Accession Number : AD0777046
Title : Trenching on Shore and In the Ocean in Arctic Regions: State-of-the-Art Survey.
Descriptive Note : Technical note,
Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
Personal Author(s) : Hironaka,M. C.
Report Date : MAR 1974
Pagination or Media Count : 54
Abstract : The objective of this study was to identify present techniques, procedures, and equipment that could be used for developing trenches for cables and pipelines in sea-to-shore installations in arctic regions. In pursuing this objective, a literature search was performed. The results of that effort are reported herein. Factors influencing polar trenching operations include: (1) materials to be trenched, (2) properties of permafrost and frozen ground, (3) depth to permafrost or frozen ground, (4) seafloor ice scoring, (5) oceanographic factors, and (6) seasonal effects. For sea-to-shore cable and pipeline installations, present trenching methods have some limitations; thus, it is recommended that a trenching device capable of operating on land, through the surf zone, and in deep water be developed to trench through all material including rock and which uses high pressure water jetting, normal water jetting, and suction dredging techniques. (Modified author abstract)
Descriptors : *Trenching, *Arctic regions, *State of the art, Underground, Underwater, Cables, Pipelines
Subject Categories : Civil Engineering
Distribution Statement : APPROVED FOR PUBLIC RELEASE