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Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability

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Title: Flood Inundation Assessment in the Low-Lying River Basin Considering Extreme Rainfall Impacts and Topographic Vulnerability
Authors: Thanh Thu Nguyen Browse this author
Nakatsugawa, Makoto Browse this author
Yamada, Tomohito J. Browse this author →KAKEN DB
Hoshino, Tsuyoshi Browse this author →KAKEN DB
Keywords: river discharge
flood inundation
Ishikari River basin
Chitose River basin
RRI model
climate change
backwater phenomenon
hydrological modelling
hydraulic modelling
Issue Date: Apr-2021
Publisher: MDPI
Journal Title: Water
Volume: 13
Issue: 7
Start Page: 896
Publisher DOI: 10.3390/w13070896
Abstract: 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.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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