying on rivers and roads.

[0024] (2) By using urban river and road linear spatial data as alternative routes for urban ecological corridors, this invention maximizes the adaptation to the current situation where most existing urban corridors are built based on linear spaces such as rivers and roads at the urban planning level.

[0025] (3) This invention identifies ecological source areas by coupling land use type and NDVI, taking into account the differences in ecological benefits of different land types while considering the current land status under urbanization conditions.

[0026] (4) Most existing technologies obscure the material flow within the ecological network. This invention explores the animal migration process of potential urban ecological corridors through circuit theory, taking into account the needs of animal migration in order to provide precise guidance for the construction of urban ecological corridors. Attached Figure Description

[0027] Figure 1 This is a distribution map of the ecological source areas selected in the embodiments of the present invention.

[0028] Figure 2 This is a comprehensive resistance surface distribution diagram in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the potential corridor distribution in an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the distribution of ecological source areas in an embodiment of the present invention.

[0031] Figure 5 This is a current density diagram in an embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the width of an urban ecological corridor relying on roads and rivers in an embodiment of the present invention. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0034] A method for determining the width of urban ecological corridors based on rivers and roads, taking Minhang District of Shanghai as an example, includes the following steps:

[0035] Step 1: Obtain geographic information data for Minhang District, Shanghai. The geographic information data includes vector boundary layer data, land use vector layer data, and river and road layer data. Open the vector boundary layer data, land use vector layer data, and river and road layer data in the GIS platform. Open the layer properties in the content list. Unify the coordinates (Shanghai local coordinates) in the coordinate system column and unify the units (meters) in the general column. Then, crop and aggregate the geographic information data layers to the target area.

[0036] Step 2: Construct an ecological source area screening index system to identify ecological source areas;

[0037] Urban green spaces were extracted using ArcGIS. Urban green spaces larger than 5 hectares were selected as pre-selected urban ecological source areas. Then, an ecological source area screening index system was constructed to identify ecological source areas from the pre-selected urban ecological source areas. The ecological source area screening index system includes four factors: vegetation quality, connectivity index, cold island effect index, and area. Each of the four factors is divided into 10 levels and then weighted and overlaid. Ecological source areas are selected from the weighted overlay results based on preset thresholds. In this embodiment, the top three levels of pre-selected urban ecological source areas are selected as ecological source areas, ultimately resulting in 39 ecological source areas. Figure 1 As shown.

[0038] Step 3: Combine land use type and NDVI to construct a comprehensive resistance surface;

[0039] Land use types include ecological space and non-ecological space: In ecological space, woodland, green space, wetland, grassland and garden have relatively low ecological barriers; rivers, lakes and reservoirs are usually difficult to cross and have relatively high contribution values;

[0040] In non-ecological spaces, residential land, road land, industrial and mining land, and warehousing land have relatively high ecological barriers; non-ecological spaces with high ecological barriers include highways and high-speed railways.

[0041] Weighted values ​​are assigned to all factors related to land use type, and the land use type is overlaid with the NDVI image to obtain a comprehensive resistance surface, such as... Figure 2 As shown, the darker the color, the greater the resistance value.

[0042] Step 4: Import the integrated resistance surface data and ecological source area data into Linkage Mapper. Select the ecological source area and resistance surface, and determine the potential corridor path between any two ecological source areas based on the minimum cumulative resistance model, such as... Figure 3 As shown.

[0043] The minimum cost path between ecological source areas is simulated using the MCR model to determine the potential corridor path between any two ecological source areas.

[0044]

[0045] Where f represents the minimum cumulative resistance value, and D ij R represents the spatial distance from ecological source j to spatial unit i. i The drag coefficient represents unit i.

[0046] Step 5: Based on circuit theory, use the Pinchpoint tool to input ecological source area and integrated resistance surface data, set cost-weighted distance as a threshold, and run the Pinchpoint tool to identify high current density areas in potential ecological corridors, obtaining a current density map, such as... Figure 4 As shown.

[0047] Step 6: Overlay the river and road layer data with the current density map. Extract a 100m wide buffer zone along the river and road data. Calculate the average current density within the buffer zone using the zoning statistics tool in ArcGIS to obtain a buffer layer with current information, as shown below. Figure 5 As shown.

