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Input Projects
St. Clair 1D HEC-RAS Modelling
St. Clair Bathymetric Data Analysis
Dependent Projects
Residual NBS

Detection of Conveyance Changes in St. Clair River Using Historical Water-Level and Flow Data with Inverse One-Dimensional Hydrodynamic Modeling

David Holtschlag;C.J. Hoard
Trends in gauge pair water-level fall and conveyance ratios were found to show changes in conveyance in the St. Clair R. are likely occurring. Inverse 1-D hydrodynamic modeling was used to estimate a partial annual series of effective channel-roughness parameters in reaches forming the St. Clair River for 21 years when flow measurements were sufficient to support parameter estimation. Changes in estimated effective channel roughness with time were interpreted as systematic changes in conveyances in five reaches. Time-varying parameter estimates were used to simulate flow and compute changes in conveyance with time, which showed conveyance in the St. Clair River increased about 10% from 1962 to 2002, and decreased about 4.1% from 2003 to 2007, so that conveyance was about 5.9% higher in 2007 than in 1962.
Detection of Conveyance Changes in St. Clair River
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 Inverse HEC-RAS Model Files
Universal Parameter Estimation Code (UCODE) Software (Link)
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