Distribution of Underwater Tsunami Debris in a Small Bay

概要

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Field study was carried out to investigate the distribution of submerged debris generated by the tsunami on March 11, 2011. We used a digital sonar to measure the distribution and amount of the debris scattered on sea floor of a small bay. The volumes of the debris were estimated from its lateral and base areas which were detected by down and side scans of the sonar, respectively. We identified a total of 147 debris and estimated the total volume of the debris on the sea floor inside the bay. The velocity distribution was computed in the bay in the phase of the tsunami rundown using 3D hydrodynamic model. We found the debris were mostly distributed along the thalweg where the computed velocity showed the maximum value about 3.5m/s.
Japan Society of Civil Engineersの論文