Study On Simulation Of Waterlogging And Optimization Of Drainage System In A Certain Area Based On Mike Model

In recent years,with the trend of global warming,cities continue to carry out large-scale development,many cities frequent rainstorms and waterlogging disasters,which has brought great security risks and economic losses to urban residents.At present,how to prevent the occurrence of urban rainstorm waterlogging is an urgent problem to be solved in the development of new area,and the evaluation of urban waterlogging by using the model has become a necessary link of urban project construction.Taking Dagang advanced manufacturing base as the research object,using ArcGIS and Mike model tools to build one-dimensional pipeline model,two-dimensional surface model and coupling model,the drainage capacity of Rain Water pipeline is evaluated under various working conditions.For the traditional development and the low impact development,the waterlogging prediction is carried out respectively,and the hydrodynamic situation and the accumulated waterlogging point under the two development modes are compared.The main contents and conclusions are as follows:(1)The constitution and development course of(GIS)and MIKE software of geographic information system are introduced,and the one-dimensional pipe network model(MIKE URBAN CS),two-dimensional surface diffuse flow model(MIKE 21)in MIKE software is expounded respectively.The hydrodynamics calculation principle of coupled model(MIKE FLOOD).This paper introduces the general situation of the research area,introduces the processing methods and generalizations of various basic data,uses ARCGIS software to preprocess the basic data,and establishes the rainfall data under different recurrence periods in order to prepare for the subsequent urban waterlogging simulation.(2)Short-duration rainfall(2h)with different recurrence periods of 1,3,5 and 10 years was selected to simulate the drainage model under traditional development in the study area.The results show that under the traditional development model,the drainage capacity of pipeline is less than 2.8 km once in a year and 6.1 km in 1 ~ 3 years under different rainfall recurrence periods.There are about 4.6 kilometers of pipe networks once in three to five years,7.6 kilometers of pipes in five to 10 years,and about 30 kilometers more than once in 10 years.Most of the pipelines are under heavy rain with a recurrence period of more than 10 years.Can meet the requirements of pipe standards.(3)The urban topography,the river body and the urban pipe network are coupled,and the models under the traditional development of the study area are simulated by the long-term rainfall(24h)with different recurrence periods in 10 years,20 years and 50 years respectively.The results show that there are five main waterlogging points in the case of rainfall in 20 years,namely block 1,block 2,block 3,block 4,block 5,but in the case of sponge city development,the same boundary conditions are found.The depth of waterlogging water was lower than 0.15 m.(4)Optimize the drainage system through low-impact development measures,use SCAD software to evaluate the water quantity,and obtain the integrated runoff coefficient after adding LID measures,and add the generalized LID based on the traditional development model.The nodes and pipelines of the facility are finally simulated by the 50-year long-duration rainfall(24h).The simulation results show that the maximum water depth of the ground in the study area after 20 years of rainfall conditions is optimized.Less than 0.15 meters.