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Feldens, P., Sakuna, D., Somgpongchaiykul, P., Schwarzer, K.. Shallow water sediment structures in a tsunami-affected area (Parkarang Cape, Thailand). In: Schwarzer, K., Schrottke, K., Stattegger, K. (eds.). From Brazil to Thailand - New Results in Coastal Research. Coastline Reports (16), pp. 15-24. EUCC - Die Küsten Union Deutschland e.V., Rostock, 2010.

Zusammenfassung: The influence of tsunami on the seafloor is poorly understood. Detailed hydroacoustic surveys and sediment sampling campaigns were carried out in 2007 and 2008 offshore Pakarang Cape (Thailand) to catalogue the geomarine effects of the 2004 Indian Ocean tsunami. A major problem in determining tsunami influence in offshore deposits is the lack of pre-tsunami mappings. Starting in 15 m water depth, a system of sand ridges composed of coarse sand exists offshore Pakarang Cape. Elongated sediment transport structures on the NW-flanks of the sand ridges, slowly fading during the annual cycle, indicate the presence of a current oblique to the coastline. This current might coincide with the 2004 Indian Ocean Tsunami. A several cm-thick event layer found at the base of a sand ridge is composed of silty sediment, which could be related to the tsunami backwash or strong floods during the monsoon. These event deposits are covered by coarse sand. They might enter the geological record.
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