CMS-Wave Model: Part 5. Full-plane Wave Transformation and Grid Nesting

This Coastal and Hydraulics Engineering Technical Note CHETN describes the full-plane FP wave transformation and grid nesting capability in the Coastal Modeling System s wave model CMS-Wave. The FP wave transformation of CMS-Wave is a new feature that has been added to the existing half-plane HP version Lin et al. 2008, 2011. Grid nesting in the FP is an extension of the grid nesting method that existed in the HP version Lin et al. 2010. The theoretical background and user s manual for CMS-Wave are available in previous reports and CHETNs Lin et al. 2006 Demirbilek et al. 2007. CMS-Wave is part of the Coastal Modeling System CMS developed under the Coastal Inlets Research Program CIRP for simulating combined waves, currents, sediment transport, and morphology change at coastal inlets, estuaries, and river mouths Demirbilek and Rosati 2011. As affected by underlying bathymetric features, currents, and fluctuating water levels, wave characteristics nearshore are usually varying on the scale of tens of meters whereas offshore waves are generally more homogenous at the scale of kilometers. The CMSWave model was developed to simulate nearshore wave propagation of two-dimensional spectral waves to inlets and navigation channels that are often protected by jetties and breakwaters. CMSWave is a finite-difference, phase-averaged spectral wave model based on the wave action balance equation Mase 2001. It employs a forward-marching, finite-difference method to solve the wave action conservation equation for wave transformation including wave shoaling, refraction, diffraction, reflection, transmission over structures, depth-limited breaking, dissipation, wind-wave generation, and wave-wave and wave-current-structure interactions Lin et al. 2008, 2011. A number of wave breaking formulas included in CMS-Wave have been evaluated in laboratory and field applications Zheng et al. 2008.