基于MIKE FLOOD的下立交暴雨积水数值模拟研究

gainst the current problem of waterlogging at undetpass when it rains,In this study,the MIKE FLOOD model,which coupled MIKE Urban(a 1D model for a drainage system) and MIKE21 (a 2D hydrodynamic model),was developed to simulated waterlogging and pump operation condition for different design rainfall scenarios,to analyze the causes of the rainstorm waterlogging. The simulation results show that:(1) there was foreign water intruding into the underpass with return periods of 3 yaers, and the amount of foreign water was equivalent to the pumping capacity of 1.07h under the scenario of P=10a ; (2) The outflow (pump drainage) capacity of pump pool was less than inflow abilibity, whitch led to water jacking in pump pool.It can be see that intrusion of foriegn stormwater and insufficient pump drainage capacity is the main reason for the rainstorm waterlogging at JIAN BEI Underpass.This study has revealed the mechanism and process of storm waterlogging at an Underpass,and assessed the ability of the Underpass flood control and drainage capacity, which provided reference for the storm waterlogging treatment and drainage optimization of urban underpass.