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JDR Vol.16 No.3 pp. 343-350
(2021)
doi: 10.20965/jdr.2021.p0343

Paper:

Inundation Analysis of the Dike Breach of the Chikuma River Taking Drainage Process and House Damage into Consideration

Makoto Takeda*1,†, Daisuke Sato*2, Kenji Kawaike*3, and Masashi Toyota*4

*1Department of Civil Engineering, Chubu University
1200 Matsumoto-cho, Kasugai, Aichi 487-8501, Japan

Corresponding author

*2Department of Constructional Engineering, Graduate School of Engineering, Chubu University, Aichi, Japan

*3Disaster Prevention Research Institute (DPRI), Kyoto University, Kyoto, Japan

*4Department of Water Environment and Civil Engineering, Faculty of Engimeering, Shinshu University, Nagano, Japan

Received:
September 30, 2020
Accepted:
January 18, 2021
Published:
April 1, 2021
Keywords:
inundation analysis, drainage process, house damage, Chikuma River, dike breach
Abstract

Heavy rain and river flooding due to Typhoon No. 19 in October 2019 led to overflow and a dike breach on the left bank of the Chikuma River that caused large-scale inundation damage in Nagano City, Japan. To devise countermeasures, an inundation analysis model is an important tool. In this study, an inundation analysis model was developed to examine the inundation water behavior. The calculated inundation water depth and inundation area showed good agreement with the observed inundation water depth and the inundated area, confirming the validity of the analysis model. In addition, temporal changes of the inundation state were calculated considering the drainage process. However, the sewerage system, waterway, and drainage pump car were not taken into consideration in this analysis, and future issues for model improvement were also revealed. In addition, an analysis model with a 2 m grid was developed in the dike breach site, and the inundation water flow on roads and the fluid force around houses were obtained after taking into consideration the effect of houses. In paticular, the calculated value of the specific force exerted on damaged houses was very high. Moreover, it was proposed that house hazard should be evaluated while taking into consideration the loss of houses around the dike.

Cite this article as:
M. Takeda, D. Sato, K. Kawaike, and M. Toyota, “Inundation Analysis of the Dike Breach of the Chikuma River Taking Drainage Process and House Damage into Consideration,” J. Disaster Res., Vol.16 No.3, pp. 343-350, 2021.
Data files:
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Last updated on Nov. 04, 2024