Revised Rates of Vertical Movement Relative to Lake Outlet Summary Document Jacob Bruxer August 13, 2010

Transcription

1 Revised Rates of Vertical Movement Relative to Lake Outlet Summary Document Jacob Bruxer August 13, 2010 For more detailed information, see: Bruxer, J.K. and Southam, C. (2008). Review of Apparent Vertical Movement Rates in the Great Lakes Region. Report for the International Upper Great Lakes Study. The following tables and diagrams give the most recently computed (including data up to 2006) rates of vertical movement (cm/century) at gauge stations on each of the Great Lakes, relative to their outlet, as determined from water level differences over time. For example, a rate shown as 24 would indicate that this gauge station (more specifically, the land at this station) is rising at a rate of 24 cm/century relative to the outlet of the lake; it follows that the water level at this gauge location would appear to be decreasing at 24 cm/century. The rates shown are based on results presented by Bruxer and Southam (2008), and are believed to be the current best estimates; however, due to uncertainty in the analysis, a couple additional notations have been added to the diagrams: [Numbers in brackets indicate a range of rates that could be attributed to the gauge station, depending on the period of water level record used, removal of outliers, etc] Numbers in red indicate rates of movement that are questionable and may not represent what is actually occurring at this location for any number of reasons (e.g. local instability, short period of water level record available, etc.)

2 Table 1: Lake Superior Rates of Vertical Movement relative to outlet at Point Iroquois, MI Gauge Rate of Vertical Movement (cm/century) Point Iroquois, MI 0 Marquette, MI [ 11 to 8] Ontonagon, MI 17 Duluth, MN [ 29 to 27] Two Harbors, MN 20 Grand Marais, MN 10 Thunder Bay, ON [1 to 4] Rossport, ON 15 Michipicoten, ON [21 to 23] Gros Cap, ON [ 1 to 0] Figure 1: Lake Superior gauge locations.

3 Table 2: Lakes Michigan Huron Rates of Vertical Movement relative to outlet at Lakeport, MI Gauge Rate of Vertical Movement (cm/century) Lakeport, MI 0 Harbor Beach, MI 3 Essexville, MI 3 Harrisville, MI 8 Mackinaw City, MI [12 to 14] Ludington, MI [ 13 to 8] Holland, MI [ 9 to 6] Calumet Harbor, IL 10 Milwaukee, WI [ 15 to 11] Kewaunee, WI [ 7 to 1] Sturgeon Bay Canal, WI [ 5 to 1] Green Bay, WI 6 Port Inland, MI 10 De Tour Village, MI 18 Thessalon, ON [22 to 24] Little Current, ON [24 to 29] Perry Sound, ON 24 Collingwood, ON [12 to 17] Tobermory, ON 18 Goderich, ON [ 3 to 0] Figure 2: Lakes Michigan Huron gauge locations.

4 Table 3: Lake Erie Rates of Vertical Movement relative to outlet at Buffalo, NY Gauge Rate of Vertical Movement (cm/century) Buffalo, NY 0 Sturgeon Point, NY 1 Barcelona, NY 6 Erie, PA 8 Fairport, OH 22 Cleveland, OH [ 9 to 7] Marblehead, OH 7 Toledo, OH [ 13 to 6] Monroe, MI 25 Fermi Power Plant, MI 10 Bar Point, ON 19 Kingsville, ON 10 Erieau, ON 6 Port Stanley, ON [ 3 to 2] Port Dover, ON 2 Port Colborne, ON [ 5 to 0] Figure 3: Lake Erie gauge locations.

5 Table 4: Lake Ontario Rates of Vertical Movement relative to outlet at Cape Vincent, NY Gauge Rate of Vertical Movement (cm/century) Cape Vincent, NY 0 Oswego, NY 4 Rochester, NY 8 Olcott, NY 13 Port Weller, ON [ 17 to 14] Port Dalhousie, ON 15 Burlington, ON 24 Toronto, ON 11 Cobourg, ON 9 Kingston, ON [ 3 to 3] Figure 4: Lake Ontario gauge locations.

6 Figure 5: Summary of Great Lakes rates of vertical movement relative to their lake outlet

7 Figure 6: Lake Superior rates of vertical movement relative to outlet at Point Iroquois, MI

8 Figure 7: Lakes Michigan Huron rates of vertical movement relative to outlet at Lakeport, MI

9 Figure 8: Lake Erie rates of vertical movement relative to outlet at Buffalo, NY

10 Figure 9: Lake Ontario rates of vertical movement relative to outlet at Cape Vincent, NY