A dike–groyne algorithm in a terrain-following coordinate ocean model (FVCOM) : development, validation and application

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Date
2012-01
Authors
Ge, Jianzhong
Chen, Changsheng
Qi, Jianhua
Ding, Pingxing
Beardsley, Robert C.
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Dike-Groyne
Changjiang estuary
Finite volume method
Unstructured grid
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.
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Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Ocean Modelling 47 (2012): 26-40, doi:10.1016/j.ocemod.2012.01.006.
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