The Performance of a Coupled 1-D Circulation and Bottom Boundary Layer Model with Surface Wave Forcing (original) (raw)

2002

Abstract

Grant and Madsen (1979) showed that the nonlinear interaction between steady near bottom currents and oscillatory surface wave currents can produce enhanced bottom stress relative to what a quadratic drag law formulation would indicate. A numerical study of this process has been conducted by combining a bottom boundary layer model (BBLM) with the Dartmouth one-dimensional (1-D) finite element dynamic model called NUBBLE. This model system is forced to dynamic equilibrium by typical Gulf of Maine storm-related 12-second surface waves and prescribed steady geostrophic currents. The results of a suite of sensitivity tests show that: (1) the combined wave and current influence on bottom stress calculations is very important in water depth less than 80 m; (2) the equivalent drag coefficient (Cd) associated with the combination of wave and current interactions is larger than that due to either forcing process alone; and (3) the quadratic drag law is practical for simulating the bottom str...

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