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Impact of 2004 tsunami on seafloor morphology and offshore sediments, Pakarang Cape, Thailand

100%

Feldens P., Schwarzer K., Szczucinski W., Stattegger K., Sakuna D., Somgpongchaiykul P.

Polish Journal of Environmental Studies

2009

tom 18

nr 1

63-68

This study documents seafloor morphology and sediments based on multibeam, side-scan sonar and boomer surveys, as well as sediment samples taken on the inner to mid shelf of the Andaman Sea after the 2004 Indian Ocean tsunami. Preservation of submarine relief in former underwater mining areas points to limited impact of the tsunami, while channel structures parallel to the observed tsunami backwash indicate a possible higher impact. Therefore, the tsunami impact seems to be focused on some areas. The impact was probably most effective during the backwash, when stiff mud deposits containing grass, wood fragments and shells were transported by high density backwash flows. Moreover, several boulders, which might have been deposited during the tsunami backwash flow, were found in the channels in front of Pakarang Cape.

Importance of the initial waveform and coastal profile for tsunami transport of boulders

84%

Goto K., Okada K., Imamura F.

Polish Journal of Environmental Studies

2009

tom 18

nr 1

53-61

The 2004 Indian Ocean tsunami transported large boulders shoreward at Pakarang Cape, Thailand. To elucidate boulder transport processes using their original locations, initial tsunami waveform, and coastal profiles, we conducted a cross-sectional calculation. Our results indicate that the tsunami (trough arrives first) might have displaced boulders and cast some on the tidal bench. However, if the wave crest arrives first, only some reef-edge boulders are displaced and emplaced on the tidal bench. More and larger boulders are displaced and deposited on the tidal bench when the reef slope is gentle, as at Pakarang Cape, than for a steep slope case.

Damage to mangrove forest by 2004 tsunami at Pakarang Cape and Namkem, Thailand

84%

Yanagisawa H., Koshimura S., Goto K., Miyagi T., Imamura F., Ruangrassamee A., Tanavud C.

Polish Journal of Environmental Studies

2009

tom 18

nr 1

35-42

We investigated damage to mangroves from the 2004 Indian Ocean tsunami at Pakarang Cape and Namkem, Thailand. Visual inspection of remotely sensed images revealed that 12 and 20 ha of mangrove forests were damaged, respectively, at Pakarang Cape and Namkem. Field surveys revealed that mangrove trees were destroyed particularly around the river mouths and channels. Numerical simulation indicated that the flow concentrated at the river mouth and inundated mangrove forests through river channels. We concluded that the tsunami flow pattern was largely affected by local river mouth and channel topography. Damage to mangroves might be severe in such areas.

Ograniczanie wyników

3 Polish Journal of Environmental Studies

2 Goto K.

2 Imamura F.

1 Feldens P.

1 Koshimura S.

1 Miyagi T.

1 Okada K.

1 Ruangrassamee A.

1 Sakuna D.

1 Schwarzer K.

1 Somgpongchaiykul P.

1 Stattegger K.

1 Szczucinski W.

1 Tanavud C.

1 Yanagisawa H.

3 2009

Wyniki wyszukiwania

Impact of 2004 tsunami on seafloor morphology and offshore sediments, Pakarang Cape, Thailand

Importance of the initial waveform and coastal profile for tsunami transport of boulders

Damage to mangrove forest by 2004 tsunami at Pakarang Cape and Namkem, Thailand