The HTH sediment corer |
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| Authors: | Ingemar Renberg Hans Hansson |
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| Institution: | 1. Department of Ecology and Environmental Science, Ume? University, SE-901 87, Ume?, Sweden
2. HTH-Teknik, V?rv?gen 37, SE-976 31, Lule?, Sweden
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| Abstract: | Gravity corers have been in use for a long time and in many different configurations. There are, however, reasons for improvements
since new manufacturing materials have become available, and demands for accurate coring and sub-sampling in both research
and environmental monitoring have increased. The HTH-coring equipment, which has been tested for >10 years by several users,
is a further development of the Kajak-corer concept and has some unique features which are described here. To avoid contamination
in pollution studies, the equipment is made of stainless steel and plastic (polyoxymethylene and polyethylene), and the use
of these materials also makes the equipment more durable. The extruding device is the main improvement over previous versions.
It consists of a piston that seals perfectly to the core tube wall, a threaded rod that can be mounted on a foot plate, and
an extruder head with a stationary upper-half and a rotatable lower-half that is screwed along the rod. One 360°-turn gives
a 5-mm thick sediment increment that is scraped off using the sectioning tray. Sub-sampling is quick and accurate and can
be performed by one person. The equipment is constructed to allow coring and sub-sampling both in summer and winter. |
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| Keywords: | Sediment Gravity corer Surface sediment |
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