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GLIN==> May 20 Seminar - Ann Arbor



  NOAA GREAT LAKES SEMINAR SERIES
http://www.glerl.noaa.gov/news/seminars/


Date: Tuesday, May 20,2003

Title: "Modelling Transport in Lakes"

Speaker: Dr. Bernard Laval
Assistant Professor, Department of Civil Engineering, University of
    British Columbia, Vancouver, B.C.

Time: 10:00 a.m.

Where:
GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI 48105
For directions:
http://www.glerl.noaa.gov/facil/triptik.html

Abstract:
The influence of spatial and temporal variations in wind forcing on the
mass flux within lakes is investigated using field data and numerical
modelling applied to two dynamically different lakes: Lake Kinneret and
Lake Maracaibo. Consideration of the horizontally-averaged wind stress
improves modeling of the basin-scale internal waves in Lake Kinneret.
Additionally, a spatially varying wind field is essential for
simulating mean surface circulation, which is shown to be predominantly
forced by the surface-layer-averaged wind stress moment. In
perennially salt-stratified Lake Maracaibo, a spatially-varying wind
forcing is necessary to simulate the observed basin-scale cyclonic
gyre. This gyre maintains a doming of isopycnals through a geostrophic
balance. Doming lifts high-salinity bottom water closer to the surface
where it can be entrained into the surface mixing layer and
subsequently advected by wind-induced circulations. Baroclinic
exchange of salt between Lake Maracaibo and the Gulf of Venezuela is
along a 100 km long, 15 m deep dredged shipping lane. This baroclinic
exchange is modulated by barotropic circulation which varies the
following time scales: 1) tides (semi-diurnally, diurnally, and
fortnightly); 2) wind (diurnally and longer); and 3) river inflow
(seasonally). The combination of strong wind-forcing and low river
inflow during the dry season of 1999 results in almost complete
flushing of saline bottom water.

For more information, contact:
    David Schwab
    734-741-2120
    David.Schwab@noaa.gov



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Posted by:

David F. Reid, Ph.D.
U.S. Department of Commerce
National Oceanic and Atmospheric Administration
Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.
Ann Arbor, MI 48105-2945
Voice: 734-741-2019
FAX: 743-741-2055
GLERL home page:
http://www.glerl.noaa.gov



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