REASON OF FIXATION OF MOUTH OF A SMALL RIVER BEHIND NATURAL REEF

  • Yasuhito Noshi
  • Takaaki Uda
  • Akio Kobayashi

Abstract

The mechanism by which the mouth of a small river is stably fixed in the wave-shelter zone behind an offshore reef composed of natural rocks was studied, taking a small river flowing into the Moriya coast together with two other small rivers as examples. The beach topography around the river mouth and the shape of the stream behind the reef were measured on this coast, and the wave height distribution around the reef was calculated using the angular spreading method, and the reason why the river mouth is stably fixed at this location was considered. Furthermore, the numerical simulation of beach changes using the BG model when an offshore breakwater was installed as a model of a natural reef was carried out to study the longshore change in the berm height. The primary cause for the fixation of a river mouth behind a reef was found to be the decrease in wave height behind the reef, which in turn decreases in the berm height.

References

Uda, T., T. Sako, and K. Nomura. 1997. Mechanism of determining the location of river mouth of small rivers flowing into pocket beach and river mouth improvement, Proc. Hydraulics, JSCE, 41, 863- 870. (in Japanese)

Sakai, K., T. Uda, M. Serizawa, T. Kumada, and Y. Kanda. 2006. Model for predicting threedimensional sea bottom topography of statically stable beach, Proceedings of 30th International Conference on Coastal Engineering, ASCE, 3184-3196.

Serizawa, M., T. Uda, T. San-nami, and K. Furuike. 2006. Three-dimensional model for predicting beach changes based on Bagnold's concept, Proceedings of 30th International Conference on Coastal Engineering, ASCE, 3155-3167.

Published
2018-12-30
How to Cite
Noshi, Y., Uda, T., & Kobayashi, A. (2018). REASON OF FIXATION OF MOUTH OF A SMALL RIVER BEHIND NATURAL REEF. Coastal Engineering Proceedings, 1(36), papers.56. https://doi.org/10.9753/icce.v36.papers.56

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