SIMULATIONS OF CORAL GRAVEL ACCUMULATION IN THE OPEN-CUT CAUSEWAY IN FONGAFALE ISLET OF FUNAFUTI ATOLL, TUVALU
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Keywords

coral gravel transportation
numerical simulation
Funafuti atoll

How to Cite

Sato, D., & Yokoki, H. (2014). SIMULATIONS OF CORAL GRAVEL ACCUMULATION IN THE OPEN-CUT CAUSEWAY IN FONGAFALE ISLET OF FUNAFUTI ATOLL, TUVALU. Coastal Engineering Proceedings, 1(34), sediment.38. https://doi.org/10.9753/icce.v34.sediment.38

Abstract

Numerical simulations of coral gravel transportation were conducted to estimate the accumulation possibility in the gap which is formed by the open-cutting of the causeway in Fongafale Islet of Funafuti Atoll. In the numerical simulation of wave field, the high wave conditions were considered in the boundary condition. Calculated morphological change in the gap showed that the extremely large accumulation of coral gravels was not estimated. However the southern edge of the gap had large accumulation locally. In the middle and northern part of the gap accumulated gravel formed thin layer. Because the calculated morphological change of lower wave condition showed large accumulation as well as the results of higher wave condition, it is estimated that the direction of incident wave is important factor of the accumulation. The simulated result indicated that the rapid blockade of the gap would not be caused by accumulation of coral gravels. However, the periodic maintenance of the gap is required for keeping the function of the gap continuously.
https://doi.org/10.9753/icce.v34.sediment.38
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References

Booij, N.R., C. Ris and L.H. Holthuijsen. 1999. A third-generation wave model for coastal regions 1. Model description and validation. Journal of Geophysical Research,104,C4,7649-7666.

Hasselmann, K., T.P. Barnett, E. Bouws, H. Carlson, D.E. Cartwright, K. Enke, J.A. Ewing, H. Gienapp, D.E. Hasselmann, P. Kruseman, A. Meerburg, P. Muller, D.J. Olbers, K. Richter, W. Sell and H. Walden. 1973. Measurement of wind-wave growth and swell decay during the Joint North Sea Wave Project(JONSWAP), Dtsch. Hydrogr. Z. Suppl., 12, A8.

Kench, P.S., and R.W. Brander. 2006. Wave processes on coral reef flats: Implications for reef geomorphology using Australian case studies, Journal of Coastal Research, 22, 1, 209-223.

Leatherman, S.P. 1977. Sea-level rise and small island states: An overview, Journal of Coastal Research, Special Issue 24, 1-16.

Sato, S. and M. B. Kabiling. 1994. A Numerical Simulation of Beach Evolution based on a Nonlinear Dispersive Wave-Current Model, Proc. of the Inter. Conf. on Coastal Eng., No 24, 2557-2570.

Sato, D. and H. Yokoki. 2010. Numerical calculation on shoreline conservation in Majuro Atoll, Marshall Islands, Proceedings of 32nd International Conference on Coastal Engineering, pp.1-14.

Sato, D., H. Yokoki and H. Kayanne. 2012. Improvement of sediment transport by excavation of causeway in Funafuti Atoll, Tuvalu, Poster presentation of the Inter. Conf. on Coastal Eng. 2012, Santander.

Sawaragi, T. and I. Deguchi. 1996. 新編海岸工学,å...±ç«‹å‡ºç‰ˆæ ªå¼ä¼šç¤¾ï¼Œpp.122.(In Japanese)

Yamano, H., H. Kayanne, and M. Chikamori. 2005. An Overview of The Nature and Dynamics of Reef Islands, Global Environmental Research, 9(1), 9-20.

Yokoki, H., H. Kayanne, D. Sato, Y. Minami, S. Ando, H. Shimazaki, T. Yamaguchi, M. Chikamori, A. Ishoda, and H. Takagi. 2005. Comparison between Longshore Sediment Transport Due to Waves and Long-term Shoreline Change in Majuro Atoll, Marshall Islands, Global Environmental Research, 9(1), 21-26.

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