Spatial model and index evaluation method of blue-green fusion

Abstract

The present invention relates to a spatial model of blue-green integration and an index evaluation method, which includes the following steps: constructing a sequential integration system integrating water bodies, land, and water-land transition zones, and determining an evaluation index system from four levels: environment, ecology, society, and economy according to a fuzzy evaluation method; determining the evaluation level and score of secondary indicators according to the evaluation content of the indicators at the four levels; establishing evaluation standards, calculating the total score according to the different scores of the secondary indicators, applying the analytic hierarchy process to determine the weights and analyze, determining the final ecological health level, and making a comprehensive evaluation. The above-mentioned spatial model of blue-green integration and the index evaluation method, after data integration by analytic hierarchy process and other methods, create a spatial model of blue-green integration and an evaluation system of the spatial structure and ecological function of blue-green integration. The evaluation results can reflect the coordination of water-green integration and the lives of local residents in urban planning, and provide scientific and technological support for the planning and design of blue-green space.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological city construction, and in particular to a blue-green fusion spatial model and an index evaluation method. Background Art

[0002] Blue-green integrated space refers to the general term for the two ecological elements of water bodies and green spaces in the city. "Blue space" refers to all natural and artificial areas in the city, including rivers, lakes, reservoirs, wetlands, etc.; "green space" refers to all vegetation-covered areas in the urban area, including mountains, woodlands, farmlands, grasslands and ecological corridors, as well as medium and large green spaces, strip green spaces, protective green belts and public open spaces in the city.

[0003] Blue-green integrated space is the main object of urban ecological network construction and landscape shaping, and its construction quality directly affects the urban ecological livable environment and ecological construction. In the rapid urban construction, the construction of "blue-green" space is carried out separately. For a long time, in the actual urban construction, the blue-green separation and the waterside construction have caused many problems such as blue-green rupture and waterside segmentation, which has aggravated the evolution of the blue-green ecological pattern, resulting in a "gap" in the integrity of the urban ecology, lack of mutual integration, and the failure to reflect the ecological effect and ecological synergistic service functions, making it difficult to highlight the ecological beauty characteristics. In addition, the blue-green ecological elements are damaged in the urbanization construction, which has caused a series of ecological problems such as urban hydrological cycle, environmental pollution, aggravated climate of heat island, dry island and rain island, soil erosion, and erosion of natural habitats, which seriously restricts the construction quality of the urban ecological livable environment. In addition, there is no complete indicator system for the evaluation of urban blue-green space planning and design. The system for evaluating the water body and green space environment of blue-green space simply applies the relevant indicator system of rivers or parks to the blue-green space in the new era. However, this does not fit the spatial structure and ecological function of blue-green integration.

[0004] In the process of urbanization, the planning of water conservancy, greening and landscape is seriously fragmented, resulting in frequent repairs and repeated construction of urban road green spaces, which greatly affects the lives and production of local residents. At present, urban planning or landscape design and other related professions only consider two separate parts, water bodies and green spaces, in the process of urban construction. Moreover, the establishment and research of the existing evaluation index system for urban rivers, parks, etc. also separates water bodies and green spaces for evaluation, and does not combine the two as a whole for systematic evaluation of blue-green integration. In the planning process, the planning coordination and the comprehensiveness of the urban ecosystem are not considered. There is a lack of scientific indicators as a basic basis, and the spatial structure and ecological function of blue-green integration cannot be evaluated with a suitable indicator system. Therefore, it cannot reflect the impact of the blue-green environment on people's lives in the urban ecosystem where people and nature coexist harmoniously, and it is impossible to carry out the construction of blue-green integration in future planning and design, and it is impossible to fundamentally improve the quality of the human living environment. At the same time, the current indicator evaluation system lacks reliable data evaluation indicators, and cannot evaluate the harmony of the combination of blue space and green space in urban design and the health of the blue-green integration system. Summary of the invention

[0005] Based on this, it is necessary to construct a simple and practical blue-green fusion spatial model and indicator evaluation method to address the problems of the lack of traditional blue-green fusion space construction and the defects of the corresponding indicator evaluation method.

