Effect of Wave-Enhanced Bottom Friction on Storm-Driven Circulation in Massachusetts Bay
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 123, Issue 5
Abstract
Massachusetts Bay is a shallow (35 m average depth) semienclosed embayment, roughly 100 × 50 km, which opens into the Gulf of Maine at its eastern boundary. Surface waves associated with winter storm winds from the northeast cause large sediment resuspension events, and wave and circulation fields during these events have a quasi-steady response to the wind stress. Coupled wave, circulation, and boundary layer models indicate that wave-enhanced bottom friction has a significant damping effect on storm-driven circulation in Massachusetts Bay. The simulated response exhibits significant three-dimensional structure, but still can be fundamentally understood using idealized models. The depth-integrated momentum balance is dominated by along-bay stress, pressure gradient, and bottom stress. The effective bottom drag coefficient during typical storm conditions is increased by a factor of 2–5 when wave effects are included, but the mean bottom stress is relatively unaffected by wave effects due to a reduction in bottom currents by 30–50. The vertical mixing is also relatively unaffected by the waves, and the result is that the increased drag causes a nearly depth-independent offset of the vertical current profiles. The alongshore transport in the bay is reduced 10–50, depending on wind direction.
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References
1.
Bender, L. C. III, and Wong, K. C. (1993) “The effect of wave-current interaction on tidally forced estuarine circulation.”J. Geophys. Res., 98, 16521–16528.
2.
Blumberg, A., Signell, R., and Jenter, H.(1993). “Modeling transport processes in the coastal ocean.”J. Envir. Engrg., ASCE, 1, 31–52.
3.
Blumberg, A. F., and Mellor, G. L.(1987). “A description of a three-dimensional coastal model.”Coast. and Estuarine Sci., 4, 1–16.
4.
Csanady, G. T.(1973). “Wind-induced barotropic motions in long lakes.”J. Phys. Oceanography, 3, 429–438.
5.
Davies, A. M., and Lawrence, J.(1994). “Examining the influence of wind and wind wave turbulence on tidal currents using a three-dimensional hydrodynamic model including wave-current interaction.”J. Phys. Oceanography, 24, 2441–2460.
6.
Davies, A. M., and Lawrence, J.(1995). “Modeling the effect of wave-current interaction on the three-dimensional wind-driven circulation in the eastern Irish Sea.”J. Phys. Oceanography, 25, 29–45.
7.
Geyer, W., et al. (1992). “Physical oceanographic investigation of Massachusetts and Cape Cod Bays.”Tech. Rep. MBP-92-03, Massachusetts Bays Program, U.S. EPA Region I/Massachusetts Coastal Zone Management Office, Boston, Mass.
8.
Grant, W. D., and Madsen, O. S.(1979). “Combined wave and current interaction with a rough bottom.”J. Geophys. Res., 84, 1797–1808.
9.
Grant, W. D., and Madsen, O. S.(1986). “The continental-shelf boundary layer.”Annu. Rev. Fluid Mech., 18, 265–305.
10.
Hearn, C. J., Hunter, J. R., and Heron, M. L. (1987) “The effects of a deep channel on the wind-induced flushing of a shallow bay or harbor.”J. Geophys. Res. 92, 3913–3924.
11.
Holthuijsen, L. H., Booij, N., and Herbers, T. H. C.(1989). “A prediction model for stationary short-crested waves in shallow water with ambient currents.”Coast. Engrg., 13, 23–54.
12.
Hunter, J. R., and Hearn, C. J.(1987). “Lateral and vertical variations in the wind-driven circulation in long, shallow lakes.”J. Geophys. Res., 92, 13106–13114.
13.
Keen, T. R., and Glenn, S. M.(1994). “A coupled hydrodynamic-bottom boundary layer model of Ekman flow on stratified continental shelves.”J. Phys. Oceanography, 24, 1732–1749.
14.
Knebel, H. J.(1993). “Sedimentary environments within a glaciated estuarine-inner shelf system: Boston Harbor and Massachusetts Bay.”Marine Geol., 110, 7–30.
15.
Signell, R. P. (1994). “Modeling the seasonal circulation in Massachusetts Bay.”Estuarine and coastal modeling. Proc., 3rd Int. Conf., M. L. Spaulding, ed., ASCE, New York, N.Y., 578–590.
16.
Signell, R. P., Jenter, H. L., and Blumberg, A. F. (1996). “Circulation and effluent dilution modeling in Massachusetts Bay: model implementation, verification and results.”Open-file Rep. No. 96-015, U.S. Geological Survey, Reston, Va.
17.
Signell, R. P., Beardsley, R. C., Graber, H. C., and Capotondi, A.(1990). “Effect of wave-current interaction on steady wind-driven circulation in narrow, shallow embayments.”J. Geophys. Res., 95, 9671–9678.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 123 • Issue 5 • September 1997
Pages: 233 - 239
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Sep 1, 1997
Published in print: Sep 1997
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