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Abstract: Based on the Delft3D-FLOW, a 2D/3D hydrodynamic and sediment transport model was set up for the region of Yangtze Estuary, China. After a series of model verifications, which showed that the model is capable to reproduce the hydrodynamic and sediment transport processes in the region, it is applied to study the storm surge problem and morphological evolution of the Jiuduansha Shoals. It is concluded that the effects of remote wind and waves should be considered to obtain accurate results for storm surges. For reproducing the morphological changes the transport of cohesive as well as the non-cohesive fraction of sediment needs to be taken into account. The model can be considered as a basic tool for managing and studying the Yangtze Estuary. [Copyright &y& Elsevier]

Abstract: A dike–groyne module is developed and implemented into the unstructured-grid, three-dimensional primitive equation finite-volume coastal ocean model (FVCOM) for the study of the hydrodynamics around human-made construction in the coastal area. The unstructured-grid finite-volume flux discrete algorithm makes this module capable of realistically including narrow-width dikes and groynes with free exchange in the upper column and solid blocking in the lower column in a terrain-following coordinate system. This algorithm used in the module is validated for idealized cases with emerged and/or submerged dikes and a coastal seawall where either analytical solutions or laboratory experiments are available for comparison. As an example, this module is applied to the Changjiang Estuary where a dike–groyne structure was constructed in the Deep Waterway channel in the inner shelf of the East China Sea (ECS). Driven by the same forcing under given initial and boundary conditions, a comparison was made for model-predicted flow and salinity via observations between dike–groyne and bed-conforming slope algorithms. The results show that with realistic resolution of water transport above and below the dike–groyne structures, the new method provides more accurate results. FVCOM with this MPI-architecture parallelized dike–groyne module provides a new tool for ocean engineering and inundation applications in coastal regions with dike, seawall and/or dam structures. [Copyright &y& Elsevier]