[0006] A blue-green fusion spatial model comprises a green space, a land-water ecotone and a blue space, wherein the land-water ecotone connects the green space and the blue space and is located between the green space and the blue space, and the horizontal height of the green space is greater than the horizontal height of the blue space.

[0007] Furthermore, the green space is a space covered and enclosed by vegetation, and the green space includes parks, residential green spaces, road green spaces, production protection green spaces and woodlands. The production protection green space is located on the side close to the terrestrial and water-land ecotone, the park borders the production protection green space and is located on the side of the production protection green space away from the terrestrial and water-land ecotone, the woodland borders the park and is located on the side of the park away from the production protection green space, the road green space borders the woodland and is located on the side of the woodland away from the park, and the residential green space borders the road green space and is located on the side of the road green space away from the woodland.

[0008] Furthermore, the terrestrial and aquatic zone is a transition zone for material transmission, energy conversion and information exchange between land and water. The terrestrial and aquatic zone includes a hard coastline, an ecological coastline and waterfront green space. The hard coastline borders the ecological coastline and is located between the green space and the blue space with the ecological coastline. The waterfront green space is located within the ecological coastline.

[0009] Furthermore, the blue space includes a composite space formed by wetlands, waterfront green spaces and blue corridors, and the blue space includes rivers, reservoirs, lakes and ponds.

[0010] A method for evaluating an index of a blue-green fusion spatial model comprises the following steps:

[0011] Construct a sequential integration system integrating water bodies, land, and terrestrial and hydrozonal zones, and determine the evaluation index system from the four levels of environment, ecology, society, and economy based on the fuzzy evaluation method; wherein the evaluation index system includes primary indicators and secondary indicators;

[0012] Determine the evaluation level and score of the secondary indicators according to the evaluation contents of the four levels of indicators;

[0013] Establish evaluation criteria, calculate the total score based on the different scores of the secondary indicators, apply the hierarchical analysis method to determine the weights and conduct analysis, determine the final ecological health level, and make a comprehensive evaluation.

[0014] Furthermore, the step of constructing a sequential integration system integrating water bodies, land, and terrestrial and hydrozonal zones includes the following steps:

[0015] The construction of the sequential integration system is based on the planning characteristics of urban blue-green spaces, the degree of integration of water bodies and green spaces, and ecological planning goals.

[0016] Furthermore, the environmental level includes three first-level indicators: water quality, water pattern morphology characteristics and riverbank conditions; the first-level water quality indicator includes a second-level indicator of comprehensive pollution index; the first-level water pattern morphology indicator includes four second-level indicators: river channel development, riverbed stability, flow velocity and water volume; the first-level riverbank conditions indicator includes three second-level indicators: riverbank stability, interlaced zone sediments and bank protection types.

[0017] Furthermore, the ecological level includes two first-level indicators: biodiversity and landscape diversity; the first-level indicator of biodiversity includes two second-level indicators: Shannon-Wiener index and Pielou evenness index; the first-level indicator of landscape diversity includes three second-level indicators: vegetation coverage, green accessibility and ecological livability.

[0018] Furthermore, the social level includes two first-level indicators: social security and social health; the first-level social security indicator includes three second-level indicators: drinking water quality safety, biological invasion threat and ambient air quality index; the first-level social health indicator includes two second-level indicators: resident satisfaction and health literacy; the economic level includes a first-level indicator of ecological value; the first-level ecological value indicator includes two second-level indicators: landscape benefits and cultural service benefits.

[0019] Furthermore, the step of applying the analytic hierarchy process to determine the weights includes the following steps:

[0020] Building a hierarchical model;

[0021] Construct a judgment matrix;

[0022] Calculate the full sorting weight vector and perform consistency check;

[0023] Calculate the total sorting weight vector and perform consistency check;

[0024] The final comprehensive evaluation result is calculated based on the weight of each indicator layer and the score of the grade evaluation table.

