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Full-Text Articles in Physical Sciences and Mathematics
Exchange Hydrodynamics Between A Subestuary And Its Adjacent Estuary, Diego A. Narváez
Exchange Hydrodynamics Between A Subestuary And Its Adjacent Estuary, Diego A. Narváez
OES Theses and Dissertations
Four oceanographic surveys and two periods of moored data were analyzed to describe the subtidal exchange hydrodynamics between a subestuary (Nansemond River) and its adjacent estuary (James River) in the lower Chesapeake Bay. The surveys were carried out during two semidiurnal periods (~25 hrs), which included two spring and two neap tides. Velocity profiles and hydrographic data were recorded over an area ~4 km long and ~1 km wide allowing a spatial resolution rarely obtained with observational data. The results obtained in the surveys were extended with instruments deployed at the entrance to the subestuary during winter and summer time …
Continuously Stratified Flow Dynamics Over A Hollow, David Salas-Monreal
Continuously Stratified Flow Dynamics Over A Hollow, David Salas-Monreal
OES Theses and Dissertations
Acoustic Doppler current profiles (ADCP) and density profiles were measured over three lower Chesapeake Bay bathymetric depressions (hollows) in order to determine the effects of a hollow on a continuously stratified flow. Measurements showed an acceleration of the near-bottom flow as it moved toward the deepest part of the hollows, in contrast to the deceleration expected from two-dimensional Bernoulli-type dynamics. The acceleration was attributed to lateral water intrusions that were most apparent during floods. The presence of lateral water intrusions was corroborated by observations in a transverse section that crossed the deepest part of the hollows. The observed deceleration of …
Tidally Induced Variability At The Chesapeake Bay Entrance, María Andrea Piñones
Tidally Induced Variability At The Chesapeake Bay Entrance, María Andrea Piñones
OES Theses and Dissertations
Time series of current velocity from 6 stations at the Chesapeake Bay entrance were used to study the variability of tidal currents. Particular emphasis was placed on the semidiurnal tidal currents, which explains ~ 70% of the variability of tidal currents. Four different deployments that spanned more than one year showed that the vertical structure of the semidiurnal tidal currents vary seasonally in response to changes in water column stratification. Under destratified conditions favored by wind forcing, the semidiurnal tidal currents rotated cyclonically throughout the water column, thus emulating a Kelvin wave. In contrast, during stratified conditions the tidal currents …