Study On The Rebuid And Design Model For Stormwater Control System Of Villages Around Dianshan Lake Based On The Theory Of Sponge City

Dianshan Lake is an important water resource protected area and ecological conservation.However,rainstorm problems in the villages around the lake such as water logging,runoff pollution,waste of water resource,imbalance of aquatic ecology caused by backward design concepts and construction modes have seriously impact on the sustainable development of this area.‘Sponge City' is a feasible system and instruction proposed on the basis of western theories and practice aiming at solving urban-rural rainstorm management.This thesis expands the practice of Sponge City from urban to rural area,which provides new ideas and methods to alleviate rainstorm problems in Dianshan Lake.From the perspective of enhancing the stormwater controlling ability of villages,this study acquires the rainstorm management status by the field investigation and analysis on 42 villages around Dianshan lake,and explores the rebuid and design model for stormwater control system of villages based on the theory of Sponge City,and its feasibility is demonstrated by a typical example.Specific content as follows:Investigation on the status of rainstorm management in the villages: Using 3S technique to get integrating statistical analysis on land-usage types and calculating runoff coefficient of villages.Analyzing the water quality and distribution features of runoff in the villages through sample test.Adopting Braun-Blanquet School's method to study the plant speices,community structure and typical community modes.Concluding 6 courtyard modes and 8 spatial distribution features of community modes as well as the general status quo of drainage system.The improvement design mode of village's rainstorm management and control system: Based on the theory of Sponge city and analysis on present problems of rainstorm management,this thesis comes up with the goal,principles,design concept apply to the villages.What's more,an improvement design mode for the rainstorm management and control system is built from the perspectives of spatial distribution,the choice of construction parameter and plant species as well as calculation methods.The analysis of typical villages' improvement: Take Xinyaoduan-a medium sized village with diversified spatial types as an example,this thesis applies the rebuild and design model of stormwater control system constructed above and proposes detailed distribution plan based on the village's land usage,runoff and spatial types.After estimating,the greening rate,regulation capacity and water recycling of Xinyaoduan has increased by 30.7% a,234.7% and 60%.Meanwhile,the Village's ability of pollution reduction is outstanding.