Abstract
The effect of coastal and river forests on tsunami run-up in a river has been investigated by numerical simulations basedon two-dimensional non-linear long wave equations. A simple coastal and river topography is considered where theriver course is straight and perpendicular to the shore line. The coastal forest zone consists of Rhizophora apiculata woods of 200m wide in the offshore side from the shore line at high tide and Pandanus odoratissimus woods of 100mwide on the backshore. In the river, Rhizophora apiculata woods of 1000m long are placed on the high water channelnear the river mouth. The results of numerical simulations with and without forests suggest the possibility that the coastaland river forests can reduce the run-up not only on the coast but also in the river.
