**The title, authors, and abstract for this completion
report are provided below. For a copy of
the completion report, please contact the GLFC via e-mail or via telephone at 734-662-3209**
High-resolution
bathymetry surveying of the nearshore zone off
Drummond Island, Lake Huron
Nigel J. Wattrus2
2 Large Lakes
Observatory,
University
of Minnesota – Duluth
10
University Drive
Duluth,
Minnesota 55812
March 2012
ABSTRACT:
Over 80 km 2 of high-resolution multibeam
sonar bathymetry and backscatter imagery were collected in the nearshore zone (water depth < 65 m) off Drummond Island
in northern Lake Huron as part of a larger study to use a large hydrophone
array to track the behavior of spawning lake trout fitted with acoustic tags.
The goals of the multibeam survey were to: a)
generate high-resolution bathymetric information for the study site; b)
generate backscatter imagery of the study site; c) classify the substrate in
key areas of the study area that is based upon its acoustic response. The data
reveal an extensive field of north-south directed ridges composed of coarse
gravel, cobble and boulders that are interpreted to be a relict drumlin field
that formed below the Laurentide Ice Sheet during the
last glaciation of the area. The orientation of the
ridges reflects the flow direct of the ice sheet.