Tsunami Solitary Wave Propagating Over Conical İsland, youtube mp3 indir

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Tsunami (Solitary Wave) Propagating Over Conical Island

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A solitary wave (a proxy for a tsuami) is generated and allowed to propagate around a conical island. This is to simulate tsunami runup in the lee of an offshore island. Test performed in the Directional Wave Basin at the O.H. Hinsdale Lab, Oregon State University.

One of the purposes of this experiment is to see whether the local belief that offshore islands reduce the inundation of the tsunami on the beach right behind the island was correct or not. That belief can affect the effectiveness of early warning systems. If you watch as the beach gets inundated when the tsunami hits it, the runup of the water is noticeably higher in one spot than elsewhere. That spot is directly behind the island.

The remainder of our experiments show that, at best, the inundation behind the island is no different than it would be on other parts of the beach where there is no island. It is never lower, and in some cases as high as twice the excursion of the runup with no island involved. This fits with field observations taken in Indonesia after a tsunami caused by the Mentawai earthquake in 2010.

This experiment was part of work supported by NSF-CMMI Grant 1208147.