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DOI	10.1007/s11069-021-04635-7
	Effects of geomorphological and geohydrological features on flood hazard in a coastal basin
	Ouyang M.; Ito Y.; Tokunaga T.
发表日期	2021
ISSN	0921030X
起始页码	1371
结束页码	1385
卷号	107 期号:2
英文摘要	Anomalous precipitation (more than 360 mm/d) caused severe flood inundation in the Kujukuri plain, Japan, on October 25, 2019. In this contribution, we employed a hydrological and hydraulic model to reproduce this flood and to examine the possible factors affecting the disaster. The simulated results showed consistent areal extents of inundation compared with the field investigation, suggesting potential application of numerical approaches for assessing the flood hazard. Details of the simulation results obtained from the flood on October 25, 2019, together with those on October 8, 2004 and October 15, 2013, revealed that the local geomorphological and geohydrological features significantly influenced the flood hazard. The low elevation lands located near the confluence zones of the rivers and enclosed by higher elevation terraces were found to be quite vulnerable to floods. Numerical simulation suggested that the study area showed both direct groundwater recharge from the inundated surface and indirect recharge from the stream leakage. Groundwater stored during the flood fed the river after the peaks of the precipitation, causing the delay of river water recession process in the stations situated inside the inundated areas. Our results showed that considering local geomorphological and geohydrological characteristics are crucial in evaluating flood hazard. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.
关键词	Flood hazard Geomorphology Groundwater Numerical modeling
英文关键词	coastal zone; flood; geomorphology; groundwater; hydrological modeling; numerical model; recharge; river water; Chiba; Honshu; Japan; Kanto; Kujukuri
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206476
作者单位	Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, 277-8563, Japan
推荐引用方式 GB/T 7714	Ouyang M.,Ito Y.,Tokunaga T.. Effects of geomorphological and geohydrological features on flood hazard in a coastal basin[J],2021,107(2).
APA	Ouyang M.,Ito Y.,&Tokunaga T..(2021).Effects of geomorphological and geohydrological features on flood hazard in a coastal basin.Natural Hazards,107(2).
MLA	Ouyang M.,et al."Effects of geomorphological and geohydrological features on flood hazard in a coastal basin".Natural Hazards 107.2(2021).