[0025] The above-mentioned spatial model and index evaluation method of blue-green integration, green space, blue space and water-land transition zone constitute the organism of aquatic ecosystem, terrestrial ecosystem and water-land transition zone system, filling the gap in the construction of blue-green integration space and improving the living environment of residents. Water bodies and land are regarded as a whole of an urban ecosystem, and are integrated into the blue-green space planning, covering the evaluation of indicators at four levels: environment, ecology, society and economy. The evaluation indicators are quantified, and the improvement from quantitative change to qualitative change is made. The evaluation results are indicated by scientific data. After data integration through methods such as hierarchical analysis, an evaluation system of spatial structure and ecological function of blue-green integration is created. The evaluation results can reflect the coordination of water-green integration in urban planning and the lives of local residents, and provide a certain reference value for the planning and design of blue-green space. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a spatial model of blue-green fusion according to an embodiment;

[0027] Figure 2 A top view of a blue-green fusion spatial model of an embodiment;

[0028] Figure 3 A flow chart of an indicator evaluation method for a blue-green fusion spatial model according to an embodiment;

[0029] Figure 4 This is a diagram of the blue-green integration indicator evaluation system. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 and Figure 2 As shown, in one embodiment, a spatial model of blue-green integration includes a green space 110, a water-land ecotone 120, and a blue space 130. The water-land ecotone 120 connects the green space 110 and the blue space 130, and is located between the green space 110 and the blue space 130. The horizontal height of the green space 110 is greater than the horizontal height of the blue space 130.

[0032] In the above-mentioned spatial model of blue-green integration, the green space 110, the blue space 130 and the terrestrial ecotone 120 constitute an organism of aquatic ecosystem, terrestrial ecosystem and terrestrial ecotone system, which fills the gap in the construction of blue-green integrated space and improves the living environment of residents.

[0033] In this embodiment, the green space 110 is a space covered and enclosed by vegetation. Specifically, the green space includes parks, residential green spaces, road green spaces, production protection green spaces and woodlands. The production protection green space is located on the side close to the terrestrial and water-land ecotone, and the park borders the production protection green space and is located on the side of the production protection green space away from the terrestrial and water-land ecotone. The woodland borders the park and is located on the side of the park away from the production protection green space. The road green space borders the woodland and is located on the side of the woodland away from the park. The residential green space borders the road green space and is located on the side of the road green space away from the woodland.

[0034] In this embodiment, the land-water transition zone is a transition zone for material transmission, energy conversion and information exchange between land and water. Specifically, the land-water transition zone includes hard coastline, ecological coastline and waterfront green space. The hard coastline borders the ecological coastline and is located between the green space and the blue space with the ecological coastline, and the waterfront green space is located in the ecological coastline.

[0035] In this embodiment, the blue space includes a composite space composed of wetlands, waterfront green spaces and blue corridors. Specifically, the wetlands include rivers, reservoirs, lakes and ponds.

[0036] In addition, an indicator evaluation method for the blue-green fusion spatial model is provided.

[0037] like Figure 3 and Figure 4As shown, in one embodiment, a method for evaluating an index of a blue-green fusion spatial model includes the following steps:

[0038] Step S310, construct a sequential integration system integrating water bodies, land, and terrestrial and aquatic zones, and determine the evaluation index system from four levels: environment A, ecology B, society C, and economy D according to the fuzzy evaluation method. Through in-depth analysis of the research progress and characteristics of blue-green spaces at home and abroad, a sequential integration system integrating water bodies, land, and terrestrial and aquatic zones is constructed. Among them, the evaluation index system includes primary indicators and secondary indicators. Specifically, the construction of a sequential overall structure is based on the planning characteristics of urban blue-green spaces, the degree of integration of water bodies and green spaces, and the ecological planning goals. In this embodiment, the four levels of environment A, ecology B, society C, and economy D include eight primary indicators and twenty secondary indicators. Among them, the environmental A level includes three first-level indicators: water quality A1, water pattern morphology characteristics A2, and riverbank conditions A3; the first-level indicators of water quality A1 include the comprehensive pollution index A11; the first-level indicators of water pattern morphology characteristics A2 include four second-level indicators: river development A21, riverbed stability A22, flow rate conditions A23, and water volume conditions A24; the first-level indicators of riverbank conditions A3 include three second-level indicators: riverbank stability A31, ecotone sediments A32, and revetment types A33. The ecological B level includes two first-level indicators: biodiversity B1 and landscape diversity B2; the first-level indicators of biodiversity B2 include two second-level indicators: Shannon-Wiener index B11 and Pielou uniformity index (proposed by Pielou in 1966) B12; the first-level indicators of landscape diversity B2 include three second-level indicators: vegetation coverage B21, green accessibility B22, and ecological livability B23. The social C level includes two first-level indicators: social security C1 and social health C2; the first-level indicator of social security C1 includes three second-level indicators: drinking water quality safety C11, biological invasion threat C12 and ambient air quality index (AQI) C13; the first-level indicator of social health C2 includes two second-level indicators: residents' satisfaction C21 and health literacy C22. The economic D level includes the first-level indicator of ecological value D1; the first-level indicator of ecological value D1 includes two second-level indicators: landscape benefit D11 and cultural service income D12.

