Modeling of wind-induced destratification in Chesapeake Bay View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1990-09

AUTHORS

Alan F. Blumberg, David M. Goodrich

ABSTRACT

It has been observed that storms in early fall can result in top-to-bottom mixing of Chesapeake Bay. A three-dimensional, time-dependent circulation model is used to examine this destratification process for September 1983, when extensive current and hydrographic data were available. The model bay is forced at the surface by observed hourly winds, at the ocean boundary by observed hourly surface and bottom salinities and sea level fluctuations, and at the head by observed daily discharges for a 28-d period. A second-moment, turbulence-closure submodel, with no adjustments from previous applications to its requisite coefficients, is used to calculate the vertical turbulence mixing coefficients. Comparisons with data inside the model domain indicate relative errors of 7% to 14% for sea level, 7% to 35% for current, and 11% to 21% for salinity. The tidal portion of the spectrum is modeled better than the subtidal portion. The model is used to examine both the mechanisms of wind mixing and the temporal and spatial distribution of vertical mixing within the estuary. Wind-driven internal shear is shown to be a more effective mechanism of inducing destratification than turbulence generated at the surface. The model is also used to show that the vertical temperature inversion which occurs in the fall does not affect the timing of the destratification as much as its completeness. The distribution of mid-depth vertical mixing shows highly variable values in the mid-bay region, where wind-induced mixing is dominant. This suggests that the source of oxygen to mid-bay bottom waters is similarly variable. Vertical turbulence mixing coefficients of 10−2 cm2 s−1 (background) to 103 cm2 s−1 were needed to simulate the September period, indicating the need for time-variable mixing in models of dissolved and suspended estuarine constituents. More... »

PAGES

236-249

References to SciGraph publications

Journal

TITLE

Chesapeake Science

ISSUE

3

VOLUME

13

Identifiers

URI

http://scigraph.springernature.com/pub.10.2307/1351914

DOI

http://dx.doi.org/10.2307/1351914

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028615166


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