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Input Projects
St. Clair Bathymetric Data Analysis
Dependent Projects
St. Clair 1D HEC-RAS Modelling
St. Clair and Detroit 2D TELEMAC Modelling
View all 3 dependent projects
Residual NBS

Two-Dimensional Hydrodynamic Modelling of the St. Clair River using RMA2



Contributors
Jacob Bruxer;Aaron Thompson
Abstract
A two-dimensional hydrodynamic model of the St. Clair River was developed using RMA2 to estimate the impacts of changes in bathymetry over time on water levels and flows of Lake Michigan-Huron, and uncertainty caused by uncertainty in the bathymetric data. Bathymetric data density was shown to significantly influence model results. When data of equal density were used, Lake Huron water levels were found to be lowered by 12 +/- 3 cm from 1971 to 2007 due to bathymetric changes, but were 3 +/- 2 cm higher from 2000 to 2007. Differences were the result of bathymetric changes occurring throughout the channel, rather than at any specific location or due to any small-scale features. A comparison of actual paired flow measurements helped confirm modelled conveyance change results.
Reports:
St. Clair River 2D RMA2 Hydrodynamic Modelling: Phase 1
St. Clair River 2D RMA2 Hydrodynamic Modelling: Phase 2
St. Clair River 2D RMA2 Hydrodynamic Modelling: Addendum
Viewable Data:
St. Clair River Channel Bathymetry
Upper St. Clair River Bathymetry
St. Clair River Discharge Measurements (1962-2006)
Models:
RMA2 Software (Link)
St. Clair River RMA2 Models
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
Recommendations
Remedial measures should not be taken in the St. Clair
Tasks
St. Clair River Hydraulics Analysis
Hydrodynamic Modelling