University of Minnesota
LacCore
http://laccore.org
(612) 626-7889
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College of Science & Engineering > Dept. of Earth Sciences > Limnological Research Center > LacCore

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Gravity Corer

Description

Gravity corers are single-drive corers deployed on a rope, and lowered into the sediment under their own weight to recover an undisturbed sample of the near-surface sediments. The LacCore gravity corer uses standard polycarbonate tube (70mm outer diameter, 2mm wall thickness; LacCore stocks thousands of meters and sells to the community) of any length. Penetration depth is determined by the amount of weight on the core head, which can range from 5 to 30kg, and core recovery is typically in the range of 1m. A valve in the core head closes when the deployment rope becomes slack, and provides suction during recovery.

Images

Gravity corer in use.

Gravity corer in use.