FIELD INVESTIGATION OF TOPOGRAPHIC RESPONSE TO FLOODS AND WAVES AROUND TENRYU RIVER MOUTH

Jun-ichiro Sato; Toshiro San-nami; Takaaki Uda; Toshinori Ishikawa

doi:10.9753/icce.v34.sediment.11

No. 34 (2014), Sediment Transport and Morphology

No. 34 (2014)

FIELD INVESTIGATION OF TOPOGRAPHIC RESPONSE TO FLOODS AND WAVES AROUND TENRYU RIVER MOUTH

Sediment Transport and Morphology

https://doi.org/10.9753/icce.v34.sediment.11

Published 2014-10-02

Jun-ichiro Sato
Toshiro San-nami
Takaaki Uda
Toshinori Ishikawa

Jun-ichiro Sato

Toshiro San-nami

Takaaki Uda

Toshinori Ishikawa

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Keywords

River mouth
Tenryu River
Narrow-multibeam survey
bathymetric changes
river mouth terrace

How to Cite

Sato, J.- ichiro, San-nami, T., Uda, T., & Ishikawa, T. (2014). FIELD INVESTIGATION OF TOPOGRAPHIC RESPONSE TO FLOODS AND WAVES AROUND TENRYU RIVER MOUTH. Coastal Engineering Proceedings, 1(34), sediment.11. https://doi.org/10.9753/icce.v34.sediment.11

Abstract

Bathymetric changes around the mouth of the Tenryu River, one of the largest rivers in Japan and flowing into the Pacific Ocean, were analyzed using the narrow-multibeam survey data taken between 2006 and 2011. The formation/deformation of the river mouth terrace triggered by floods, the formation of bar and trough topography associated with the incidence of storm waves, and the gradual erosion by the imbalance of longshore sand transport were investigated. The sand volume in the study area decreased by 1.66×106 m3 between 2006 and 2011 at a rate of 3.1×105 m3/yr. Because fluvial sand is assumed to have been supplied at a rate of 1.5×105 m3/yr, the rate of decrease in sand volume transported away from the river mouth area by longshore sand transport reached 4.6×105 m3/yr. Urgent measures to mitigate beach erosion are required.

https://doi.org/10.9753/icce.v34.sediment.11

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References

Miyahara, S., Uda, T., Furuike, K., Serizawa, M., San-nami, T. and Ishikawa, T. 2010. Effect of sand bypassing at Sakuma Dam in Tenryu River as a measure against erosion of Tenryu River delta coast, Proc. 32nd ICCE, sediment.106, pp. 1-12.

Miyahara, S., Uda, T., Ishikawa, T., Furuike, K. and Serizawa, M. 2011. Prediction of long-term topographic changes of Tenryu River delta associated with sand bypassing at dam in upper basin assuming no coastal facilities, Asian and Pacific Coasts 2011, Proc. 6th International Conf., pp. 216-223.

Nagashima, I., Iwasaki, N., Uda, T. and Arimura, T. 2005. Beach erosion of area west of Tenryu River mouth on Enshunada coast, Ann. J. Coastal Eng., JSCE, Vol. 52, pp. 596-600. (in Japanese)

Serizawa, M., Uda, T., San-nami, T., Furuike, K. and Ishikawa, T. 2009. Model for predicting recovery of a river mouth bar after flood using BG model, Asian and Pacific Coasts 2009, Proc. 5th International Conf., Vol. 3, pp. 96-102.

Takagawa, T., Saito, S., Ueyama, S., Tajima, Y., Liu, H., Takewaka, S. and Sato, S. 2010. Sediment movements due to storm waves during Typhoon 0918 around the Tenryu River mouth, J. JSCE, Ser. B2 (Coastal Eng.), Vol. 66, pp. 601-605. (in Japanese)

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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FIELD INVESTIGATION OF TOPOGRAPHIC RESPONSE TO FLOODS AND WAVES AROUND TENRYU RIVER MOUTH

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