Dekshenieks, M. M. University of Rhode Island, deks@holo.gso.uri.edu
Donaghay, P. L. University of Rhode Island, donaghay@gsosun1.gso.uri.edu
Osborn, T. R. The Johns Hopkins University, osborn@jhu.edu

 
FACTORS CONTROLLING THE CIRCULATION IN EAST SOUND AND THE CONCOMITANT GENERATION OF THIN LAYERS
 
Measurements of currents, density and optical profiles, winds, and tides in East Sound, WA reveal complex circulation patterns and thin layers. Variability in the thin layers can be related to the four basic patterns for the currents, associated with the possible combinations of flood or ebb tides, with winds up or down the Sound. Profiles of the currents show a layered flow with a vertical scale of a few meters (2 to 8m). The strongest shears arise when the wind and the tide are in opposition and/or when an intense, surface jet is present in the upper Sound (formed during periods with a strong wind blowing up the Sound on either ebb or flood tide). The vertical shear of the horizontal currents is well resolved with values as large as 0.1/sec. Simultaneous measurements of the shear, density profile and optical characteristics show that over 50% of the thin layers are in regions where the shear exceeds 0.025/sec. Normally flushing is low, so that biological activity in the Sound can lead to patch formation. However, substantial changes in the density profile of the water outside the mouth of the Sound can occasionally induce a density driven circulation that flushes out the entire Sound in about 2 days, completely changing the layered structures.
 
Day: Tuesday, Feb. 2
Time: 08:45 - 09:00am
Location: Hilton of Santa Fe
 
Code: SS05TU0845H