2HD analysis of morphologic responses to the tsunami impacts using process-based model

Sang Young Son, Tae Hwa Jung

Research output: Contribution to journalConference article

Abstract

Even though tsunami-caused damages mainly refer to ones from inundations and strong currents, recent observations reveal that tsunami waves had significantly affected morphological features in the nearshore area. Since strong and sometimes catastrophic currents are created by tsunami waves, the harbor area is also vulnerable to the morphological changes from tsunami impacts. In this study, the morphological responses to the tsunami waves are examined through numerical simulations using Xbeach model. As a real-scale implementation, 2011 Tohoku-oki tsunami, one of the most destructive tsunamis in history is attempted with a focus on the localized effects of tsunami waves on sedimentation at the Crescent City Harbor. The tsunami physics are known to be less predictable in the nearshore area because of the complex geometric features and the existence of various types of turbulence sources, it is much important to recreate tsunami current field more accurately for the sediment calculations. To this end, a multi-grids and multi-physics tsunami model is preferred for the better reproduction of current fields by tsunami waves in the nearshore. Results on velocity fields computed by tsunami model show that strong and catastrophic currents with large coherent structures were induced by tsunami waves in the harbor area(Son and Lynett, 2015). Such precalculated wave fields during tsunami events are then input to Xbeach model to simulate sedimentation process in the area of interest. Bathymetric changes predicted by Xbeach model reveal that strong velocity fields which had been successfully generated through the tsunami model resulted severe sedimentation processes of scouring and deposition which is consistent with the observation.

Original languageEnglish
Pages (from-to)979-985
Number of pages7
JournalProcedia Engineering
Volume116
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1
Externally publishedYes
Event5th International Conference on Asian and Pacific Coasts, APAC 2009 - Singapore, Singapore
Duration: 2009 Oct 132009 Oct 16

ASJC Scopus subject areas

  • Engineering(all)

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