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GLERL 2006 Milestone Reports
< GLERL 2006 Milestone main page
GOAL 1: Ecosystem
Scientist: Dave Schwab (GLERL)
NOAA Program: Ecosystem Research
OAR Performance Measure: Research to improve our understanding of the factors affecting ecosystems and the success of ecosystem approaches to management.
NOAA Performance Objective: Assess, model and forecast ecosystem resources for management decisions
Ecosystem Research Program Performance Measure: PM5: Cumulative number of tools and technologies that improve ecosystem-based management.
Milestone: Develop and apply nested-grid hydrodynamics forecasting model to Burns Ditch, Indiana area and compare results with in situ current meter measurements.
Purpose:
Develop a three-dimensional hydrodynamic modeling system based on the Great Lakes Coastal Forecasting System for forecasting E. coli and Enterococci concentrations along Great Lakes coasts.
Efforts and Results (to date): The Great Lakes version of the Princeton Ocean Model, which is used in the Great Lakes Coastal Forecasting System, has been adapted to accommodate an open-boundary nested grid with very high spatial resolution (100 m grid spacing) for selected beach areas. The nested grid is linked to the whole-lake circulation model at the open boundaries through three-dimensional boundary conditions for currents, water level elevation, and water temperature which change at hourly intervals. The nested grid model has been tested for the Burns Ditch, Indiana area throughout the summer season of 2005. During this period, GLERL had deployed several current meters and conducted a dye release experiment to provide model validation data. Comparisons of the model results with the in situ data have been favorable.
Figure 1. Location map
Figure 2. Nested hydrodynamic model grid
Figure 3. Observed (top) and modeled (bottom) longshore currents at Burns Ditch for 10 days in 2005. The black line is the vertically integrated currents. Colored lines are currents at different depths ranging from blue near the bottom to red near the surface.
Customer(s): This modeling system will eventually be coupled with a bacterial source and transport model. A user-friendly interface will ultimately be developed for beach managers and others responsible for beach safety to predict the potential for contamination based on various loading scenarios, allowing them to make decisions about beach closings in a timely manner.
Cause Factors (if milestone not met): N/A
Revised Completion Date (if milestone not met): N/A
Last updated: 2006-09-19 mbl