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Southeastern Section - 50th Annual Meeting (April 5-6, 2001)

Paper No. 0
Presentation Time: 10:20 AM

APPLICATION OF A BROWARD COUNTY GROUNDWATER MODEL, USING MODFLOW WITH WETLAND AND DIVERSION PACKAGES, TO SIMULATE WATER LEVELS IN THE EVERGLADES SYSTEM


JORGE, Restrepo1, GIDDINGS, Jeff2, GARCES, David1 and RESTREPO, Natalia1, (1)Geography-Geology, Florida Atlantic Univ, Geography-Geology Dpt, 777 GLADES RD, Boca Raton, FL 33431, (2)South Florida Water Mgnt District, 3301 Gun Club Rd, West Palm Beach, FL 33406, restrepo@fau.edu

The Broward County groundwater model has been developed as a predictive model to provide a tool that can be used by the South Florida Water Management District (SFWMD) to analyze different water management scenarios including water supply plans and the Comprehensive Everglades Restoration Plan (CERP). The model was developed using a modified version of the USGS three-dimensional finite difference flow code (MODFLOW-96). This version includes the wetland and Diversion packages, which are MODFLOW modules that enable the top layer of the grid system to include overland flow through dense vegetation and channel flow through a slough network, and thus more closely simulate the natural system.

The model domain is discretized into 456 rows by 371 columns with a uniform cell size. Each cell is 500 ft x 500 ft includes and four horizontal layers representing lithologic zones within the surficial aquifer, one of the most transmissive aquifers in the world, with hydraulic conductivity up to 40,000 ft/day.

The main advantage of this model, besides is high detail, is that it simulates the hydroperiods within the wetland areas using the Wetland and Diversion packages. This packages has the ability to represent on a daily basis the wetland system, including sources/sinks. The use of these additional packages allows the model represent the full hydrologic cycle within the wetland areas starting with the total precipitation as a driving force.

During the model calibration (1988-1990) was observed a very low sensitivity to changes in conductivity and General Head Boundaries conductances, therefore the fit between the model-computed water levels and the observed historical groundwater levels was achieved mainly by adjusting canal conductance and wetland parameters within the active domain. The model show high sensibility to the operation rules -the stage at which the channel levels are maintained- behaving accordingly to the way the system is handled.

Session No. 29

S2. Groundwater Conditions in Coastal Aquifer Systems: Past, Present, and Future
Friday, 6 April 2001: 8:15 AM-12:00 PM
Geological Society of America Abstracts with Programs. Vol. 33, No. 2, March 2001
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