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This study examines the sediment transport during the 2004 Indian Ocean tsunami event on Phra Thong Island, Thailand. We use numerical simulations and sediment transportation models, and our modelling approach confirms that the beaches were significantly eroded predominantly during the first backwash phase. Although 2004 tsunami deposits are found on the island, we demonstrate that most of the sediment was deposited in the shallow coastal area, facilitating quick recovery of the beach.
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NHESS | Articles | Volume 20, issue 10
Nat. Hazards Earth Syst. Sci., 20, 2823–2841, 2020
https://doi.org/10.5194/nhess-20-2823-2020
Nat. Hazards Earth Syst. Sci., 20, 2823–2841, 2020
https://doi.org/10.5194/nhess-20-2823-2020

Research article 28 Oct 2020

Research article | 28 Oct 2020

Investigating beach erosion related with tsunami sediment transport at Phra Thong Island, Thailand, caused by the 2004 Indian Ocean tsunami

Ryota Masaya et al.

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Aida, I.: Reliability of a tsunami source model derived from fault parameters, J. Phys. Earth, 26, 57–73, 1978. 
Ali, P. Y. and Narayana, A. C.: Short-term morphological and shoreline changes at Trinkat Island, Andaman and Nicobar, India, after the 2004 tsunami, Mar. Geod., 38, 26–39, 2015. 
Arimitsu, T., Kawasaki, K., and Nimura, M.: Numerical simulation of sediment transport and bottom topography change due to tsunami with large scale eddy, Journal of JSCE, B2 (Coastal Engineering), 73, 643–648, 2012. 
Arimitsu, T., Matsuda, S., Murakami, Y., Shikata, T., Kawasaki, K., Mishima, T., Shimizu, R., and Sugawara D.: Influence of computational parameters on accuracy of movable bed model for tsunamis, Coast. Eng., 73, 589–594, 2017. 
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Short summary
This study examines the sediment transport during the 2004 Indian Ocean tsunami event on Phra Thong Island, Thailand. We use numerical simulations and sediment transportation models, and our modelling approach confirms that the beaches were significantly eroded predominantly during the first backwash phase. Although 2004 tsunami deposits are found on the island, we demonstrate that most of the sediment was deposited in the shallow coastal area, facilitating quick recovery of the beach.
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