[0039] Step S320, determine the evaluation level and score of the secondary indicators according to the four levels of indicator evaluation content. Determine the evaluation level of the secondary indicators according to the four different levels of indicator evaluation content, namely, environment, ecology, society, and economy, divide each indicator into levels, and each level corresponds to a different score to determine the score. Describe the secondary indicators:

[0040] Comprehensive pollution index A11: The water pollution situation can be evaluated by statistical values. The degree of water pollution in different river sections can be compared spatially, which is convenient for classification and grading. It can also indicate the overall trend of water pollution in a river section or a region in time. Comprehensive pollution index A11≤0.40 means good water quality; A11=0.41~0.70 means slightly polluted water; A11=0.71~1.00 means moderately polluted water; A11=1.00~2.00 means heavily polluted water; A11≥2.00 means seriously polluted water.

[0041] River development situation A21: represents the development and utilization of urban rivers in the process of urbanization, which is divided into: no channelization and siltation, the river remains in a natural state; there is a small amount of widening and deepening of the river, and there is no obvious channelization; there is partial channelization, and dams are built on both sides; serious channelization, dams are built on both sides, and the riverbed is not channelized; serious channelization, the riverbank and riverbed have been channelized, and the habitat in the river has been greatly changed. Five levels indicate the degree of river development.

[0042] Riverbed stability A22: One of the important characteristic parameters used to analyze the evolution of the riverbed of an impact river. It is divided into three levels for qualitative evaluation: no obvious riverbed erosion or siltation, the riverbed is stable; moderate degradation or siltation, the riverbed is relatively unstable; severe degradation or siltation, the riverbed is extremely unstable.

[0043] Flow rate condition A23: It is used to indicate the effect of hydrodynamic factors on the degree of eutrophication of water bodies. A large flow rate of water bodies has a certain effect on water purification. It is divided into three levels: a certain flow rate, uneven flow rates in each section; uniform flow rate, no change in flow rate in each section; no flow of water bodies, or isolation from other rivers.

[0044] Water volume condition A24: It is closely related to the strength of the water body's self-purification ability and can be divided into five levels for evaluation: the water level reaches both banks with no exposed bottom; the water level reaches both banks with only a small amount of exposed bottom; the water covers 75% and the bottom is exposed <25%; the water covers <25% and most of the shallows are exposed; there is very little water and almost all of the bottom is exposed.

[0045] Riverbank stability A31: It is an important criterion for evaluating the health of riverbanks and has a great impact on biodiversity. It can be divided into five levels: stable riverbank, no obvious erosion; stable riverbank, erosion area <20%; relatively unstable riverbank, erosion area of ​​20% to 50%; unstable riverbank, erosion area of ​​60% to 80%; dangerous during floods, extremely unstable riverbank, erosion area >80%.

[0046] Ecotone Sediment (SQI) Index A32: reflects the suitability of the sediment environment for human survival and reproduction as well as social and economic development, and refers to the degree of pollution of the sediment environment. It is divided into five levels: SQI < 0.5, excellent sediment environment; 0.5 ≤ SQI < 0.75, clean sediment environment; 0.75 ≤ SQI < 1.0, slightly polluted sediment environment; 1.0 ≤ SQI < 1.25, moderately polluted sediment environment; SQI ≥ 1.25, severely polluted sediment environment.

[0047] Bank protection type A33: The degree of shoreline damage is determined by the change rate of natural shoreline length L, where L ≥ 0% is excellent; -3% ≤ L < 0% is good; -11% ≤ L < -3% is fair, or slightly degraded and damaged; -20% ≤ L < -11% is poor, or moderately degraded and damaged; L < -20% is extremely poor, or severely degraded and damaged.

