Optimization Of Urban Green Space Layout Based On The Improvement Of Surface Runoff Quality

China’s water problem is becoming more and more serious,urban built-up areas often face rain and flood disasters,water pollution and other problems.The construction of garden green space not only carries the functions of leisure and greening,but also needs to face many contradictions and problems between people and environment in modern cities.But in reality,urban surface runoff often does not pass through the green space or a small amount of green space,and is generally discharged directly through the pipe network.As a natural sponge,urban green space system has a good absorption effect on urban surface runoff.We should make good use of the strong absorption effect of green space on runoff,and let the green space have a good absorption effect on surface runoff through reasonable optimization of green space layout Therefore,based on the reality of our country,this paper mainly focuses on the problem of rainwater runoff pollution,and explores the improvement of surface runoff quality through the optimization of green space layout in the city.Starting.from.the.relevant.theoretical.basis,this.paper.Combs.the.development process of.rain.and.flood.management,urban surface runoff and urban green space layout at home and abroad,so as to clarify the ideas for the further development of our country.Through.a.variety.of.research.methods.such.as.qualitative.research.and.quantitative research,.this.paper.analyzes.the.characteristics.of.urban.surface.runoff.quality.and t.he landscape.pattern.index.of.urban.green.space.layout.in.detail,.and.sets.the optimization objectives and puts forward the optimization strategies,and carries out empirical research through software simulation.This.paper is mainly.divided..into.four.parts:.the first part is the introduction.of the relevant..theoretical..basis..and..the..literature.review.of.the research..status..at home.and abroad,to clarify the development process and future development ideas of urban green space layout related to surface runoff quality;the second part is the correlation analysis of urban surface runoff quality and green space layout,through the.literature.retrieval.method This.paper.summarizes.the.characteristics.of.surface.runoff.water.quality,.including.runoff process.and.characteristics,.pollutant.causes.and.characteristics,.surface runoff water quality evaluation,analyzes the characteristics and suitability of commonly used runoff pollution low impact development measures,summarizes the content elements of urban green space layout,and summarizes the index changes of green space optimization in current urban renewal from the perspective of landscape pattern analysis In the third part,the optimization objectives are put forward from two aspects of water quantity and water quality,and then the optimization strategies of urban green space layout based on the improvement of surface runoff quality are put forward from two different scales of area and site;in the fourth part,Qingyang District of Chengdu is taken as an example to conduct empirical research and fully investigate the field According to the current situation of green space layout,the surface runoff pollutant concentration under field rainfall is obtained through actual measurement,and the cumulative amount of pollution load is estimated through the concentration method.Suggestions for green space optimization are put forward,and the pollution load of optimized green space layout is simulated and verified by using load calculator software.This.study.aims.at.improving.the.quality.of.urban.surface.runoff.water,.and.puts..forward.the.optimization.planning.objectives.and.approaches.of.green.space.layout.from.the.perspective.of.water.quality,.hoping to expand the current theoretical system of green space system planning and construction,and introduce more ecological reference factors for urban planning and construction,And hope to improve the methods and ways of green space layout,realize the utilization of rainwater resources and the promotion of comprehensive benefits of garden green space.