crew working on the Kullenberg
crew working on the Kullenberg

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Kullenberg

The Kullenberg corer (Kullenberg, 1947; Kelts et al., 1986) is a single-drive, wire-deployed piston corer that is dropped into the sediment from a short distance (typically 0 to 3m), propelled by the momentum of the heavy (~1000 pounds/450 kg) lead weights on the core head.

Cores are recovered in steel pipes lined with plastic tubes (standard polycarbonate for the LacCore system). The corer drop is triggered when a gravity corer, suspended on a second wire to the side of the Kullenberg corer, enters the sediment and ceases downward travel—thus most Kullenberg cores have an accompanying gravity core that captures the upper sediments that are disturbed by the long corer. The range of water depths is limited only by the length of wire on the winch. However, the immense weight of the system requires a substantial secondary apparatus to handle the corer. A heavy-duty winch and hydraulic system or power supply must be employed to raise and lower the corer, and if long core barrels are used to increase the depth of recovery, a tower or A-frame must be available for deployment and recovery. A minimum of two facility staff plus four additional hands are required for safe operation.

Type:
Gravity, Single-drive, Trigger-release, Wire Deployed
Minimum Water Depth (m):
2
Maximum Water Depth (m):
limited by wire length (350m)
Maximum Sediment Depth (m):
12
Dimensions and Weight:
680 kg plus long steel tubes, without platform
Minimum Open-Water Deployment Requirement:
platform/vessel with 1-ton winch, and tower with moonpool or A-frame
Core Diameter/Profile (cm):
7
Lithologies:
Fine-grained, Soft Sediment