TSA - a two scale approximation for wind-generated ocean surface waves

(a) To provide an accurate, efficient, computational model (two-scale approximation, TSA) for the 4-wave interactions, in operational wave forecast models, suitable for global, basin and coastal scale applications, and able to transition seamlessly from deep to shallow water. (b) Fully test TSA with respect to exact codes for the full Boltzmann integral (FBI), for durationlimited, fetch-limited wave growth, turning winds, swell-windsea, interactions, etc. (c) Numerically investigate and clarify the basis for TSA, its limitations, errors, enhancements, improvements, self-similarity properties, and spectral flux properties. (d) Implement TSA in a variety of modern operational wave forecast models, e.g. WAVEWATCH (WW3) and SWAN for extensive tests on important, realistic wave conditions. (e) Derive, adapt and implement new formulations for source terms, Sin and Sds, from recent literature and the NOPP partnership, with TSA, in modern wave models, for tests, including veering or accelerating winds, sea and swell interactions, and real storm cases.