Abstract
Recently, Holloway et al. (1997) compared simulations and measurements of the nonlinear evolution of internal tides on the Australian North West Shelf. The model they used for simulations was based on a Korteweg–de Vries (KdV) type equation, generalized to include dissipative and range varying effects (henceforth referred to as the gKdV equation). The purpose of this present note is to discuss certain issues concerning their inclusion of dissipation, of which there were two types: 1) turbulent horizontal eddy viscosity, represented by the coefficient n (m2 s21), and 2) quadratic bottom friction, represented by the dimensionless coefficient k. The authors pointed out that, for the value of n they used (n 5 2 3 1024 m2 s21), no apparent effect of eddy viscosity was observed. In considering the question as to what effects would have been produced had the value of n been significantly larger, and in investigating this issue further, we made several observations.
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