Seabed

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	Quelques documents de Seabed
	Deep-sea hammer corer 1992 - 1996 Sujets : Environmental Protection, Resources of the Sea, Fisheries Type de contrat : Cost-sharing contracts Participants : Geomar Technologie GmbH DEUTSCHLAND Geomar Technologie GmbH Industry Wischhofstraße 1-3 24148 DEUTSCHLAND Seabed BV NEDERLAND Seabed BV Industry PO Box 155 1560 AD NEDERLAND NORWEGIAN GEOTECHNICAL INSTITUTE NORGE NORWEGIAN GEOTECHNICAL INSTITUTE Research,Other 3930 Ulleval St SOGNSVEIEN 72 0806 NORGE NERC British Geological Survey UNITED KINGDOM NERC British Geological Survey Non Commercial Nicker Hill NG12 5GG UNITED KINGDOM Federal Institute for Geosciences and Natural Resources DEUTSCHLAND Federal Institute for Geosciences and Natural Resources Research Postfach 51 01 53 Stilleweg 2 30655 DEUTSCHLAND Geomar Technologie Germany Geomar Technologie Industry Wischhofstraße 1-3 Germany Seabed Netherlands Seabed Industry PO Box 155 AD Netherlands Hide general information The provision of long, undisturbed cores of all types of sediments from shallow as well as deep water is of paramount importance for the reconstruction of the history of the oceans and of climate changes, as well as for various technical purposes such as drilling site surveys and slope stability predictions. While considerable progress has been made, during the last years, in laboratory techniques for sediment analysis, relatively simple sampling devices still prevail, and samples collected so far usually represent surface-near layers only. This is especially true for deep waters, where core recovery from gravity corers seldom exceed 10 meters. Giant piston corers partially solve the problem of deep penetration, but they are difficult to control and not suitable for all types of sediments. During coring and core treatment typical physical and chemical parameters of the sediments may be lost. Therefore, a more precise characterization of the subsurface requires in-situ testing. The objective of the project is the design and development of a heavy-duty sediment corer. The system is designed to recover up to 30 m long sediment cores from water depths down to 5,000 m. It consists mainly of two units: a frame which is connected through an umbilical to the support vessel and a sledge which contains a hammer to drive the core barrel into the soil. The above configuration ensures that the sledge is decoupled from the ship's movements during coring. Penetration is supported by water flushing and a stationary piston. The system will also provide the possibility to perform measurements of in-situ geotechnical parameters of the seabed and for recovering pore water samples by replacing the lower most section of the core barrel by a testing probe. Source : cordis