Research On Low Impact Development Mode Of Sponge City For Jinan

As the rapid development of economy and society,and the demond of environmental sustainable development,the concept of sponge city and low impact development have been proposed and changed the development mode from taking consideration of economic benefits into a comprehensive environment-societyeconomy mode as the goal of sustainable development to adapt to the environment.Various environmental,social and economical factors affect the reconstruction plan of sponge city,that is to say,reasonable construction methods,appropriate implementation and stable performances really decide whether the expected goals of sponge city,low impact development and environmental adaptation can come true.In this article,the research situations of sponge city and low impact development,basic principles of construction and the optimization methods of different reconstruction schemes are firstly introduced.Then a sponge city case is combined,and several optimization methods of different reconstruction plans are compared and discussed.The study shows that the factors influencing the reconstruction of sponge city are interlinked.Grey correlation theory is applied to analyze the correlationship between various factors,and provides evidences for policymakers to decide the corresponding subjective weights.Applications of projection pursuit classification model,entropy coefficient evaluation model and principal component analysis model are involved in the engineering practice of sponge city retrofit optimization in Jinan.The evaluation results of three models are similar,and this is an evidence that these models are powerful tools to effectively solve the optimization problem of multiple factors.No subjective judgment of policymakers is added in projection pursuit classification model;therefore,the model can directly reflect the relationships hided in the original data.In the entropy weight coefficient model,it can be determined by human subjective weights of each factor.Principal component analysis is based on the inherent law of original data.Based on the related research of sponge city and low impact development in nowadays,this article proposes an optimization method of the actual project case in Jinan sponge city.Statistical analysis methods are introduced to solve the optimization problems and provides useful references for sponge city in future.