MECHANISM OF OFFSHORE SAND DISCHARGE INTO SUBMARINE CANYON TRIGGERED BY CONSTRUCTING DETACHED BREAKWATER CLOSE TO SHORELINE

Koji Yamada; Takaaki Uda; Yoshio Suwa; Toshiro San-nami; Kou Furuike; Toshinori Ishikawa

doi:10.9753/icce.v32.sediment.18

No. 32 (2010), Sediment Transport and Morphology

No. 32 (2010)

MECHANISM OF OFFSHORE SAND DISCHARGE INTO SUBMARINE CANYON TRIGGERED BY CONSTRUCTING DETACHED BREAKWATER CLOSE TO SHORELINE

Sediment Transport and Morphology

https://doi.org/10.9753/icce.v32.sediment.18

Published 2011-01-29

Koji Yamada⁺⁻
Takaaki Uda⁺⁻
Yoshio Suwa⁺⁻
Toshiro San-nami⁺⁻
Kou Furuike⁺⁻
Toshinori Ishikawa⁺⁻

Koji Yamada

National Institute for Land and Infrastructure Management

Takaaki Uda

Public Works Research Center

Yoshio Suwa

National Institute for Land and Infrastructure Management

Toshiro San-nami

Coastal Engineering Laboratory Co., Ltd.

Kou Furuike

Coastal Engineering Laboratory Co., Ltd.

Toshinori Ishikawa

Public Works Research Center

Proceedings of the 32nd International Conference

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Keywords

submarine canyon
offshore sand transport
detached breakwater
Shimoni-ikawa coast

How to Cite

Yamada, K., Uda, T., Suwa, Y., San-nami, T., Furuike, K., & Ishikawa, T. (2011). MECHANISM OF OFFSHORE SAND DISCHARGE INTO SUBMARINE CANYON TRIGGERED BY CONSTRUCTING DETACHED BREAKWATER CLOSE TO SHORELINE. Coastal Engineering Proceedings, 1(32), sediment.18. https://doi.org/10.9753/icce.v32.sediment.18

Abstract

Several submarine canyons have developed offshore of the Aramata region of the Shimoni-ikawa coast in Toyama Bay, which is one of the three deep bays in Japan. The Kurobe River with a steep bed slope flows into the sea immediately north of this region, and a large amount of sediment has been supplied to this area, which has been transported by southward longshore sand transport. However, beach erosion has occurred owing to the decrease in sediment supply from the Kurobe River. Furthermore, since the construction of detached breakwaters as a measure against beach erosion, offshore sand transport has accelerated and beach erosion has become more severe. In this study, aerial photographs and bathymetric survey data were analyzed, then the mechanism of offshore sand transport was investigated using the BG model proposed by Serizawa et al. (2007).

https://doi.org/10.9753/icce.v32.sediment.18

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References

Kanazawa, Y., N. Sasakura, S. Nakayama, M. Fukuhama, K. Yamamoto, S. Hashimoto and S. Henmi. 2006. Large-scale landslides offshore of Kurobe River mouth, Annual Jour. Coastal Eng., Vol. 3, 611-615. (in Japanese)

Ozasa, H. and A. H. Brampton. 1980. Model for predicting the shoreline evolution of beaches backed by seawalls, Coastal Eng., Vol. 4, 47-64. http://dx.doi.org/10.1016/0378-3839(80)90005-8

Sakai, K., T. Uda, M. Serizawa, T. Kumada and Y. Kanda. 2006. Model for predicting three-dimensional sea bottom topography of statically stable beach, Proc. 30th ICCE, 3184-3196.

Serizawa, M., T. Uda, T. San-nami, K. Furuike, T. Ishikawa and T. Kumada. 2007. Model for predicting beach changes on coast with sand of mixed grain size based on Bagnold's concept, Coastal Sediments '07, 314-326. http://dx.doi.org/10.1061/40926(239)24

Uda, T., N. Nakata and A. Omata. 1989. Sand discharge into deep sea offshore of Shimoni-ikawa coast, Annual Jour. Coastal Eng., Vol. 36, 374-378. (in Japanese) http://dx.doi.org/10.2208/proce1989.36.374

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MECHANISM OF OFFSHORE SAND DISCHARGE INTO SUBMARINE CANYON TRIGGERED BY CONSTRUCTING DETACHED BREAKWATER CLOSE TO SHORELINE

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