Research On Ecological Security Assessment And Ecological Security Pattern Construction Of Yanting Town Based On Resilience Concept

With the continuous promotion of China’s new urbanization construction,large-scale land expansion and changes will inevitably break the original ecological system structure of the region.As a typical township type that is highly susceptible to multiple disasters,coastal towns are severely affected by ecological problems caused by external disturbances,which seriously affect the sustainable development of urban economy and society.Accurately identifying and constructing an ecological security pattern from the perspective of resilient development is of great significance in proposing resilient optimization strategies for areas with prominent contradictions.Based on the literature study,the feasibility of resilience concept guiding the study of ecological security pattern was clarified.The resilience concept was introduced into the study of ecological security pattern.Taking Yanting Town,a coastal town,as the case study object,the GIS spatial analysis technology was used to build the ecological security assessment and comprehensive resilience ecological security pattern under the resilience concept.The corresponding resilience optimization strategies were proposed using the construction results.The main conclusions are as follows:(1)The ecological security assessment of coastal cities and towns under the concept of resilience was constructed by selecting 8 index factors from the four characteristic dimensions of resilience,namely diversity,stability,suitability and redundancy.Five evaluation grade results were obtained by using entropy method,Delphi method method and AHP method.The areas of high safety,high safety,critical safety and low safety were 2.09km~2,5.64km~2,5.91km~2and 1.02km~2,respectively,accounting for 14.26%and 38.47%of the total land area,40.31%and 6.96%,indicating that the resilient ecological security level of Yanting Town is in a critical safety state.Among them,the results of the high security assessment serve as the basis for extracting ecological sources for constructing the biological protection security pattern,while the spatial results of the other three security levels are combined with the current situation of the research area to diagnose ecological security issues.(2)Summarize the main ecological security issues faced by four types of coastal towns,and build a targeted four single ecological security pattern for Yanting Town under the concept of resilience.By using various methods such as SCS model,MCR model,and suitability evaluation,a resilient rainwater flood safety pattern is constructed from two aspects:the safety pattern of rainwater flood inundation and the safety pattern of water system protection.Five evaluation factors are selected from two aspects:natural ecological factors and engineering activity factors to construct a geological disaster safety pattern.A recreational protection safety pattern is constructed from two aspects:the suitability evaluation of recreational areas and the minimum cumulative resistance surface of recreational points.The ecological source area is extracted Constructing ecological resistance surfaces and identifying ecological corridors to build a pattern of biological protection and security.In the pattern of biological protection security,patches larger than 0.05km2 were selected from the high security evaluation level to determine 7 ecological source areas,accounting for 5.74%of the total area.21 potential ecological corridors were identified,and 6 important corridors were extracted using gravity models.(3)By overlaying four single ecological security patterns,a comprehensive resilient ecological security pattern was obtained with three levels of security patterns:bottom line,satisfactory,and ideal.The construction results showed that the bottom line security pattern covers an area of 4.93km~2,accounting for 33.63%,mainly distributed in Zhenxing Village;The satisfactory security pattern covers an area of 7.22km~2,accounting for 49.25%,making it the region with the largest proportion in the comprehensive resilient ecological security pattern results;The ideal security pattern covers an area of2.51km~2,accounting for 17.12%,which is the least significant part of the construction results and is mostly distributed near urban built-up areas.Based on further analysis of land use types,administrative village boundaries,and altitude ranges,a spatial structure layout model of"one center,one axis,two rings,and three areas"is proposed.(4)Based on the evaluation and construction results obtained above,an ecological resilience optimization strategy for coastal towns is proposed from three aspects:resilience control under different levels of security patterns,resilience adaptation under different ecological processes,and future sustainable development of smart resilience in coastal towns.Using the results of constructing a comprehensive resilient ecological security pattern,propose resilience control strategies that prohibit development in areas with bottom line security patterns,restrict development in areas with satisfactory security patterns,and reasonably develop areas with ideal security patterns;Using the results of four single ecological security patterns,propose resilience adaptation strategies such as"resistance absorption adaptation","defense adaptation repair","protection planning improvement",and"maintaining source areas reducing resistance corridor grading";Finally,utilizing the smart thinking platform and spatial structure layout,strategic suggestions and development guidelines for the future smart resilience development of Yanting Town are proposed.