Study on numerical simulation of urban inundation effects based on Green-Ampt and constant infiltration models
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Abstract:
In order to analyze the influences of Green-Ampt and constant infiltration models on the numerical simulation results of urban inundation,Fengxi New City s taken as a case study to simulate the inundation processing by a urban stormwater numerical model based on hydrological and hydrodynamic methods.Using the Green-Ampt model to calculate the runoff process,the water accumulation in study area is simulated.It is found that the simulation result shows a good agreement with the measured one,and the inundation point can be accurately simulated.The changes of the total water quantity and inundation areaare calculated by using these two different infiltration model with the return period of 1 a,2 a,5 a,10 a,20 a and 50 a respectively.The results show that when the accumulated water reaches its peak value under the different rainfall return period, the water quantity under Green-Ampt model is reduced by 28.41%、26.49%、26.39%、21.04%、17.28%、and 15.02% respectively compared with the constant infiltration model.The total area of water in Class III and above decreased by 31.5%,28.6%,28.3%,20.7%,16.3%,and 127% respectively.This study reveals that the changing law of the inundation degree in different infiltration models under different rainfall return periods,and is of great significance for the more reasonable implementation of numerical model simulation and urban stormwater management.
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