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Numerical Simulations of Coastal Overwash Using A phase-averaged Wave−Current−Sediment Transport model

China Ocean Engineering 2022年第2期36卷 191-207页

作者： LI Song-zhe JI Chao ZHANG Qing-he CHEN Tong-qing State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China Key Laboratory of Engineering Sediment Tianjin Research Institute for Water Transport EngineeringMinistry of TransportTianjin 300456China

Coastal overwash is a natural phenomenon that commonly occurs during storm events and can cause considerable changes in nearshore morphology within a short *** this study,a complete set of empirical overwash transport algorithms is developed and introduced into a phase-averaged wave-current-sediment transport coupling model that integrates the Finite-Volume Community Ocean model(FVCOM)and the Simulating Waves Nearshore(SWAN)*** resulting morphological evolution model can simulate coastal *** against the data obtained from multiple sets of laboratory overwash experiments demonstrates that the model performs relatively well in simulating morphological changes caused by runup overwash and inundation overwash under different hydrodynamic and beach profile *** sensitivity of each empirical coefficient in the overwash transport algorithms is comprehensively *** effects of each coefficient on the output of the model are discussed,and a recommended value range is provided for each coefficient.

关键词： wave-current coupling phase-averaged model overwash wave runup morphological evolution

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

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China Ocean Engineering 2021年第1期35卷 12-25页

作者： XIE Ming-xiao LI Shan ZHANG Chi YANG Zhi-wen HOU Zhi-qiang ZHANG Huaqing Key Laboratory of Engineering Sediment Tianjin Research Institute for Water Transport EngineeringM.O.T.Tianjin 300456China CCCC First Harbor Engineering Co.Ltd. Tianjin 300461China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China

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 *** 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 *** 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 *** transport rate during storms reaches several hundreds of times as those under calm waves,and two storm events contribute approximately 60%to the beach *** 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

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