Abstract
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 was used. Taking a natural reach in northern China (HTH in this paper) as a case study, observed flood discharge data were used to analyze the influence of soil infiltration on flood propagation based on the flood propagation simulation results for various inflow conditions. The maximum difference of inundation area is about 25%. The results show that soil infiltration has little effect on the inundation area during the rising stage of a flood. In the late period of 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. When the peak shape coefficient is 0.42 and the flood duration is 44.4 h, the maximum difference of the inundation area is about 28%. The research results provide a reference for flood management and post-disaster rescue efforts.
Highlights
IntroductionOne of the most well-known definitions of vulnerability to climate change was presented in the Intergovernmental Panel on Climate Change (IPCC) Third Assessment Report (Climate Change 2001: Mitigation, 2002) as the degree to which a system is exposed, sensitive to and/or unable to cope with adverse effects of climate change
Using a fully hydrodynamic model coupled with the Green–Ampt model to simulate the flood propagation
One of the most well-known definitions of vulnerability to climate change was presented in the Intergovernmental Panel on Climate Change (IPCC) Third Assessment Report (Climate Change 2001: Mitigation, 2002) as the degree to which a system is exposed, sensitive to and/or unable to cope with adverse effects of climate change
Summary
One of the most well-known definitions of vulnerability to climate change was presented in the Intergovernmental Panel on Climate Change (IPCC) Third Assessment Report (Climate Change 2001: Mitigation, 2002) as the degree to which a system is exposed, sensitive to and/or unable to cope with adverse effects of climate change. With the frequent occurrence of extraordinary weather worldwide, such as heavy rainstorms and hail, secondary disasters caused by unusual weather, such as debris flows and mountain torrents, are increasing in frequency (Westra et al, 2014; Wu et al, 2014; Valipour et al, 2020). These disaster events can be harmful to human life, and economic losses can be extensive (Marchi et al, 2010; Hou et al, 2020b). To accurately predict the flood risk, we should consider the effects of infiltration
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