Publication Date:
2022-05-26
Description:
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 analogous 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 a 2800 lb. 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. This report consists of three sections. The first subdivision
discusses the electro-mechanical systems and deployment-
recovery techniques, while the second portion
covers the microprocessor controller and its support
equipment. The third section contains the appendices, which
consists of program listings, schematics, system and deployment
check-list, etc.
Description:
Office of Naval Research, Environmental Sciences Directorate, under Contracts N00014-85-C-0001 and N00014-87-K-007
Keywords:
Marine sediments
;
Sediment transport
;
Ocean bottom
;
Ocean currents
;
Data processing
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
Format:
application/pdf
