Abstract:
A densely grown coastal vegetation belt of Pandanus odoratissimus to reduce 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. 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 more vulnerable to thrashing by tsunami waves than a relatively steep ground
slope. Moreover, densely growing coastal vegetation on the very mild ground slope
dissipated tsunami energy more efficiently than the same vegetation on the relatively
steep ground slope
