Coastal Storm Modeling System: CoSMoS
Above: CoSMoS model framework illustrating interactions among the global, regional, and local models, boundary data used to drive the models, and model outputs used to produce local flood projections. [Larger version]
Although the modeling system was initially developed for use in the high wave-energy environment of the U.S. west coast, CoSMoS is not site-specific and can be utilized on sandy and/or cliff-backed coasts throughout the world. The prototype system developed for the California coast uses the global WAVEWATCH III wave model, the TOPEX/Poseidon satellite altimetry-based global tide model, and atmospheric forcing data from either the U.S. National Weather Service (operational mode) or Global Climate Models (future climate mode) to determine regional wave and water-level boundary conditions, which are dynamically downscaled using a series of nested Delft3D wave (SWAN) and tide (FLOW) models. These data are ultimately linked at the coast to tightly spaced XBeach (eXtreme Beach) cross-shore profile models and a Bayesian probabilistic cliff failure model.