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Estuaries

, Volume 22, Issue 2, pp 179–193 | Cite as

Spatial gradients in the flow over an estuarine channel

  • Arnoldo Valle-Levinson
  • Larry P. Atkinson
Article

Abstract

Acoustic Doppler current profiles were measured for a twelve-hour period on February 21, 1997 across Thimble Shoal channel, lower Chesapeake Bay, for the purpose of determining bathymetrically-induced spatial gradients in the flow and their implications for the lateral momentum balance in estuaries. A least-squares fit to semidiurnal and quarter-diurnal harmonics was used to separate the tidal and subtidal contributions to the observed flow. The period of observation was characterized by onshore winds and subtidal inflow everywhere along the transect sampled but strongest in the channel. Spatial gradients in both the tidal and subtidal horizontal flows showed that the greatest lateral shears and convergences were found where the bathymetric changes were sharpest, i.e., on the shoulders of the channel. The ratio of the quarter-diurnal to the semidiurnal tidal amplitudes was greatest over the channel shoulders, for both the along- and across-estuary flow components, and indicated the importance of non-linear effects there. The nonlinear term caused by across-estuary divergence was larger than the Coriolis term over the channel shoulders. The nonlinear contribution was comparable to the Coriolis acceleration in the subtidal and tidal lateral momentum balances. For the tidal balance, the local accelerations were also as important as the Coriolis accelerations. Equivalent results in the momentum balances were obtained with another data set of October 1993. Contrary to the customary assumption, the across-estuary momentum balance in this area was ageostrophic.

Keywords

Momentum Balance Tidal Flow Tidal Amplitude Lateral Shear Coriolis Acceleration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Estuarine Research Federation 1999

Authors and Affiliations

  1. 1.Center for Coastal Physical Oceanography Department of Ocean, Earth and Atmospheric SciencesOld Dominion UniversityNorfolk

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