The Study Of Urban Design Optimization Method Based On Healthy Hydrological Cycle Concept In Hepanshuixiang District

The urbanization construction brought about the rapid changes in urban hydrological environment,by the construction of buildings,paving and other artificial surface of the city hardened space,the infiltration evaporation and confluence process of water has been cut off,bringing the problems of water quality,water ecology and other issues in the city.The troditional way to deal with hydrological problems in urbanization was to construct drainage pipelines and end treatment facilities,which makes the hydrological process completely isolated from urban space,and the hydrological problems becoming more and more serious.Influenced by the development of low-impact ideas aboroad,scholars at home and abroad have begun to study the planning strategies of urban hydrological problems,and reflected on the lack of systematic analysis of the natural hydrological cycle in traditional urban planning methods.However,in the construction boom of sponge city in China,more focus has been put on engineering technology rather than planning,the research of urban design method of urban hydrological process remained to be explored.Taking Hepanshuixiang Area in Panjin as the research object,this paper introduced the concept of healthy hydrological cycle,exploring the spatial structure of Riverside Waterfront Area under the concept.Based on the analysis of health hydrological cycle and the correlation analysis of water flow and vapor flow process with urban spatial elements,it defined the spatial design objectives of healthy hydrological cycle according to the natural hydrological basement conditions of Hepanshuixiang Area,respectively,from the three objectives of water ecology,water security and water comfort,it explored the corresponding hydrological spatial level of urban hydrological pattern construction and spatial morphology design method.Firstly,based on the objective of water ecology,the hydrological spatial structure of sub-watershed has been constructed.By using the surface runoff simulation method based on GIS,the important hydrological processes such as rainfall runoff,surface runoff and river confluence were simulated to identify key hydrological adjustment regions.Through the integrated control of rainwater ecological corridor,wetland purification system and green space network system,the system of water cycle ecological pattern with point,line and surface was constructed,and the overall hydrological spatial structure based on the aim of water ecology was formed,which was conducive to ecological flow and water purification.Secondly,based on the objective of water security,the site layout of hydrological unit has been optimized.Based on the SWMM model simulation,the quantitative control results of building density,road density,green density and pavement density were determined to control the permeable area of the underlying surface.Based on the relationship between runoff process and site elements,the site layout of buildings,roads and green land to optimize the water permeable was defined,through the comparison of the total amount of runoff under the same rainfall return period of before the development,the planning scheme and the optimization scheme,the target value of the runoff needed by the rainwater facilities at the site was determined,and the rainwater facilities layout scheme was completed.Finally,based on the objective of water comfort,the waterfront spatial morphology has been determined.The microclimate simulation technology of phoenics was used to analyze the characteristics of the water environment elements in the waterfront space of the hydrologic unit.The location of the water environment factors affecting the microclimate regulation was identified and optimized.Based on the simulation results,improvement advice and optimization strategies was applied to ventilation corridor,waterfront greenbelt and waterfront buildings,to maximize the micro-climate adjustment range of water body,and improve the water comfort the waterfront environment.Based on the concept of healthy hydrological cycle,this paper studied the relationship between urban spatial elements such as water system,green space,building,road and hydrological cycle,and explored the spatial implementation and integration based on the aims of water ecology,water security and water comfort.,which provided realistic basis to the urban design strategy in Hepanshuixiang Area.