TSUNAMI CURRENT INUNDATION OF GROUND WITH COASTAL VEGETATION EFFECTS; AN INITIAL STEP TOWARDS A NATURAL SOLUTION FOR TSUNAMI AMELIORATION

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Electronic version of an article published as Journal of Earthquake and Tsunami (JET) Year: 2008 Vol: 2 Issue: 2 (June 2008) Page: 157 - 171 10.1142/S179343110800030X (c) copyright World Scientific Publishing Company http://www.worldscinet.com/jet/A densely grown coastal vegetation belt of Pandanus odoratissimus for reducing the tsunami energy was quantitatively analyzed by an enhanced one-dimensional numerical model that included variations of topography and tsunami characteristics. The drag and inertia forces were assumed as the total resistance generated by the vegetation. It was found that a relatively small period tsunami wave was more destructive than a relatively large period tsunami wave of the same height, although densely grown vegetation effectively reduced the tsunami energy in the case of the small period tsunami wave. A very mild ground slope was also more vulnerable to thrashing by tsunami waves than a relatively steep ground slope. Moreover, densely growing coastal vegetation on very mild ground slope dissipated tsunami energy more efficiently than the same vegetation on relatively steep ground slope.