Journal
PURE AND APPLIED GEOPHYSICS
Volume 172, Issue 12, Pages 3473-3491Publisher
SPRINGER BASEL AG
DOI: 10.1007/s00024-015-1051-8
Keywords
Tsunami; inundation; current velocity; water surface elevation; flow depth; Froude number; tsunami damage; dynamic tsunami input; march 11 2011 Great East Japan Tsunami
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Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) [108Y227]
- European Commission
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The March 2011 Great East Japan Tsunami was one of the most disastrous tsunami events on record, affecting the east coast of Japan to an extreme degree. Extensive currents combined with flow depths in inundation zones account for this devastating impact. Video footage taken by the eyewitnesses reveals the destructive effect and dragging capability of strong tsunami currents along the coast. This study provides a numerical modeling study in Kamaishi Bay, calculating the damage inflicted by tsunami waves on structures and coastlines in terms of the square of the Froude number Fr (2) ; and also other calculated hydrodynamic parameters, such as the distribution of instantaneous flow depths, maximum currents and water surface elevations that occurred during this catastrophic tsunami. Analyses were performed by using the tsunami numerical modeling code NAMI DANCE with nested domains at a higher resolution. The effect of the Kamaishi breakwater on the tsunami inundation distance and coastal damage was tested by using the conditions of with breakwater, without breakwater, and damaged breakwater. Results show that the difference between the hydrostatic pressure on the seaward side of the breakwater and the leeward side of the breakwater is quite high, clarifying conditions contributing to failure of the breakwater. Lower water surface elevations were calculated in the case of a breakwater existing at the entrance, a partly valid condition for the damaged breakwater case. The results are different for current velocities and in the with breakwater condition due to the concentration of energy through the breakwater gaps.
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