Study On The Stormwater Management Assessment Of Urban Green Infrastructure Based On Landscape Pattern Analysis

With the rapid development of the urbanization in Chinese cities,the contradiction between human beings and the natural environment is increasingly prominent.However,the intensification of the urban surface hardness caused the frequent occurrence of urban waterlogging disasters,which not only caused adverse environmental impacts,but also affected people’s production and life,as well as public property safety.Since China’s "twelfth five-year",the government advocate the construction of urban ecological civilization,taking the path of sustainable development and put forward "sponge city" construction requirements in 2014,which raise concern and attention to the water environment comprehensive treatment among various professional fields.Since sustainable water environment proposition is a comprehensive and interdisciplinary research,this study proposed from the perspective of landscape architecture discipline.To taking the spatial pattern of urban green infrastructure as the breakthrough point,and discuss about the stormwater management function and influence of urban green infrastructure in,as an important urban ecological skeleton.The research is based on the urban spatial structure,and explores the assessment methods of urban green infrastructure stormwater management.The assessment framework is mainly divided into two aspects.On the one hand,based on the theory of landscape ecology,define urban green infrastructure as "patch-corridor" pattern.Then,select the suitable assessment indexs,to quantitatively assess the landscape spatial pattern of urban green infrasturcture.On the other hand,first,use the Analytic Hierarchy Process and Delphi methods,to build the stormwateer management assessment index system and access the index weight;second,analyze and judge the stormwater management technolog;third,apply the weight distribution according to the the urban green infrastructure with its suitable stormwater management technology;finally,obtain the assessment results of various types of urban green infrastructure on stormwater management function.Along the study process,use a variety of research and assessment methods to conduct quantitative and qualitative analysis,and also have the aid of computer software,such as the yaahp software,the Fragstats and the ArcGIS.After the building of assessment method and framwork,an empirical study was carried out in Guangzhou Haizhu Eco-city in the Pearl River Delta region of China.Through the analysis of the basic conditions,it is believed that the research area is suitable to implement modern stormwater management concept and technology based on urban green infrastructure.Have a comparative study of the study area in four periods by using the assesment method,and combine the urban spatial pattern assessment of green infrastructure with the stormwater management on four aspects,including the technical features,the environmental impact and the economic impact and the social impact.Based on overall analysis and assessment,put forward the comprehensive strategies that the spatial pattern of urban green infrastructure should imporve in four aspects,including increase the amount of green space,slow down the landscape fragmentation,strengthen the layout balance and improve the patch connectivity.In addition,four key research areas with obvious patch changes were selected,and more specific guidance strategies were put forward towards the types of patch,the layout structure and the suitable stormtater management techniques.The study aims to put forward a synthetical and regional assessment method towards the stormwater management function of urban green infrastructure,and then based on the evaluated anlysis and result to propose more specific planning strategy.