| With the acceleration of urbanization,the properties of urban underlying surface have changed greatly,and the urban drainage pipe network system is under great pressure.Under the condition of heavy rainfall during the flood season,waterlogging is easy to occur at the low urban terrain,leading to casualties and irreparable loss of social property.Meanwhile,in recent years,due to the development of the Internet,the accuracy of data is gradually improved and the interaction of information becomes more and more frequent.Based on this,this paper carries out research on the causes of urban waterlogging,and on the basis of the research on the causes of waterlogging,uses the Storm Water Management Model(SWMM)to build a waterlogging depth simulation model.The main research contents are as follows:(1)Based on the data platform of Guangzhou,collect all kinds of urban waterlogging data,namely waterlogging water data,underground liquid level data,river water level data and rain measuring station data,and process all kinds of data,analyze and screen unreasonable data,delete unreasonable data series,and use interpolation method to complete the missing data.At the same time,the data of drainage pipes,manholes,rainwater outlets,dark spots of pipelines,topography and land use types of Guangzhou were collected to generalize the pipeline model of Guangzhou,and the physical and empirical parameters of the catchment area were calculated to obtain the drainage model of Guangzhou.(2)Put forward the analysis method of waterlogging causes based on real-time monitoring data.The small rainwater catchment grid units are divided according to the storm water outlet,storm water inspection well,discharge outlet,pipe network topology and flow direction.On this basis,the topological relationship of waterlogging is formed by the correlation of waterlogging point,underground level monitoring station,discharge outlet and river water station.Based on the real-time monitoring data,the water collecting capacity of the collecting well,the flow capacity of the pipeline,and the flow rate of the rainstorm were calculated.The causes of each waterlogging point were identified according to the filling degree of the pipe network,and different waterlogging measures were given for different waterlogging causes.The results showed that 75% of waterlogging cases involved insufficient surface drainage capacity,57.7% of waterlogging cases involved watercourse top support,and 44.2% of waterlogging cases involved excessive rainfall intensity and insufficient drainage capacity of pipe section.(3)Urban waterlogging model is the main technical means to simulate urban waterlogging water at present.However,the precision of urban waterlogging model is not high and complicated at present.Therefore,it is urgent to establish a simple and accurate waterlogging model.Therefore,based on SWMM one-dimensional model,a waterlogging model was established for the historical waterlogging points in Haizhu District,Guangzhou,and a new concept of waterlogging point storage curve was proposed to realize the simulation analysis of the depth of urban waterlogging.The results show that the average error between the measured maximum water depth and the simulated maximum water depth is 5.41%,and the grade of water is completely consistent.This model simplifies the traditional complex two-dimensional surface model,transforms the influence of rainstorm on waterlogging points into the relationship between rainstorm and pipe network,and reduces the amount of calculation.And can accurately infer the waterlogging grade and waterlogging depth,to achieve the waterlogging depth simulation.At the same time,according to the short rainfall data,waterlogging forecast,combined with waterlogging analysis system,give the corresponding waterlogging measures. |
