Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow

Paren Mitra; Kiyonobu Kasama; Yasyuki Nakagawa; Kouki Zen

Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow

Paren Mitra, Kiyonobu Kasama, Yasyuki Nakagawa, Kouki Zen

Geotechnical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

This paper presents and evaluates a new reinforcement technique, based on the use of rubber sheets and Permex blocks to negate the effects of tsunami-induced instabilities (seepage flow and scouring) on a caisson type composite breakwater. In this study, a series of hydraulic model tests (on a 1/100 scale prototype) were performed and the effectiveness of the countermeasures was evaluated based on the displacement of the caisson, mapping the seepage flow pattern within the mound and calculating the stable weight of the mound. Results obtained from this study verified that the proposed countermeasures significantly improved the overall stability of the breakwater.

Original language	English
Title of host publication	Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018
Publisher	International Society of Offshore and Polar Engineers
Pages	675-680
Number of pages	6
ISBN (Print)	9781880653876
Publication status	Published - Jan 1 2018
Event	28th International Ocean and Polar Engineering Conference, ISOPE 2018 - Sapporo, Japan Duration: Jun 10 2018 → Jun 15 2018

Publication series

Name	Proceedings of the International Offshore and Polar Engineering Conference
Volume	2018-June
ISSN (Print)	1098-6189
ISSN (Electronic)	1555-1792

Other

Other	28th International Ocean and Polar Engineering Conference, ISOPE 2018
Country/Territory	Japan
City	Sapporo
Period	6/10/18 → 6/15/18

All Science Journal Classification (ASJC) codes

Energy Engineering and Power Technology
Ocean Engineering
Mechanical Engineering

Cite this

Mitra, P., Kasama, K., Nakagawa, Y., & Zen, K. (2018). Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow. In Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018 (pp. 675-680). (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2018-June). International Society of Offshore and Polar Engineers.

Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow. / Mitra, Paren; Kasama, Kiyonobu; Nakagawa, Yasyuki et al.
Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. International Society of Offshore and Polar Engineers, 2018. p. 675-680 (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2018-June).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Mitra, P, Kasama, K, Nakagawa, Y & Zen, K 2018, Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow. in Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. Proceedings of the International Offshore and Polar Engineering Conference, vol. 2018-June, International Society of Offshore and Polar Engineers, pp. 675-680, 28th International Ocean and Polar Engineering Conference, ISOPE 2018, Sapporo, Japan, 6/10/18.

Mitra P, Kasama K, Nakagawa Y, Zen K. Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow. In Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. International Society of Offshore and Polar Engineers. 2018. p. 675-680. (Proceedings of the International Offshore and Polar Engineering Conference).

Mitra, Paren ; Kasama, Kiyonobu ; Nakagawa, Yasyuki et al. / Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow. Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. International Society of Offshore and Polar Engineers, 2018. pp. 675-680 (Proceedings of the International Offshore and Polar Engineering Conference).

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AB - This paper presents and evaluates a new reinforcement technique, based on the use of rubber sheets and Permex blocks to negate the effects of tsunami-induced instabilities (seepage flow and scouring) on a caisson type composite breakwater. In this study, a series of hydraulic model tests (on a 1/100 scale prototype) were performed and the effectiveness of the countermeasures was evaluated based on the displacement of the caisson, mapping the seepage flow pattern within the mound and calculating the stable weight of the mound. Results obtained from this study verified that the proposed countermeasures significantly improved the overall stability of the breakwater.

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Model testing of countermeasures for caisson type breakwater under tsunami-induced seepage flow and overflow

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