The Hybrid Parametrical (HYPA) Wave Model

Abstract

The Hybrid Parametrical (hypa) surface wave prediction model for deep water was developed in Sonderforschungsbereich 94 of the University of Hamburg. This model is an extension of the earlier norswam model (Günther et al., 1979a, b; Ewing et al., 1979). It includes, besides parametric prediction of the one-dimensional windsea spectrum, an additional prediction parameter, the mean windsea direction (Günther et al., 1981). The swell propagates on prescribed characteristics for different frequency and direction bins in a way similar to that in the norswam model. In the following sections the three parts of the model (windsea, swell, and windsea—swell exchange) are described.