Numerical Study of Geomorphologic Evolution Induced by Typhoon in Embayed Beach
The geomorphologic evolution induced by typhoon in embayed beach is complicated;it is of great theoretical and practical significance to clarify the response process and mechanism.In this paper,we constructed a numerical model of geomorphologic evolution under the typhoon in embayed beach based on XBeach software,and simulated the response process of Dongsha beach geomorphology to Super Typhoon Lekima.Then we analyzed the mechanism of sediment transport and geomorphologic evolution.The study shows that the tidal level and the strength of the typhoon waves play a dominant role in the geomorphologic evolution in embayed beach,and that under the combined effect of these two factors,the upper part of the beach(foreshore)erodes significantly,and the overall movement of the sediment moves offshore,and siltation occurs in the lower part of the beach(backshore).The rip currents cause a greater degree of beach erosion under typhoon wave and storm surge conditions,and the currents during low tide also play an important role in sediment transport along the shoreline.The weakening of wave kinetic energy in the sheltered area of the headland is the main reason for the occurrence of sedimentation.
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维普
