| Résumé | The Hydraulics Working Group of the International Upper Great Lakes Study is investigating apparent changes which may have occurred in the St Clair River in the last few decades.
For this purpose, several numerical models have been prepared in order to help in understanding the impacts of these changes by simulating various scenarios where the bathymetry of the River, its morphology, its bed material content or its bottom friction would be modified.
Numerical models are developed using different assumptions so that they can best represent certain aspects of the physical problem. Therefore they vary in the representation of the physical description of the River, the representation of the hydrodynamics of the River, or in the numerical methods used to solve the fluid hydrodynamics. Each model is different and will give different solutions to the same problem.
It is therefore important to compare the results from several models to be able to appreciate the variability in the solutions.
The International Joint Commission retained the services of the Canadian Hydraulics Centre (CHC) of the National Research Council, to prepare one of these numerical models, so that its results can be compared with similar models. CHC chose Telemac-2D, a commercially available two-dimensional model.
This report describes the preparation of this model with its calibration, and it presents the results of various scenarios which have been simulated looking at changes on the St Clair River. Since this project involved many simulations, the run numbers are identified for future reference. |
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