TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 56 (No. 3), pp. 261-273, 2000

Tidal Vorticity Around a Coastal Promontory

Moon-Jin Park1* and Dong-Ping Wang2

1Department of Oceanography, Chungnam National University, Taejon, Korea
2Marine Sciences Research Center, State University of New York, Stony Brook, U.S.A.

(Received 28 January 1999; in revised form 28 September 1999; accepted 28 September 1999)

Abstract: The vorticity generation around a coastal promontory is examined using a transport vorticity equation. The complete vorticity balance analysis is made for the transient and residual vorticity generations around an idealized, symmetric promontory. The topographic vorticity tendency is found to be the dominant forcing term in the production of transient tidal vorticities. This result is different from the previous works which emphasized the effects of lateral and bottom frictions. The residual vorticity balance is between advection and topographic vorticity tendency. The model results are consistent with the observations off Gay Head, Massachusetts. Also, the stability of a promontory as well as the offshore sand bank formation are studied by examining the sand transport pattern around the promontory. Strong deposition occurs off the tip of the promontory while erosion occurs along the upstream slope of the promontory suggesting that an originally symmetric promontory tends to incline cyclonically from the axis normal to the tidal stream. Such tendency is indeed found among coastal promontories.

*Corresponding author E-mail: mpark@cnu.ac.kr

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