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locally-forced wind effects on shallow waters with emergent vegetation
Locally-Forced Wind Effects on Shallow Waters with Emergent VegetationHarry L. Jenter and Michael P. Duff
Introduction
Over the past century, the Everglades region of south Florida has experienced
dramatic declines in the health and abundance of many of the plant and animal
species that make it one of the world's most unique ecosystems. These declines
have been attributed in large part to anthropogenically influenced changes in the
quality and quantity of water entering the Everglades. Residential, commercial
and agricultural use of water in south Florida has dramatically altered the timing,
location and volume of its delivery to the wetlands.
As part of regional plans to restore the health of the ecosystem and to bolster the
plant and animal populations, changes in methods used for water storage,
treatment, and delivery are being proposed. Many of these changes are
expensive, extensive, and sometimes at odds with each other. Consequently,
there is great interest in being able to predict the effects of any changes before
they are implemented. Toward this end, a numerical fate and transport model of
flow in the Taylor Slough area of the Everglades is being developed at the U. S.
Geological Survey (USGS) as part of its South Florida Place-Based Study Program.
A reliable fate and transport model requires both sound characterization of the
physical processes governing the flow and accurate representation of the domain
being modeled. In the Everglades, a model must include characterization of the
effects of wind on flow patterns as well as characterization of vegetative
resistance, rainfall, evapotranspiration, ground-water/surface-water exchange,
and canal/wetland interaction. A model of the Everglades must also include
skillful mapping of the topography and overlying vegetation populations. Projects
at the USGS are dedicated to the study of each of these.
The project described in this paper was designed to determine the effects of wind
on flow in shallow waters with emergent vegetation, such as those found in the
Everglades. Little is known about these effects, and very few attempts have
been made to include them in numerical flow models (Reid and Whitaker, 1976).
Therefore, laboratory experiments, supplemented by the analysis of historical
south Florida wind data, were designed and conducted to determine the
magnitudes, time scales, and spatial scales relevant to wind forcing in the
Everglades and to the USGS fate and transport model.
(This paper is from the proceedings of the Third International Symposium on Ecohydraulics CDROM) Related information:
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U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 06 December, 2004 @ 03:34 PM(TJE)