Measurement And Evaluation Of Compact Settlements In LID Perspective

With the advancement of urbanization process in China,development and construction of the settlement is at a stage of rapid intensification,which is damage to the natural environment around the city in somehow.Meanwhile,the original land surface properties was changed by urban development which made the land surface environment suffering damages,the city's hydrological and rainfall flood safety is not guaranteed,and the urban problems such as waterlogging appeared.Living as the most important functions in city,residential land shares the majority of city land.Building "compact settlements" is urgently important for cities.Compactness is an important factor that affects compact settlements.Therefore,the compactness of "compact settlements" is the problem needs to be solved by this paper which tries to balance economic development and natural environment.Based on the literature reviews and researches,this paper established a settlements compactness measurement and evaluation system by building the minimum development model,to discuss the function of improvement in settlement environment and saving city land and quantitatively analysis the basic regularity of the comprehensive compactness under the ideal settlement model.This paper argues that:compactness measurement and evaluation of the settlement need to be focused on the "compact settlement".A highly compactness settlement,reflects high volume,high building density and high population density.By increasing the spatial density of settlements,to realize improving the compactness of settlement and the efficient of land-use,to achieve the goal that is harmonious development between environment and settlements.Traditionally,settlement environment evaluation equals community environment evaluation,it is judged by evaluating the numerical of per capita land area and the per capita green area;However,based on LID,the assessment of the affection in settlement development to hydrology environment,is the new direction to this study.By comparative analysis of rainwater utilization in residential development,this paper tend to evaluate the site hydrology natural environment.Finally,by comprehensive measurement and evaluation in compact settlements of measurement and living environment based on the LID,to obtains the compact settlements of the basic regularity.The last chapter takes realizing settlement to be compact as the goal,compact settlements philosophy as a guide,to explore and test the compact settlements development model testing practically.The research result shows that the compactness of settlement has been improved significantly,and the comprehensive benefit between community environment and economic development also has been improved,which indicates that the research program and system of this paper is effective.