Abstract
Floods are the one of the most significant natural disasters, with a damaging effect on human life and properties. Recent global warming and climate change exacerbate the flooding by increasing the frequency and intensity of severe floods. This study explores the role of groundwater during the floods at the Miho catchment in South Korea. The Hydrological-Ecological Integrated watershed-scale Flow model (HEIFLOW) model is used for the flood simulations to investigate the impact of groundwater and streamflow interactions during floods. The HEIFLOW model is assessed by the Nash–Sutcliffe model efficiency coefficient (NSE) and Root Mean Square Error (RMSE) for the surface water and groundwater domains, respectively. The model evaluation shows the acceptable model performance (0.64 NSE and 0.25 m–2.06 m RMSE) with the hourly time steps. The HEIFLOW shows potential as one of the methods for the flood risk management in South Korea. The major findings of this study indicate that the stream runoff at the Miho catchment is highly affected by the groundwater flows during the dry and flood seasons. Thus, the interactions between surface water and groundwater domains should be fully considered to mitigate the water hazards at the catchment scale.
Highlights
Flood is one of the most significant natural disasters in the world that cause aboutUSD 40 billion losses in human life and properties every year [1]
The major findings of this study indicate that the stream runoff at the Miho catchment is highly affected by the groundwater flows during the dry and flood seasons
Recent global warming and climate change amplify the flooding by increasing frequency and intensity of severe floods in the near future [2]
Summary
Flood is one of the most significant natural disasters in the world that cause about. The traditional method of flood risk mitigation aims to at reduce the flood risks by land surface hydraulic structures such as dams, river embankments, and reservoirs [3]. Those hydraulic structures only focus on the surface water domain in the wet season without considering the impacts of groundwater and groundwater flooding. The conceptual hydrological model is generally used in data scarce catchments, and it does not properly consider groundwater flow. The Hydrological-Ecological Integrated watershed-scale Flow model (HEIFLOW) model is used for the hourly flood simulations to investigate the impact of groundwater discharge on the peak stream runoff at the flood events
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