DISTRIBUTION ANALYSIS OF ENHALUS ACROIDES VEGETATION, USING HYDRAULIC MODEL, IN THE NORTHWEST SEA AREA OF IRIOMOTE ISLAND, OKINAWA, JAPAN

Abstract

 An areawide research result of Enhalusacroides, subtropical seeglass and the endangered species, distributions and growing conditions and the simulated area wide distributions of wave and current, using hydeleulic model of SWAN and CCM for typical winter high wave and spring tide conditions . The suitable condition of the wave and current have been extracted that, D.L. -0.76 min depth, 25-32 cm in H_1/3, 11-19 cm/s in bottom flow, and 0.1-0.3 m/s in residual current. The numerical simulations with these conditions can reproduce the present state of the distribution of E.a. phytocenosis, and reveal that the physical conditions affect strongly the distribution.