Evaluation of urban flood control capacity based on hydrodynamic model
The accurate evaluation of the current flood control capacity of urban river channels is the basis for ensu-ring urban flood control safety.There have been many studies on the evaluation of the current flood control capacity of a single river channel,while few studies for river channels in areas with complex flood composition.Jintang is known as the"First City of the Tuojiang River",but it is also the area most severely threatened by floods in the Tuojiang River Basin.This paper constructs a 1D-2D coupled hydrodynamic model for the urban area of Jintang County.The model is calibrated and validated by using typical floods,and it is also applied to evaluate the current flood control capacity for the urban area of Jintang County.The results show that the model has high simulation ac-curacy.The peak errors of three typical floods are all within 1％,and the peak occurrence time errors are all within 1.5 hours at Sanhuangmiao Hydrology Station.The simulated inundation range in the urban area is basically consistent with the actual investigation,and the simulated maximum inundation depth is basically consistent with the measured flood marks.The simulated maximum inundation depth errors at most points are within 0.2 m.The overall flow capac-ity of the urban area is affected by the combination of upstream floods,and floods of the three rivers have significant backwater effects on each other.The flood control standards for existing embankments in the urban area are low,with most of them only meeting the 5-10 year return period,and some weak sections are even less than the 5-year return period.The flood control capacity of many cross-river buildings is less than the 20-year return period,among which Pingan Bridge and Pihe Bridge are less than the 5-year and 10-year return period,respectively.
flood simulation1D-2D couplingcalibration and validationflood control capacityJintang
万方数据
维普
