Flood propagation simulation considering soil infiltration based on a
fully hydrodynamic numerical model
Abstract
Traditional flood simulations fail to properly consider the impact of
soil infiltration in floodplain areas with high soil infiltration rates.
Notably, ignoring soil infiltration will lead to considerable
uncertainty in flood simulations. In this paper, a fully hydrodynamic
model coupled with the Green-Ampt infiltration model is used. Taking a
natural reach in northern China (HTH in this paper) as a case study,
observed flood discharge data are used to analyze the influence of soil
infiltration on flood propagation based on the flood propagation
simulation results for various inflow conditions. The results show that
soil infiltration has little effect on the inundation area during the
rising stage of a flood. In the late period a flood, the inundation area
considering the effect of infiltration is smaller than that without
infiltration, and the smaller the peak coefficient is, the longer the
flood duration is, the larger the impact of infiltration on the
inundation area. The research results provide a reference for flood
management and post-disaster rescue efforts.