NUMERICAL SIMULATION OF ELONGATION AND MERGING OF BAY MOUTH SAND SPITS USING THE BG MODEL

  • Shusuke Watanabe
  • Takaaki Uda
  • Masumi Serizawa
  • Shiho Miyahara
Keywords: Bay mouth, sand spit, BG model, prediction of beach changes

Abstract

The elongation and merging of bay mouth sand spits due to waves were numerically simulated using the BG model (a three-dimensional model for predicting beach changes based on Bagnold's concept). A bay separated by sandy headlands on both sides was assumed, and the topographic changes were predicted by the model. The wave-sheltering effect of the sand spit located offshore of the other sand spit played an important role in the mergence of the sand spits. The predicted results for the formation of sand spits were in good agreement with those given by Zenkovich (1967).

References

Ashton, A. and Murray, A. B. 2006. High-angle wave instability and emergent shoreline shapes: 1. Modeling of sand waves, flying spits, and capes, J. Geophys. Res., Vol. 111, F04011, doi: 10.1029/2005JF000422.

Serizawa, M., Uda, T., San-nami, T. and Furuike, K. 2006. Three-dimensional model for predicting beach changes based on Bagnold's concept, Proc. 30th ICCE, pp. 3155-3167.

Uda, T. 2010. Japan's Beach Erosion - Reality and Future Measures, World Scientific, London, p. 418. Uda, T. and Serizawa, M. 2011. Model for predicting formation of bay barriers in flat shallow sea, Coastal Sediments '11, pp. 1176-1189.

Uda, T., Serizawa, M. and Miyahara, S. 2012. Numerical simulation of three-dimensional segmentation

of elongated water body using BG model, Proc. 33rd ICCE, pp. 1-11.

Uda, T., Gibo, M., Ishikawa, T., Miyahara, S., San-nami, T. and Serizawa, M. 2013. Change in carbonate beach triggered by construction of a bridge on Irabu Island and its simulation using BG model, Asian and Pacific Coasts 2013, Proc. 7th International Conf., pp. 24-31.

Zenkovich, V. P. 1967. Processes of Coastal Development, Interscience Publishers, New York, p. 751.

Published
2014-10-02
How to Cite
Watanabe, S., Uda, T., Serizawa, M., & Miyahara, S. (2014). NUMERICAL SIMULATION OF ELONGATION AND MERGING OF BAY MOUTH SAND SPITS USING THE BG MODEL. Coastal Engineering Proceedings, 1(34), sediment.4. https://doi.org/10.9753/icce.v34.sediment.4

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