| Due to the combined effects of extreme climate and urban surface land use structure,the cities in the North China Plain are likely to cause local rain and flood disasters in the summer due to heavy rain.Considering that the current domestic and international urban stormwater research focuses on the analysis of rain and flood genesis,rain and flood runoff model prediction,rainwater flood control,and flood submergence(active and passive flooding),there is a lack of land for small elevation and land use.Specialized study on rain and flood in the plain area with complex structure.Therefore,exploring the distribution law of potential rain and flood areas in plain areas has become an important scientific issue for the sustainable development of cities in the plain areas.This paper selects the Haidian piedmont area in Beijing as an example to carry out rain and flood analysis,explores the distribution of urban rainwater and flood in the plain area,and provides theoretical and decision-making reference for better construction of ecologically healthy cities,land use optimization and urban land use planning.This paper selects the analysis of rainwater flooding in Beijing,which is located in North China,and explores the distribution of flooding points in urban plains and floods in the plain area,and provides decision-making reference for the optimization of ecological cities and healthy urban land use.The research focus of this paper is to take the mountain front area of Haidian as an example.According to the research purpose of this paper,the causes of urban rainwater,related theories and rainwater utilization model are used to summarize and sort out the current research on rainwater.In order to lay the foundation for the future research methods and content.Based on the high-resolution DEM(digital elevation model)generated by the elevation point of the Haidian piedmont area in Beijing,based on the ArcGIS software platform,the D8 algorithm in the hydrological analysis method was improved by Taudem,and the analysis of the Huishui River network was carried out.The potential rainwater distribution area is obtained and superimposed with the urban road and lake river map to further determine the potential rain flood distribution area;then the GIS function and grid method are used to process the land use status map in ArcGIS software,combined with the land use.The runoff coefficient is obtained,and the osmotic potential is obtained.The rainwater flood area obtained in the previous section is further corrected,and the potential rain and flood distribution area in the Haidian piedmont area is finally determined.Then,the main road map is superimposed and analyzed to determine the distribution position.Inspection.The main conclusions are as follows:1.This study determines the distribution of potential rainwater flooding areas in the study area by river network extraction analysis,permeability correction analysis and field verification analysis.2.Starting from the formation of "water supply" and "infiltration" of rainwater,the use of Taudem plug-in to improve the accuracy of catchment runoff and the use of grid method to obtain the comprehensive runoff coefficient in the study area,thus determining the regions The level of penetration ability,the corresponding quantitative results are obtained,and the relevant research is provided for reference.3.The frontier area of Haidian Mountain in Beijing is a high-incidence area for the formation of rain and flood.There are three main types of land use and topography: low-lying areas,roads and rains,and steep slopes to form rainwater.Rainwater flood control needs to optimize the land use structure,increase the joint construction of the infiltration facilities and underground space,enhance the drainage capacity of the city,and put forward opinions and suggestions for the need to re-plan and improve the area. |
