Simulition Research On The Effect Of Runoff Storage Facilities On Flood Control

In recent years,global climate change has led to freq ue nt floods caused by extre me rainfall,rainwater has become a major security risk.China is one of the countries with frequent water disasters.Therefore,solving the flood problem is a major social need in China.As an important technical measure to control source pollution,storage facilities have been widely used.Practice has proved that the storage facilities has significant social,environmental and economic benefits and is an effective unification of the three.At present,the research of storage facilities mainly focuses on the reasonably determining the volume and economic benefit of storage facilities suitable for specific places.In order to further understand the impact of storage facilities on surface runoff,so as to optimize the storage facilities.This paper analyzes the response of the regulation capacity of the regulation and storage facilities to the slope,rainfall intensity and position change of the river c hannel through simulation.Meanwhile,the optimal analysis of the locatio n and arrangeme nt of storage and regulation facilities is made by selecting the demonstration area of sponge city construction in Xi Xian new area and Wangmao gou catchment,so as to provide some inspiration for the regulation and sto rage effect of lakes on urban waterlogging disaster,the theory of sponge city rainwater storage and regulation pond,and the reduction of catchment flood.The main work are as follows:1.Based on Xi'an University of Technology,the GAST Model(GPU Accelerated Surface Water Flow and Transport Model),on the basis of coupling storage facilities of the runoff module,by entering high resolution terrain data to characterize land use types on the basis of the basic parameters,by graphics acceleration operation,with the aid of this Model simulation analysis of the influencing factors of storage capacity storage facilities.2.GAST model is adopted to simulate and analyze the influence of storage facilities on the surface yield convergence process formed by rainfall;The model is verified by using the experimental platform of urban rain flood and analytical solutions of published journals.Based on the "V" type ideal watershed model,the factors affecting the storage capacity of the storage facilities are analyzed.Under the conditions of storage facilities and rainfall designed in this paper,different types of storage facilities can relieve 1.86%-15.91%of the maximum flood peak flow.The location change of storage facilities can reduce the maximum peak flow by 1.64%?20.29%.And:(1)It is obtained by the simulation results of different types of storage facilities for river catchment flood storage capacity in the process of size efifect,by adding sink the regulation effect of runoff points from flood flow and regulating peak time now for the effect is superior to the river flood detention facilities(2)with strong design rainfall increase,increasing the storage capacity of storage facilities(3)when the storage facilities for the entire watershed is located in the downstream,its storage capacity is the largest,(4)when the smaller the slope of the main channel,the stronger the storage capacity of storage facilities.3.Based on the topographic data,land use data,rainfall and discharge of outlet section in Wangmaogou catchment;By comparing the measured flood discharge data formed in the rainfall field on July 15,2012 with the simulation results,it is verified that the model can be used for flood simulation in Wangmaogou catchment.The flood process of the two schemes under the condition of single rainfall on July 15,2012 was simulated and compared with the measured flow at the exit of the catchment.Thus,under the two schemes of adding storage facilities,the peak flow can be reduced by 8.3%and 27.5%respectively.4.Take the 3.68km2 core demonstration area of sponge city construction in Xi Xian new area as the research area,and compare the urban waterlogging area and water depth formed by measured rainfall with the simulation results of the model in this paper to quantitatively verify the rationality of the model in this paper.According to the topographic elevation of the study area,the area is divided into upper and middle.In the downstream,lakes of different areas were set up at different locations of the region.Three kinds of quantitative data results,namely,the total amount of waterlogging,the area of waterlogging and the area of severe waterloging,were compared and analyzed by simulating three kinds of designed rainfall:large,medium and small.It is concluded that when the surface area of the lake in the study area decreases from 0.5024 km2 to 0.00785km2,the total water accumulation peak increases by 12.71%?18.21%,and the severe waterlogging area increases by 11.71%?25.66%.Lakes of different location of regional waterlogging the influence degree of each different,such as when rainfall return period of 100 years,the lake covers an area of 0.5024km2,the lake is located in the study collect the water upstream,midstream and downstream of severe waterlogging area 173460m2,169160m2 and 162628m2 respectively,namely when the storage capacity of lakes located in the downstream of the river basin is higher than the upstream and middle reaches.