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DynaRICE Modeling to Assess the Effect of the 1984 Ice Jam on Possible Bed Changes in the St. Clair River

Tomasz Kolerski;Hung Tao Shen
The effect of the record ice jam of 1984 in the St. Clair River on river bed changes and conveyance was investigated using the river ice dynamic model DynaRICE. Simulations were used to examine the flow and bed shear stress during the jam formation and release periods. Results indicate that the ice jam in the river did not cause a significant increase in bed shear stress compared to pre and post-jam open water conditions, and therefore the jam may not have had a significant direct impact on the channel conveyance, although an analysis with a coupled ice-sediment model may further clarify whether the jam has caused bed changes. The insignificant change on bed shear stress during the ice jam period is considered to be due to the limited backwater effect of the jam as it is constrained by the level difference between Lake Huron and Lake St. Clair, as well as the large depth of river flow relative to the jam thickness.
St. Clair River Ice Jam Modelling
Viewable Data:
St. Clair River Channel Bathymetry
DynaRICE Modelling of 1984 Ice Jam Impact on St. Clair River
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Supporting Content (Show)
Main Topics
St. Clair River
Questions We Asked
Has St. Clair morphology changed since 1962, what initiated it, and when?
Has St. Clair conveyance changed, and if so, what were the causes?
Key Findings
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