Research And Application Of Urban Rainstorm-flood Coupling Model

With the rapid advancement of urbanization,the city scale is expanding,the function system is becoming more and more complex,and all kinds of risks are becoming more and more prominent.Urban safety is facing severe challenges,among which the urban waterlogging caused by rainstorms is particularly prominent.In the face of a severe and complex urban security situation,it is urgent to have a more advanced concept of security development,more systematic risk management methods,and more intelligent technology application,to guarantee the stable and safe development of cities.Hydroinfo is a large-scale numerical simulation software developed by Dalian University of Technology for calculating complex water flow and transport problems.Based on the general hydrodynamic model Hydro Info and it’s cloud computing platform,the coupling model of urban rainstorm-flood is numerically simulated in this paper.Firstly,this paper reviews the research status and progress of urban rainwater problems at home and abroad from the hydrological model,hydraulics model,and hydro-hydrodynamic coupling model analyzes the existing problems at the present stage and puts forward the research content and technical route of this paper according to the existing problems.Secondly,this paper describes the Hydro Info and the calculation principle and discrete method used in this paper,which provides a theoretical basis for the realization of a complete urban rainstorm-flood coupling model in this paper.And through the rain perforated strainer physical model test of perforated strainer rainwater discharge capacity,the test data are summarized,to explore the different working conditions for the influence of the various type of grating rainwater discharge capacity,based on dimensional analysis summed up the entrapment efficiency formula,combined with the existing research and reference for standard measuring grating rainwater discharge capacity curve,It provides a reference for the determination of drainage coefficient in one-and two-dimensional vertical coupling models.Then,the one-dimensional,two-dimensional,and one-dimensional coupling models of the model were verified by the literature examples and the physical model test of rain grate,to ensure the reliability of the model.Finally,this chapter applies the previous coupling model method to the Wang Hu Cheng project in Hefei.Through the study on regional topography,land use,soil infiltration rate,hydrology and meteorology,rainfall data,etc were analyzed,and established a model of the channel,underground drainage pipe network model,the two-dimensional surface runoff model,and the mutual coupling between,at the same time,complete with rainfall-runoff hydrological elements urban rain flood coupling model.The simulation results of the model are analyzed,and the water balance analysis is carried out.Compared with the flood risk points,reasonable results are obtained,which proves the reliability of the coupling model in this paper.Furthermore,the design of stormwater storage scheme is carried out in view of the stormwater problem of Wang hu Cheng in Hefei,providing ideas and references for solving the stormwater problem of Wang hu Cheng.