2019 Volume 75 Issue 2 Pages I_683-I_688
A beach change analysis method for three-dimensional (3D) coastal current fields was developed and applied to the calculation of beach deformation around the artificial reef system. We compared this computational output with the observed erosion-deposition maps which was derived from the two depth survey data before and after the event of half year period including winter monsoon winds and a typhoon. During the target period, 10 representative storms are selected and their steady-state solutions of wave field and 3D coastal current field were computed. The storm durations were determined with the concept of equivalent total energy flux. Using these wave and currents fields, the erosion-deposition analysis was conducted and the spatial distributions of the computed coastal deformation for all storms were summed to compare with the observed erosion-deposition map. By this method, it was shown that the erosion-deposition tendency can be reproduced with a certain degree of accuracy even in long-term beach change analysis of the 3D coastal current field in which heavy computational burden is obliged.
