Investigation and Discussion on the Beach Morphodynamic Response Under Storm Events Based on A Three-Dimensional Numerical Model  

作　　者：XIE Ming-xiao LI Shan ZHANG Chi YANG Zhi-wen HOU Zhi-qiang ZHANG Huaqing 

机构地区：[1]Key Laboratory of Engineering Sediment,Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300456,China [2]CCCC First Harbor Engineering Co.Ltd.,Tianjin 300461,China [3]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China

出　　处：《China Ocean Engineering》2021年第1期12-25,共14页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51779112 and 51879096);Research Innovation Fund of Tianjin Research Institute for Water Transport Engineering(Grant Nos.TKS20200401 and TKS180405).

摘　　要：A well-established 3D phase-averaged beach morphodynamic model was applied to investigate the morphodynamics of a typical artificial beach,and a series of discussions were made on the surfzone hydro-sedimentological processes under calm and storm events.Model results revealed that the nearshore wave-induced current presents a significant 3D structure under stormy waves,where the undertow and longshore currents exist simultaneously,forming a spirallike circulation system in the surfzone.Continuous longshore sediment transport would shorten the sediment supply in the cross-shore direction,subsequently suppress the formation of sandbars,showing that a typical recovery profile under calm waves does not necessarily develop,but with a competing process of onshore drift,undertow and longshore currents.Sediment transport rate during storms reaches several hundreds of times as those under calm waves,and two storm events contribute approximately 60%to the beach erosion.Sediment transport pattern under calm waves is mainly bed load,but as the fine sands underneath begin to expose,the contribution of suspended load becomes significant.

关 键 词：beach evolution phase-averaged model wave-induced current storm surge MORPHODYNAMICS 

分 类 号：P731.23[天文地球—海洋科学]