Abstract
A new multi-nesting approach for coastal current simulation is presented to effectively incorporate offshore influences and easily remove the difficulties in the treatment of open boundary conditions. In the present method, the computational results in a larger-scale domain are taken into account as the values to be assimilated in a smaller-scale computation. To examine the fundamental validity of the present method, we perform the computation for the propagation of a scattering wave, showing that the numerical accuracy of the present method is appreciably higher than that of a conventional method We also apply the present method to the computation of coastal currents at Shiraho reef in the Ishigaki Island The result indicates that the computational results of the horizontal velocities give good agreements with observed data, demonstrating the fundamental applicability of the present method.
