Abstract
On the plan of seaside resorts, a lot of trees are cut away from the coastal forests. As tidal waves of which the height is larger than one of trees strike against the coastal forest, the effect of the forest on decreasing damage is studied with flow visualization and image processing. The coastal forests are simulated to groups of circular cylinders with steel wools placed perpendicularly on a ground plane. The circular cylinder and the steel wool present a trunk and branches of a tree, respectively. Branches dam up the tidal waves, and the flows rise to twice the height of trees at the frontal part of the forest. At the downstream of the forest, flows of the empty mid-space with trees differ from that of the full-space with trees. Over-flows fall down on the empty mid-space, and over-flows flow along branches on the full-space. Velocity flow fields of the over-flows are measured by the correlation method.