[0048] Shannon-Wiener Index B11: Because it is most sensitive to the number of phytoplankton community species and has a good expression of phytoplankton community diversity, it has become the most widely used diversity index for water quality evaluation. It is divided into five levels: B11>3.5 is the cleanest; B11=2.5~3.5 is clean; B11=2.0~2.5 is lightly polluted; B11=1.0~2.0 is moderately polluted; B11<1.0 is heavily polluted.

[0049] Pielou evenness index B12: It can reflect the evenness of the distribution of the number of algae individuals and is divided into three levels for evaluation: 0-0.3 for heavy pollution, 0.3-0.5 for medium pollution, and 0.5-0.8 for light pollution or no pollution.

[0050] Vegetation coverage rate B21: It is an important indicator reflecting vegetation resources and greening level. It is divided into five levels for evaluation: B21 < 5%, bare land; B21 = 5% to 25%, low coverage; B21 = 25% to 50% medium-low coverage; B21 = 50% to 75%, medium coverage; B21 > 75%, high coverage.

[0051] Green accessibility B22: It is the possibility of contact with nature expressed by the time t that local residents take to reach parks and other green spaces. It can be divided into five levels: t<5min; t=5~10min; t=10~20min; t=20~30min; t>30min.

[0052] Ecological livability B23: It is evaluated using the Ecological Environment Index (EI), which is divided into five levels: EI ≥ 75 is excellent, with high vegetation coverage, rich biodiversity, and a stable ecosystem; EI = 55-75 is good, with high vegetation coverage, rich biodiversity, and suitable for human life; EI = 35-55 is fair, with medium vegetation coverage, an average level of biodiversity, and is more suitable for human life, but there are restrictive factors that are not suitable for human life; EI = 20-35 is poor, with poor vegetation coverage, severe drought and little rain, fewer species, and obvious factors that restrict human life; EI < 20 is poor, with harsh conditions and restrictions on human life.

[0053] Drinking water quality safety C11: It is evaluated based on the ratio of urban and rural residents with safe drinking water to the total population, r, which can be divided into five levels: r>90%, r=75%~90%, r=50%~75%, r=25%~50%, r<25%.

[0054] Biological invasion threat C12: It is used to characterize the degree to which the ecosystem is disturbed by alien species. It can be judged by the number of alien invasive species and is divided into five levels: no alien species; the alien species population is extremely small and is a rare species; the alien species population is very small and is uncommon in wetlands; the alien species population is large and relatively common; the alien species population is large and has threatened other species in the wetland.

[0055] Ambient Air Quality Index C13: Based on the ambient air quality standards and the impact of various pollutants on human health, ecology and environment, the concentrations of several air pollutants that are routinely monitored are simplified into a single conceptual index value. It can be divided into five levels: C13≤100, good air, people can carry out normal activities; C13=100~150, light pollution, residents have a small probability of irritating diseases; C13=150~200, moderate pollution, residents have a medium probability of irritating symptoms; C13=200~300, heavy pollution, residents generally have irritating symptoms; C13>300, severe pollution, residents should not go out for activities.

[0056] Residents’ satisfaction C21: represents residents’ satisfaction with community welfare, facilities, safety, etc., and can be divided into five levels: very satisfied, very satisfied, relatively satisfied, relatively dissatisfied, and dissatisfied.

[0057] Health literacy C22: refers to an individual's ability to obtain and understand health information, and use this information to maintain and promote their own health. It is analyzed through a resident literacy evaluation survey and is divided into five levels: excellent, good, better, average, and poor.

[0058] Landscape benefit D11: refers to the proportion of income p brought by tourism such as amusement facilities, scenic area catering projects, etc., which is evaluated at five levels: p>40%, p=30%~40%, p=20%~30%, p=10%~20%, p<10%.

[0059] Cultural service income D12: refers to the income from cultural and creative peripheral products, which is evaluated at five levels: D12>500,000 yuan / year, D12=400,000 to 500,000 yuan / year, D12=250,000 to 400,000 yuan / year, D12=100,000 to 250,000 yuan / year, and D12<100,000 yuan / year.

[0060] Table 1 is the blue-green space element level evaluation table.

