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Horizontal density-gradient effects on simulation of flow and transport in the Potomac Estuary

By:
and
Edited by:
Chang Howard H.Hill Joseph C.

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Abstract

A two-dimensional, depth-integrated, hydrodynamic/transport model of the Potomac Estuary between Indian Head and Morgantown, Md., has been extended to include treatment of baroclinic forcing due to horizontal density gradients. The finite-difference model numerically integrates equations of mass and momentum conservation in conjunction with a transport equation for heat, salt, and constituent fluxes. Lateral and longitudinal density gradients are determined from salinity distributions computed from the convection-diffusion equation and an equation of state that expresses density as a function of temperature and salinity; thus, the hydrodynamic and transport computations are directly coupled. Horizontal density variations are shown to contribute significantly to momentum fluxes determined in the hydrodynamic computation. These fluxes lead to enchanced tidal pumping, and consequently greater dispersion, as is evidenced by numerical simulations. Density gradient effects on tidal propagation and transport behavior are discussed and demonstrated.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Horizontal density-gradient effects on simulation of flow and transport in the Potomac Estuary
ISBN:
0872627748
Year Published:
1990
Language:
English
Publisher:
Publ by ASCE
Publisher location:
Boston, MA, United States
Larger Work Title:
Hydraulic Engineering - Proceedings of the 1990 National Conference
First page:
1251
Last page:
1256
Number of Pages:
6
Conference Title:
Hydraulic Engineering - Proceedings of the 1990 National Conference
Conference Location:
San Diego, CA, USA
Conference Date:
30 July 1990 through 31 July 1990