[0048] Step 7: Preset the minimum width corresponding to each level. Using the natural breakpoint method, divide all buffers with current information into several levels according to the average current density. Extract buffers from the highest level down according to the level of the buffer to obtain the corridor corresponding to the extracted buffer. Then input the preset value into the GIS platform and use the buffer tool to make the buffer of the corresponding width to form the corridor boundary with the minimum width.

[0049] In this embodiment, the corridors corresponding to the first 5 levels of buffer zones are extracted. The minimum widths of the corridors corresponding to the first 5 levels of buffer zones are preset to be 30m, 60m, 100m, 150m, and 200m, respectively, with wider widths for higher current densities. All buffer zones containing current information are divided into 10 levels using the natural breakpoint method. The first 5 levels of buffer zones are extracted, corridors with relatively low current densities are removed, and each corridor is assigned a corresponding minimum width based on the preset minimum width value. Figure 6 As shown.

[0050] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for determining the width of urban ecological corridors relying on rivers and roads, characterized in that, Includes the following steps: Step 1: Obtain geographic information data for the target area. The geographic information data includes vector boundary layer data, land use vector layer data, and river and road layer data. Then, the geographic information data layers are cropped and aggregated. Step 2: Construct an ecological source area screening index system to identify ecological source areas; Step 3: Combine land use type and NDVI to construct a comprehensive resistance surface; Step 4: Import the integrated resistance surface data and ecological source area data into Linkage Mapper to determine the potential corridor path between any two ecological source areas; Step 5: Based on circuit theory, use the Pinchpoint tool to identify regions in potential corridor paths that play an important role in connectivity for animal migration and obtain current density maps. Step 6: Overlay the river and road layer data with the current density map, extract a buffer with a width of 100m along the river and road data, and calculate the average current density within the buffer using a partition statistics tool to obtain a buffer layer with current information. Step 7: Preset the minimum width corresponding to each level. Using the natural breakpoint method, divide all buffers with current information into several levels according to the average current density. Extract the buffers from the highest level down according to their level to obtain the corridors corresponding to the extracted buffers. Then, assign the minimum width corresponding to the corresponding level to each corridor according to the preset value.

2. The method for determining the width of urban ecological corridors relying on rivers and roads according to claim 1, characterized in that, In step 2, urban green spaces are extracted using ArcGIS. Urban green spaces larger than 5 hectares are selected as pre-selected urban ecological sources. Then, an ecological source screening index system is constructed to identify ecological sources from the pre-selected urban ecological sources.

3. The method for determining the width of urban ecological corridors relying on rivers and roads according to claim 2, characterized in that, The ecological source area screening index system includes four factors: vegetation quality, connectivity index, cold island effect index, and area. The four factors are classified into different levels and then weighted and superimposed. Based on a preset threshold, the ecological source areas are screened from the weighted superimposed results.

4. The method for determining the width of urban ecological corridors relying on rivers and roads according to claim 1, characterized in that, In step 3, all factors of the land use type are weighted and assigned values, and the land use type is superimposed with the NDVI image to obtain the comprehensive resistance surface.

5. The method for determining the width of urban ecological corridors relying on rivers and roads according to claim 1, characterized in that, In step 4, the integrated resistance surface and the ecological source area are imported into Linkage Mapper, the ecological source area and the resistance surface are selected, and the potential corridor path between any two ecological source areas is determined based on the minimum cumulative resistance model.

6. The method for determining the width of urban ecological corridors relying on rivers and roads according to claim 5, characterized in that, The minimum cost path between ecological source areas is simulated using the MCR model to determine the potential corridor path between any two ecological source areas. Where f represents the minimum cumulative resistance value, and D ij R represents the spatial distance from ecological source j to spatial unit i. i The drag coefficient represents unit i.

7. The method for determining the width of urban ecological corridors relying on rivers and roads according to claim 1, characterized in that, In step 5, based on circuit theory, the Pinchpoint tool is used to input ecological source area and comprehensive resistance surface data, and the cost-weighted distance is set as a threshold. The Pinchpoint tool is then run to identify high current density areas in potential ecological corridors and obtain a current density map.

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