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Technical Report

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U.S. Army Engineer Research and Development Center Coastal Inlets Research Program Vicksburg United States

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CMS-Wave is a two-dimensional spectral wind-wave generation and transformation model that employs a forward-marching, finite-difference method to solve the wave action conservation equation. Capabilities of CMS-Wave include wave shoaling, refraction, diffraction, reflection, transmission over structures, depth-limited breaking, dissipation, wave-wave interaction, wave-current interaction, and wave-structure interactions. Wave diffraction is implemented as a diffraction term derived from the parabolic wave equation to the energy-balance equation. CMS-Wave can be used in either on a half- or full-plane mode, with primary waves propagating from the seaward boundary toward shore. It can calculate wave run-up, wave setup, and rate of flow overtopping structures. Shoreward and seaward reflection is treated using the mirror reflection principle. For model application with large coverage area, multiple grid nesting involving two or more model grids can be used, in which a larger grid with coarse resolution is used to simulate the regional processes while smaller grid with fine resolution is applied to more complex bathymetry and shoreline geometry in the local area. For applications in large domains and long-term simulations, CMS-Wave can run efficiently in a fast mode with multiple processes to expedite the model computations.

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