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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/nhess-2019-263
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-263
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Aug 2019

Submitted as: research article | 26 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

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

Ryota Masaya1, Anawat Suppasri2, Kei Yamashita2, Fumihiko Imamura2, Chris Gouramanis3, and Natt Leelawat4,5 Ryota Masaya et al.
  • 1Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-06, Aoba-ku, Sendai 980-0845, Japan
  • 2International Research Institute of Disaster Science, Tohoku University, 468-1 Aoba, Aramaki-Aza, Aoba-ku, Sendai 980-0845, Japan
  • 3Department of Geography, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
  • 4Department of Industrial Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
  • 5Disaster and Risk Management Information Systems Research Group, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand

Abstract. The 2004 Indian Ocean Tsunami and the 2011 Great East Japan earthquake and tsunami caused large-scale topographic changes in coastal areas. Whereas much research has focused on coastlines that have or had large human populations, little focus has been paid on coastlines that have little or no infrastructure. The importance of examining erosional and depositional mechanisms of tsunami events lies in the rapid reorganisation that coastlines must undertake immediately after an event. Through understanding the precursor conditions to this reorganisation is paramount to the reconstruction of the coastal environment. This study examines the locations of sediment erosion and deposition during the 2004 Indian Ocean Tsunami event on the relatively pristine Phra Thong Island, Thailand. Coupled with satellite imagery, we use numerical simulations and sediment transportation models to determine the locations of significant erosion and the areas where much of that sediment was redeposited during the tsunami inundation and backwash processes. Our modelling approach confirms that beaches on Phra Thong Island were significantly eroded by the 2004 tsunami, predominantly during the backwash phase of the first and largest wave to strike the island. Although 2004 tsunami sediment 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 when normal coastal processes resume.

Ryota Masaya et al.
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Data sets

Medieval forewarning of the 2004 Indian Ocean tsunami in Thailand K. Jankaew, B. F. Atwater, Y. Sawai, M. Choowong, T. Charoentitirat, M. E. Martin, and A. Prendergast https://doi.org/10.1038/nature07373

Ryota Masaya et al.
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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.
This study examines the sediment transport during the 2004 Indian Ocean Tsunami event on Phra...
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