ESTIMATION OF THE Enhalus acoroides DISTRIBUTION USING MONTHLY CONDITION OF EXTERNAL FORCES BY WAVE MODEL IN NORTHWEST COAST OF THE IRIOMOTE ISLAND

Abstract

 A sea glass species. Enhalus acroides is an endangered species distributed over Iriomote island. The physical external force were simulated using the wave model (SWAN) . in every month for 1 year. The simulated distributions of monthly averaged H_1/3 and bottom current velocities were compared with the plane distributions of E.a. observed in 2013. The distributions of E.a were reproduced in excessive areas using in calm condition in June. and could be reproduced more correctly using in rough condition in typoon and winter season. E.a. were decreased from 1989 to 2013. in the outer part of H_1/3 and bottom current velocity.