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CHS – Kempenfelt Bay Multibeam Echosounder Data\Mapping. Canadian Hydrographic Multibeam Echosounder data. Strawberry Island and Shoal. Lake Simcoe Substrate Mapping. Most of the lake has been mapped using a 2 km grid.

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lake simcoe substrate mapping
Lake Simcoe Substrate Mapping

Most of the lake has been mapped using a 2 km grid.

Higher density sampling was undertaken for Kempenfelt Bay, Strawberry Island\Shoal and Georgina Island

Acoustic data have been edited and sediment samples for ground truthing are being processed.

survey effort
Survey Effort

189,487 dual frequency sounding

Sediment layer of interest is between the lake bottom and the depth of the first horizon in the sediment profile

22 sediment cores were collected to determine phosphorus concentration profiles


High-frequency return

Lake bottom

Low-frequency return

Bottom of first (contemporary)

sediment layer

Sediment Thickness:

(LF depth-HF depth)


map of the thickness of the contemporary sediment layer
Map of the Thickness of the Contemporary Sediment layer

model of sediment thickness of the sediment layer ranging from 0.05 to 4.5 m

Also shown are the locations of the core sites used to measured sediment concentration profiles of total phosphorus and other constituents

Data have been edited and ingressed into GIS

Model development to estimate in situ mass is ongoing

collection of sediment cores
Collection of Sediment Cores

Cores were collected at 22 sites during the winter (February, 2011)

sediment concentration of total phosphorus
Sediment Concentration of Total Phosphorus

Concentration grouped by core intervals indicate concentrations are spread over a wide range

Surface concentrations (0-5 cm) are comparable for all of Cook’s Bay (below)

South to North