[0061]

[0062]

[0063]

[0064] Table 1

[0065] Step S330, establish evaluation criteria, calculate the total score according to the different scores of the secondary indicators, apply the hierarchical analysis method to determine the weights and conduct analysis, determine the final ecological health level, and make a comprehensive evaluation.

[0066] First, a hierarchical model is established. The hierarchical model includes the target layer, control layer, criterion layer and indicator layer. Among them, the blue-green integration indicator evaluation system is the target layer, the four levels of environment A, ecology B, society C, and economy D are the control layer, the first-level indicator is the criterion layer, and the second-level indicator is the indicator layer.

[0067] Secondly, construct a judgment (paired comparison) matrix. The judgment matrix is ​​constructed using the hierarchical analysis method, and the secondary indicators at the same level are selected. The relative importance of the secondary indicators is evaluated by pairwise comparison to form the indicator M of the evaluation matrix.

[0068]

[0069] In the formula, C n are m factors in the indicator layer, r mn is the comparison result of the importance of the i-th secondary indicator to the j-th primary indicator (the value is obtained using the nine-scale method, and the judgment method is shown in Table 2).

[0070] Scale meaning 1 Indicates that two factors are equally important. 3 Indicates that one factor is slightly more important than the other factor. 5 Indicates that one factor is significantly more important than the other factor when compared with the other factors. 7 Indicates that one factor is more important than the other. 9 Indicates that one factor is extremely more important than the other. 2，4，6，8 The median of the two adjacent judgments above reciprocal <![CDATA[Judgment a for comparing factor i and j ij , then the judgment a for comparing factor j and i ji = 1 / a ij >

[0071] Table 2

[0072] Again, calculate the full sorting weight vector and perform consistency check. Calculate the maximum eigenvalue and its corresponding eigenvector for each pairwise comparison matrix, and perform consistency check using consistency index, random consistency index and consistency ratio.

[0073] Then, the total ranking weight vector is calculated and consistency check is performed. The weight vector of the total ranking of the bottom layer to the top layer is calculated. The total ranking consistency ratio is used for testing. Table 3 shows the total ranking results of the blue-green space indicator evaluation system.

[0074]

[0075]

[0076] Table 3

[0077] Finally, the final comprehensive evaluation result is obtained based on the weight of each indicator layer and the score of the grade evaluation table. Table 4 is the comprehensive evaluation grade table.

[0078]

[0079]

[0080] Table 4

[0081] According to existing research findings at home and abroad, although there is no evaluation system for the integration of water and green, there are comprehensive evaluation methods for water green spaces, such as hierarchical analysis method, principal component analysis method, fuzzy comprehensive evaluation method, cluster analysis method, grey comprehensive evaluation method, etc.

[0082] The analytic hierarchy process is a commonly used method in riparian ecosystem assessment. Its disadvantages are that the data statistics are large, the weights are difficult to determine, and the precise calculation of eigenvalues ​​and eigenvectors is relatively complicated.

[0083] The principal component analysis method constructs a comprehensive evaluation index based on the variance contribution rate of each main factor that makes up the index as a weight. The disadvantage is that factor analysis has requirements on the sample size. The ratio of sample size to the number of indicators should generally be above 5:1 to obtain better results. The weight determined by this method belongs to the information weight and does not fully consider the relative importance of the indicator itself.

[0084] Fuzzy comprehensive evaluation method is to divide some uncertain problems by using the basic theory of fuzzy mathematics and combining the principle of fuzzy relationship synthesis. The disadvantage is the difficulty of weight confirmation and the ambiguity of the relationship between statistical data of indicators.

[0085] Cluster analysis is based on the principle of "birds of a feather flock together". It collects data based on similarities and classifies them, so as to achieve the purpose of analyzing the inherent characteristics and laws of things. The disadvantage is that when the sample size is large, it is difficult to obtain clustering conclusions.

[0086] Grey comprehensive evaluation method is a factor analysis method in grey system theory. It believes that the closer the geometric shapes of the curves composed of multiple statistical series are, the closer the changing trends are, and the greater the correlation is. The disadvantage is that the white weighting function is difficult to determine.

