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.
KeywordsMomentum Balance Tidal Flow Tidal Amplitude Lateral Shear Coriolis Acceleration
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- Browne, D. R., andC. W. Fisher. 1988. Tide and tidal currents in the Chesapeake Bay. Technical Report NOS OMA. 3. National Oceanic and Atmospheric Adminstration, Rockville, Maryland.Google Scholar
- Chant, R. J., andR. E. Wilson. 1997. Secondary circulation in a highly stratified estuary.Journal of Geophysical Research 102(23):207–215.Google Scholar
- Friedrichs, C. T., andJ. M. Hamrick. 1996. Effects of channel geometry on cross-sectional variation in along channel velocity in partially stratified estuaries, p. 283–300.In D. G. Aubrey and C. T. Friedrichs (eds.), Buoyancy Effects on Coastal and Estuarine Dynamics. Coastal and Estuarine Studies, Volume 53. Am. Geophys. Union. Washington, D. C.Google Scholar
- Hansen, D. V., andM. Rattray. 1965. Gravitational circulation in straits and estuaries.Journal of Marine Research 23:104–122.Google Scholar
- Parker, B. B.. 1991. The relative importance of the various non-linear mechanisms in a wide range of tidal interactions, p. 237–268.In B. B. Parker (ed.), Tidal Hydrodynamics, J. Wiley and Sons, New York.Google Scholar
- Pritchard, D. W.. 1954. A study of the salt balance in a coastal plain estuary.Journal of Marine Research 13(1):133–144.Google Scholar
- Pritchard, D. W.. 1956. The dynamic structure of a coastal plain estuary.Journal of Marine Research 15(1):33–42.Google Scholar
- Stewart, R. W. 1957. A note on the dynamic balance for estuarine circulation.Journal of Marine Research 16:34–39.Google Scholar
- Valle-Levinson, A., andJ. O'Donnell. 1996. Tical interaction with buoyancy driven flow in a coastal plain estuary, p. 265–281.In D. G. Aubrey and C. T. Friedrichs (eds.), Buoyancy Effects on Coastal and Estuarine Dynamics, Coastal and Estuarine Studies, Volume 53. Am. Geophys. Union, Washington, D.C.Google Scholar