Wave-adjusted boundary condition for longshore current in finite-volume circulation models |
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| Authors: | Christopher W Reed Adele Militello |
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| Institution: | aURS Corporation, 1625 Summit Lake Drive, Tallahassee, FL 32317, USA;bCoastal Analysis LLC, 4886 Herron Road, Eureka, CA 95503, USA |
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| Abstract: | Numerical modeling of coastal circulation encompassing the nearshore requires forcing by tide, surface gravity waves, and possibly other factors. In the nearshore, the wave-induced longshore current and setup are dominant hydrodynamic processes, and lateral boundary conditions representing tide and oceanic forcing typically do not include surface-wave contributions. Without proper boundary conditions, significant gradients in current and water level can occur that contaminate the solution in the internal domain. A standard strategy is to place the boundaries far from the site of interest, but this strategy greatly increases computational demands, and it may not be appropriate for long-term simulations. This paper describes a wave-adjusted boundary condition that accounts for wave-induced water level and current acting in combination with tidal forcing. The wave-adjusted boundary condition is demonstrated for an idealized case of a parallel-contour beach and for an engineering application at Ocean City, MD. |
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| Keywords: | Nearshore circulation Longshore current Wave setup Boundary condition Numerical modeling |
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