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Impacts of Glacial Isostatic Adjustment on the Estimated Reduction in Lake Michigan-Huron - Erie Head Difference Over Time

Chuck Southam;Frank H. Quinn
The overall impacts of glacial isostatic adjustment (GIA) on the estimated reduction in Lake Michigan-Huron to Erie (MH-E) head difference was assessed and summarized in a series of reports. An initial synthesis report by Quinn and Southam (2008) investigated the physical and apparent impacts of GIA on historical water levels and the MH-E head difference, focusing on the 1860-2010 period, and concluded that the MH-E fall relationship should be based on the differences between water levels recorded at the lake gauges located closest to the outlet of each lake. This earlier analysis was expanded upon by Southam (2009) to provide comparisons based on the 1963-2003 time period, and based on these short-term analysis results, it was decided to re-visit some of the assumptions made during the earlier study in order to provide an accurate estimate of the impacts of GIA on the MH-E fall diagram.
Impact of Datum Changes on Lake Huron to Lake Erie Fall
Impact of GIA on Fall between Lake Huron and Lake Erie
The Fall between Lakes Huron and Erie
GIA Impact on Head Difference: Harbor Beach & Cleveland Data
Viewable Data:
Coordinated Great Lakes Lake-Wide Monthly Mean Water Levels
Great Lakes Gauge Stations Monthly Mean Water Levels
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Supporting Content (Show)
Main Topics
St. Clair River
Questions We Asked
How has GIA affected Michigan-Huron and Erie level relationship?
Key Findings
GIA accounts for 4-5 cm of total head decline
Remedial measures should not be taken in the St. Clair
Glacial Isostatic Adjustment Analysis