[0087] The above-mentioned spatial model and indicator evaluation method applicable to the integration of blue and green take water bodies and land as a whole of an urban ecosystem, coordinate them into the blue-green space planning, and evaluate indicators at four levels: environment, ecology, society, and economy. The evaluation indicators are quantified, and the improvement is from quantitative change to qualitative change. The evaluation results are indicated by scientific data. After data integration through methods such as hierarchical analysis, a model for the spatial planning of blue-green integration and an evaluation system for the spatial structure and ecological function of blue-green integration are created. The evaluation results can reflect the coordination between the integration of water and green in urban planning and the lives of local residents, and provide scientific and technological support for the planning and design of blue-green space.

[0088] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for evaluating the index of a blue-green fusion spatial model, characterized in that: The spatial model of blue-green integration includes a green space, a water-land ecotone and a blue space, wherein the water-land ecotone connects the green space and the blue space and is located between the green space and the blue space, and the horizontal height of the green space is greater than the horizontal height of the blue space; The indicator evaluation method includes the following steps: Construct a sequential integration system integrating water bodies, land, and terrestrial and hydrozonal zones, and determine the evaluation index system from the four levels of environment, ecology, society, and economy based on the fuzzy evaluation method; wherein the evaluation index system includes primary indicators and secondary indicators; Determine the evaluation level and score of the secondary indicators according to the evaluation contents of the four levels of indicators; Establish evaluation criteria, calculate the total score based on the different scores of the secondary indicators, apply the analytic hierarchy process to determine the weights and conduct analysis, determine the final ecological health level, and make a comprehensive evaluation; The environmental level includes three first-level indicators: water quality, water pattern morphology characteristics and riverbank conditions; the first-level water quality indicator includes a second-level indicator of comprehensive pollution index; the first-level water pattern morphology indicator includes four second-level indicators of river development, riverbed stability, flow velocity and water volume; the first-level riverbank conditions indicator includes three second-level indicators: riverbank stability, interlaced zone sediments and bank protection types.

2. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The steps of constructing a sequential integration system integrating water bodies, land, and terrestrial and hydrozonal zones include the following steps: The construction of the sequential integration system is based on the planning characteristics of urban blue-green spaces, the degree of integration of water bodies and green spaces, and ecological planning goals.

3. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The ecological level includes two first-level indicators: biodiversity and landscape diversity; the first-level biodiversity indicator includes two second-level indicators: Shannon-Wiener index and Pielou evenness index; the first-level landscape diversity indicator includes three second-level indicators: vegetation coverage, green accessibility and ecological livability.

4. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The social level includes two first-level indicators: social security and social health; the first-level social security indicator includes three second-level indicators: drinking water quality safety, biological invasion threat and ambient air quality index; the first-level social health indicator includes two second-level indicators: resident satisfaction and health literacy; the economic level includes the first-level ecological value indicator; the first-level ecological value indicator includes two second-level indicators: landscape benefits and cultural service benefits.

5. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The step of applying the analytic hierarchy process to determine the weights comprises the following steps: Building a hierarchical model; Construct a judgment matrix; Calculate the full sorting weight vector and perform consistency check; Calculate the total sorting weight vector and perform consistency check; The final comprehensive evaluation result is calculated based on the weight of each indicator layer and the score of the grade evaluation table.

6. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The green space is a space covered and enclosed by vegetation, and includes parks, residential green spaces, road green spaces, production protection green spaces and woodlands. The production protection green space is located on the side close to the terrestrial and water-land ecotone. The park borders the production protection green space and is located on the side of the production protection green space away from the terrestrial and water-land ecotone. The woodland borders the park and is located on the side of the park away from the production protection green space. The road green space borders the woodland and is located on the side of the woodland away from the park. The residential green space borders the road green space and is located on the side of the road green space away from the woodland.

7. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The land-water transition zone is a transition zone for material transmission, energy conversion and information exchange between land and water. The land-water transition zone includes hard coastline, ecological coastline and waterfront green space. The hard coastline borders the ecological coastline and is located between the green space and the blue space with the ecological coastline. The waterfront green space is located within the ecological coastline.

8. The index evaluation method of the blue-green fusion spatial model according to claim 1 is characterized in that: The blue space includes a complex space composed of wetlands, waterfront green spaces and blue corridors, and the blue space includes rivers, reservoirs, lakes and ponds.

Images