The Study Of City Waterlogging Causes And Prevention Measures Based On Feature Analysis

In recent years,in order to study the problem of urban flood disasters,many scholars have made some achievements in the analysis of the causes of urban flooding and the analysis of the characteristics of flood disasters.However,in the present study,there is a lack of detailed study on the causes of flooding in urban stormwater pipe network system.Therefore,this paper starts from the research direction of feature analysis,and studies the rainwater pipe network factors in the causes of urban flooding.In order to further form a reasonable determination of the causes of flooding in urban stormwater pipe network system and to formulate suitable solutions,it provides standardized reference for rapidly locating the causes of flooding in stormwater pipe network.In this paper,a method for determining the causes of flooding in urban stormwater pipe networks based on feature analysis is proposed.This method includes four steps:flood location,attribution,problem retrieval and program formulation.The study area is simulated by hydrodynamic model combined with the measured data,so as to determine the location of waterlogged water.By sorting and summarizing the different topology and hydraulic characteristics of rainwater pipe network factors,the causes of waterlogging are classified as structural problems of pipe network and boundary problems of pipe network,among which the structural problems of pipe network include insufficient pipe overcurrent capacity,reverse slope,bottleneck pipe segment and pipe network loss,and the boundary problems of pipe network include river water level top support and stormwater mouth blockage.The causes of waterlogging in the rainwater pipe network with their own characteristics are combined with the Outdoor Drainage Design Specification(GB50014-2006)to form a scientific logical determination,which can quickly identify the connecting characteristics of the pipe segment at the waterlogged water location,analyze and explain the causes of overflow,and quickly lock the retrieval method of the causes of waterlogging.According to the Outdoor Drainage Design Code(GB 50014-2006)to develop the relevant transformation program,so that the transformation measures are well-documented.Among them,the structural problems of the pipe network are engineered,and the non-engineering measures are proposed on the boundary problems of the pipe network.Taking the stormwater pipe network system in an area of Beijing and a region of Guangzhou as the research object,the info Works ICM software is used to analyze the node overflow,pipe segment load,surface flood depth and flooding range of the stormwater pipe network system during different rainfall recurrence periods,and then evaluate the drainage capacity of the pipe network,determine the flood location of the stormwater pipe network,and use the method based on feature analysis to retrieve the different causes of waterlogging in the rainwater pipe network,and recommend targeted transformation measures.The effectiveness of the proposed method is verified by comparing the inundated area and the inundation range before and after the transformation of the rainwater pipe network in the region.The simulation results show that 47.45%pipe drainage capacity of the stormwater pipe network system in an area of Beijing is less than once in ten years,and the area of the pipeline overflow capacity and bottleneck pipe section is the main reason for the lack of drainage capacity,after targeted transformation,the area of inundated water is greater than0.15m is 4.04km~2,and the inundation area is reduced by 62.9%.Guangzhou City,an area of rainwater pipe network system 11%pipe drainage capacity is less than 50 years once,the cause of waterlogging in the lack of pipe network factors is the main reason for the lack of drainage capacity in the region,after targeted transformation,the depth of flooded water is greater than 0.15m area of 0.35km~2,inundated area reduced by 10.25%.The method proposed in this paper has a certain practical value,for different areas of the stormwater pipe network system,through the method of feature analysis,you can accurately get the location of each type of cause needs to be modified,the number of pipe segments to be modified,and for the cause of the transformation of the flooded area and range changes.A reasonable determination of the causes of flooding in urban stormwater pipe network system is formulated,so as to provide standardized reference for the rapid analysis of waterlogging events.