Accession Number : ADA187734

Title :   Sea Duct: A Deep-Sea Computer-Controlled Recirculating Flume for the Study of Sea Floor Stability.

Descriptive Note : Final rept.,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Personal Author(s) : Winget, Clifford L ; Nowell, Arthur R ; Terry, William E ; Gordon, Allan G

PDF Url : ADA187734

Report Date : Aug 1987

Pagination or Media Count : 220

Abstract : The Sea Duct Ocean-Bottom Laboratory is a computer controlled recirculating inverted flume for the in-situ study of sediment transport. It is designed to measure the sea floor response to controlled currents analogues to those generated by surface waves, tidal, or deep ocean storms. The external support frame is an equilateral triangle with sixteen foot sides. It is 12 feet high, has an air weight of 12,500 lbs., and 2800lb. submerged weight. Three lead-acid battery packs located at the vertex of the triangle legs provide power for the recirculating water pumps, hydraulic power, and ancillary equipment. The inner rotatable structure consists of a 4 foot long by 2 foot wide open bottom windowed test section that is 9 inches high. It is connected to 30 feet of 8 inch tube configured as an elongated toroid. Above the test section is a traverse carriage with stereo camera, flash, and a laser Doppler velocimeter to measure fluid stresses. Internal flow velocities are controlled and can be ramped up to approximately 2 ft/sec providing shear stress sufficient to scour sand, silts, and fine clays. Water and sediment sampling devices obtain specimens from inside and outside the test section. Keywords: Ocean currents; Oceanographic equipment; Sediment stress.

Descriptors :   *OCEAN BOTTOM, *OCEANOGRAPHIC EQUIPMENT, *SEDIMENT TRANSPORT, CLAY, COMPUTER APPLICATIONS, CONTROL, DEEP OCEANS, DOPPLER SYSTEMS, EXTERNAL, FLOW, FLUIDS, FRAMES, HYDRAULIC POWER, INTERNAL, LASER VELOCIMETERS, LEGS, OCEAN CURRENTS, RESPONSE, ROTATION, SAMPLERS, SAND, SEDIMENTS, SHEAR STRESSES, SILT, STABILITY, STEREOSCOPIC CAMERAS, STORMS, STRESSES, SURFACE WAVES, TEST EQUIPMENT, TRIANGLES, UNDERWATER, VELOCITY, SEA WATER, WEIGHT, RECIRCULATION, PUMPS, UNDERWATER EQUIPMENT

Subject Categories : Physical and Dynamic Oceanography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE