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One-Dimensional Hydrodynamic Modelling of the St. Clair River using HEC-RAS

Jason Giovannettone;
A one-dimensional HEC-RAS model of the St. Clair River was created in order to address concerns involving a lowering of the water levels of Lake Huron resulting from morphological changes in the riverbed over the last 40+ years. The model was initially developed using measured bathymetry data from 2007, and calibrated to flows measured between 1996 and 2006. Sensitivity analyses were performed to determine the effects of near-shore interpolation, glacial isostatic adjustment and the effect of small-scale features in the upper river. Further tests were then conducted using previously collected bathymetric data, with a 2007 bathymetric dataset of the same resolution as an existing 1971 bathymetric dataset created, and the two compared.
St. Clair River 1D HEC-RAS Hydrodynamic Modelling
Viewable Data:
St. Clair River Channel Bathymetry
Upper St. Clair River Bathymetry
St. Clair River Discharge Measurements (1962-2006)
HEC-RAS Software (Link)
St. Clair River HEC-RAS Models (Giovannettone)
Additional Data and Information

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Supporting Content (Show)
Main Topics
St. Clair River
Questions We Asked
What's causing the declining head difference?
Has St. Clair conveyance changed, and if so, what were the causes?
Key Findings
St. Clair River has changed, accounting for 7-14 cm of total head decline
Evidence suggests St. Clair erosion is not ongoing, but causes remain unknown
Remedial measures should not be taken in the St. Clair
St. Clair River Hydraulics Analysis
Hydrodynamic Modelling