Keywords
topographic changes
interaction
wave-sheltering effect
BG model
How to Cite
Abstract
On a flat shallow seabed, sand spits and cuspate forelands with rhythmic shapes may develop and a barrier island can elongate alongshore, which significantly differs from the beach changes on coasts facing a deep ocean. In this study, the interaction between two circular sandy islands on a flat shallow seabed owing to waves was investigated by numerical simulation, focusing on the wave-sheltering effect of the islands themselves. The topographic changes caused by the interaction between two sandy islands were predicted using the BG model (a three-dimensional model for predicting beach changes based on Bagnold's concept).References
Davis, R. A, JR and Fitzgerald, D. M. 2004. Beaches and Coasts, Blackwell Publishing, Malden, 419 p. Horikawa, K. ed. 1988. Nearshore Dynamics and Coastal Processes, University of Tokyo Press, Tokyo, 522p.
Kikuchi, A., Uda, T., Nishi, T., San-nami, T., Furuike, K. and Serizawa, M. 2002. Rapid beach changes on reef coast caused by sea level rise -the example of Maebama Beach in Miyako Island-, Ann. J. Coastal Eng. JSCE, 49, pp. 596-600. (in Japanese)
Miyahara, S, Uda, T. and Serizawa, M. 2013. Prediction of topographic changes of a circular sandy island using BG model, Asian and Pacific Coasts 2013, Proc. 7th International Conf., pp. 17-23.
San-nami, T., Uda, T., Serizawa, M. and Miyahara, S. 2013. Prediction of devastation of natural coral cay by human activity, Proc. Coastal Dynamics 2013, Paper No. 138, pp. 1427-1438.
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.
Serizawa, M. and Uda, T. 2011. Prediction of formation of sand spit on coast with sudden change using improved BG model, Coastal Sediments '11, pp. 1907-1919.
Serizawa, M., Uda, T. and Miyahara, S. 2012. Prediction of development of sand spits and cuspate forelands of rhythmic shapes caused by shoreline instability using BG model, Proc. 33rd ICCE, sediment.35, 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. 24-32.
Uda, T., Serizawa, M. and Miyahara, S. 2014. Development of sand spits and cuspate forelands with rhythmic shapes and their deformation by effects of construction of coastal structures (Chap. 19), pp. 419-450, in 'Computational and Numerical Simulations' Awrejcewicz, L. ed., INTEC. http://www.intechopen.com/books/computational-and-numerical-simulations/development-of- sand-spits-and-cuspate-forelands-with-rhythmic-shapes-and-their-deformation-by-effect#article- front