Construction and Application of Generalized Drainage Model in Urban Underpass Road
The underpass road is a high-risk area prone to urban waterlogging.To promptly predict the waterlogging in the underpass road under diverse rainfall conditions,a generalized drainage model for the urban underpass road was established based on the relationship between the drainage capacity of each facility and the system by generalizing the process of runoff confluence,drainage,and accumulation.The waterlogging of a real underpass road under the 2-hour design rainfall of 1-100 years return period was simulated based on the generalized model,and the calculation results of the generalized model were compared with the simulation results of InfoWorks ICM.The Nash-Sutcliffe efficiency coefficient was above 0.7,the deviation of peak waterlogging depth was less than 20％,the deviation of waterlogging duration was less than 20％,the deviation of peak waterlogging depth duration was less than 1 h,and the running time was only 2-3 s.This indicates that the generalized model can achieve rapid prediction and analysis of the waterlogging in the underpass road.
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