Modelling morphodynamic responses of a natural embayed beach to Typhoon Lekima encountering different tide types

Abstract Recent developments in process-based coastal area models such as XBeach provide new opportunities to predict responses primary forcing mechanisms storm hydrodynamic by using 2DH grids. However, due the lack of measured data, there are few application scenarios models. Therefore, more measurement and research needed. In this paper, Typhoon Lekima that hitting Zhejiang Province during neap tide period was selected simulate morphodynamic Huangcheng Beach assuming encountering with different types. Cross shore measurements eight cross-shore profiles (named S1 ~ S8 from north south) pre- post- respectively were presented. Then a surge wave coupled model established Delft3D Flow/Wave. The well calibrated water levels data provided boundary conditions typhoon types coupling situations for refined model. built simulated morphological beach verifications. On basis numerical results, bed level changes at analyzed, character erosion deposition under illustrated. net sand volume got smaller spring condition rather than middle conditions. Further study distribution induced current stages collision, inundation ebb shown stronger would increase sediment transport rate reduce S3 S6 S8, total amount involved transportation had increased whole beach, leading reduction S1, S2, S4 S5.