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Comments on “Oscillatory Bottom Boundary Layers”

Comments on “Oscillatory Bottom Boundary Layers” <h2>Introduction</h2> Bottom boundary layers in shallow waters on the inner continental shelf are invariably under the influence of propagating surface gravity waves. Wave-induced oscillatory currents superimposed on the mean current alter the velocity profile in the water column and increase the roughness felt by the mean current. The apparent roughness z 0 a is given by where z 0 is the roughness scale without wave-induced currents, u b is the magnitude of the wave-induced bottom current, u ∗ c is the mean friction velocity due to the mean current, k s = 30 z 0 is the Nikuradse equivalent roughness, φ ; is the angle between the mean current and wave propagation direction, and A b = u b / ω ;, with ω ; being the wave frequency. Of the parameters that affect function F, the most important are u b / u ∗ c and A b / k s ; parameter φ ; has a somewhat weaker influence. Mellor (2002 , henceforth M02 ) has applied a second-moment closure-based turbulence model ( Mellor and Yamada 1982 ) to oscillatory bottom boundary layers. He simulates a purely oscillatory boundary layer and demonstrates that the resulting numerical http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

Comments on “Oscillatory Bottom Boundary Layers”

Kantha, Lakshmi H.
Journal of Physical Oceanography , Volume 35 (7) – Aug 2, 2004
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References (13)

Publisher
American Meteorological Society
Copyright
Copyright © 2004 American Meteorological Society
ISSN
1520-0485
DOI
10.1175/JPO2745.1
Publisher site
See Article on Publisher Site

Abstract

<h2>Introduction</h2> Bottom boundary layers in shallow waters on the inner continental shelf are invariably under the influence of propagating surface gravity waves. Wave-induced oscillatory currents superimposed on the mean current alter the velocity profile in the water column and increase the roughness felt by the mean current. The apparent roughness z 0 a is given by where z 0 is the roughness scale without wave-induced currents, u b is the magnitude of the wave-induced bottom current, u ∗ c is the mean friction velocity due to the mean current, k s = 30 z 0 is the Nikuradse equivalent roughness, φ ; is the angle between the mean current and wave propagation direction, and A b = u b / ω ;, with ω ; being the wave frequency. Of the parameters that affect function F, the most important are u b / u ∗ c and A b / k s ; parameter φ ; has a somewhat weaker influence. Mellor (2002 , henceforth M02 ) has applied a second-moment closure-based turbulence model ( Mellor and Yamada 1982 ) to oscillatory bottom boundary layers. He simulates a purely oscillatory boundary layer and demonstrates that the resulting numerical

Journal

Journal of Physical Oceanography – American Meteorological Society

Published: Aug 2, 2004

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