BREACHING AND TSUNAMI WATER DRAINAGE AT OLD RIVER MOUTH LOCATIONS DURING THE 2011 TSUNAMI

Hitoshi Tanaka; Mohammad Bagus Adityawan; Keiko Udo; Akira Mano

doi:10.9753/icce.v34.currents.5

No. 34 (2014), Swash, Nearshore Currents, and Long Waves

No. 34 (2014)

BREACHING AND TSUNAMI WATER DRAINAGE AT OLD RIVER MOUTH LOCATIONS DURING THE 2011 TSUNAMI

Swash, Nearshore Currents, and Long Waves

https://doi.org/10.9753/icce.v34.currents.5

Published 2014-10-26

Hitoshi Tanaka⁺⁻
Mohammad Bagus Adityawan⁺⁻
Keiko Udo⁺⁻
Akira Mano⁺⁻

Hitoshi Tanaka

Tohoku University

Mohammad Bagus Adityawan

Tohoku University

Keiko Udo

Tohoku University

Akira Mano

Tohoku University

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Keywords

the 2011 tsunami
breaching
topographical features
drainage.

How to Cite

Tanaka, H., Adityawan, M. B., Udo, K., & Mano, A. (2014). BREACHING AND TSUNAMI WATER DRAINAGE AT OLD RIVER MOUTH LOCATIONS DURING THE 2011 TSUNAMI. Coastal Engineering Proceedings, 1(34), currents.5. https://doi.org/10.9753/icce.v34.currents.5

Abstract

This study investigated the effect of the past drainage system and river mouth to the return flow of the 2011 Great East Japan Tsunami at the Arahama Coast and the Akaiko Coast, Sendai, Japan. At both locations, there were old river mouths, which have been closed for many years. They used to be the down stream end of the past drainage system that was confirmed from historical map. Breaching occurred at the location of these old river mouths due to the strong return flow induced by the 2011 tsunami. A detail GIS analysis was carried out based on topographic data (DEM) to obtain the flow direction and accumulation. The results revealed that the topography appears as a river basin with mild slope towards the old river mouth locations. Analysis of the flow accumulation confirms that the topographical features caused the flow to accumulate through the past drainage system towards the location of the old river mouths, which caused the breaching due to the tsunami return flow. This allowed the return flow to be effectively drained.

https://doi.org/10.9753/icce.v34.currents.5

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References

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Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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BREACHING AND TSUNAMI WATER DRAINAGE AT OLD RIVER MOUTH LOCATIONS DURING THE 2011 TSUNAMI

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