Research On Urban Stormwater Control Scheme Based On Model

The harmonious development of human society has objective requirements for the natural ecological conditions.The unreasonable urban construction mode makes the human being be gradually attacked by nature:Global climate change and urbanization process increase the frequency of sudden rainstorms,and the urban construction mode of relying on mountains and rivers makes flood disasters increasingly threaten the normal social activities of human beings.Rainstorm and flood occur year after year,and the types show diversity,causing significant economic losses to cities.The current situation of frequent rain floods makes every country and region realize the importance of scientific and reasonable design of urban drainage system.Relevant documents of the state council require that the city construction process should actively implement the concept of sponge city of natural infiltration,purification and accumulation of rainwater,to restore urban water ecology,enhance urban flood prevention capacity,achieve the goal of harmonious coexistence of people,water and city,and achieve higher quality and more sustainable development.Nowadays,the construction of sponge city has risen to the height of leading the development concept of various construction undertakings.It is widely practiced in many areas.Shenzhen,as a national pilot city of sponge city construction,is also actively implementing the concept of sponge city.This paper takes shenzhen national independent innovation demonstration zone–Bao Long science and technology city as the research object.First using Arc GIS tools for urban water system,biological and geological sensitivity analysis of spatial characteristics,will be the results of the analysis is used to make up for the inadequacy of relevant planning combined with the present situation of land utilization,land value and transforming the difficulty will study area is divided into two core and non-core area level,put forward according to the spatial characteristics of local conditions,formulate the rain flood control scheme.After comprehensive analysis of regional flood problems and the current situation of drainage facilities,the coupling relationship between"grey"and"green"rainwater infrastructure is controlled^[1],and the deficiency of regional drainage capacity is clearly recognized;After that,through the research of SWMM and Mike Flood models,the characteristics of each model are elaborated and relevant processing methods are proposed to reduce the operation errors of the model;After that,Mike Flood model was adopted to simulate the current Flood problem in the region,and the waterlogging risk distribution map was obtained.In combination with historical waterlogging points and simulation results,the solution goal was defined;Finally,corresponding solutions are developed from the two levels of"small sponge"and"big sponge"for the flood problem simulated by the regional status model.Among them,the establishment of"small sponge"system is to solve the problem of light rain runoff in the core area,and the main approach is to make the hydrological characteristics of the high built-up area close to the pre-development state through the construction of low-impact development facilities.Then through SWMM model,the total runoff control target in"small sponge"area is decomposed layer by layer,and the control indicators of each control unit are verified.The establishment of"big sponge"system is to solve the flood problem in non-core areas,and the main way is to ensure the water security of the whole region by the pipe network system and water conservancy facilities.Mike Flood model is a supplement and upgrade of SWMM model to make up for the shortcomings of SWMM in simulating hydrological process.In the research process,this model is used to assist in diagnosing the time,place and scope of urban Flood during rainstorm,so as to verify the effect of rain Flood control scheme.