Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability
1
Department of Civil Engineering, Muroran Institute of Technology, Mizumoto 27-1, Muroran 050-8585, Japan
2
Faculty of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo 060-8628, Japan
3
Graduate School of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo 060-8628, Japan
4
Faculty of Urban Environmental and Infrastructural Engineering, Hanoi Architectural University, Hanoi 100000, Vietnam
*
Author to whom correspondence should be addressed.
Academic Editor: Luis Mediero
Water 2021, 13(7), 896; https://doi.org/10.3390/w13070896
Received: 25 February 2021 / Revised: 18 March 2021 / Accepted: 22 March 2021 / Published: 25 March 2021
(This article belongs to the Special Issue Influence of Climate Change on Floods)
This study aims to evaluate the change in flood inundation in the Chitose River basin (CRB), a tributary of the Ishikari River, considering the extreme rainfall impacts and topographic vulnerability. The changing impacts were assessed using a large-ensemble rainfall dataset with a high resolution of 5 km (d4PDF) as input data for the rainfall–runoff–inundation (RRI) model. Additionally, the prediction of time differences between the peak discharge in the Chitose River and peak water levels at the confluence point intersecting the Ishikari River were improved compared to the previous study. Results indicate that due to climatic changes, extreme river floods are expected to increase by 21–24% in the Ishikari River basin (IRB), while flood inundation is expected to be severe and higher in the CRB, with increases of 24.5, 46.5, and 13.8% for the inundation area, inundation volume, and peak inundation depth, respectively. Flood inundation is likely to occur in the CRB downstream area with a frequency of 90–100%. Additionally, the inundation duration is expected to increase by 5–10 h here. Moreover, the short time difference (0–10 h) is predicted to increase significantly in the CRB. This study provides useful information for policymakers to mitigate flood damage in vulnerable areas.
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Keywords:
river discharge; flood inundation; Ishikari River basin; Chitose River basin; d4PDF; RRI model; climate change; backwater phenomenon; hydrological modelling; hydraulic modelling
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MDPI and ACS Style
Nguyen, T.T.; Nakatsugawa, M.; Yamada, T.J.; Hoshino, T. Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability. Water 2021, 13, 896. https://doi.org/10.3390/w13070896
AMA Style
Nguyen TT, Nakatsugawa M, Yamada TJ, Hoshino T. Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability. Water. 2021; 13(7):896. https://doi.org/10.3390/w13070896
Chicago/Turabian StyleNguyen, Thanh T.; Nakatsugawa, Makoto; Yamada, Tomohito J.; Hoshino, Tsuyoshi. 2021. "Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability" Water 13, no. 7: 896. https://doi.org/10.3390/w13070896
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