Research On Waterloggin Simulation And Dfainage And Waterloggin Removal Effect Of Typical Urban Area Based On MIKE Model

In recent years,with the continuous acceleration of urban development,the global warming trend has triggered frequent extreme rainfall events,leading to flood disasters in many Chinese cities,which has brought huge losses to the people and the country.How to better alleviate urban waterlogging disaster has become an important problem to be solved at present,and the key to prevent urban waterlogging disaster lies in the accurate and comprehensive simulation and prediction of urban hydrological process.Based on this,this paper takes Xi’an University of Technology Jinhua Campus as the research object to construct Mike Urban Model,Mike21 Model and Mike Flood Coupling Model to evaluate the current pipe network capacity and surface water situation in the research area.According to the evaluation results,two short-term emergency schemes and long-term sustainable schemes were designed for the pipe network and the surface type respectively,and the improvement level of pipe network capacity and waterlogging reduction effect of each scheme under the conditions of rainfall in different return periods were analyzed with emphasis.The main research conclusions are as follows:(1)Based on the basic data of the study area,Mike series models are constructed.The parameters are continuously adjusted based on the measured pipeline flow data and surface water logging data.The results show that the flow hydrograph and water logging simulation values meet the error requirements of ± 15%,20min and 20%,and the model has good prediction accuracy.(2)According to the simulation analysis results of drainage capacity and surface water under current conditions of the model,with the increase of return period,the number of overflow nodes and the length of filling degree of the drainage pipe network increased.The length of the drainage network whose drainage capacity was less than once a year accounted for 91.66%of the total length,and the drainage capacity was seriously insufficient.There is no higher risk level for surface water in the study area.Most areas are at low risk level,while the southwest area is at medium risk level.(3)According to the current status assessment results,two pipeline network renovation schemes and two LID "green" schemes are formulated respectively.According to the simulation results,among the pipeline network renovation schemes,the two schemes can improve the drainage capacity of the pipe network system to different degrees,and the node overflow is reduced by more than 33.33%and 17.91,respectively.The length of full pipe was reduced by more than 64.93%and 80.93%respectively.In the LID "green" scheme,the two schemes reduce the water area by more than 66.63%and the water depth by more than 96.67%.All the drainage and waterlogging schemes can solve the problem of waterlogging in the study area,which has good practical significance and reference significance to solve the problem of waterlogging in cities.