SCOUR AROUND SUBMERGED PIPELINES IN ALTERNATING CURRENT

Seafloor erosion near submerged pipelines, caused by current and waves, is a well-known phenomenon. The scour pattern around a submerged pipeline and a sand bed was investigated to determine whether the effects of an alternating current were of the same magnitude as those of a unidirectional current. Results were obtained from tests in a 30 foot long flume involving three pipe diameter (60,110, and 220 millimeters) and three current speeds (0.25 meters per second (m/s), 0.35 m/s, and 0.50 m/s). Results indicate that alternating current acting on a pipeline causes an increase in erosion depth of 30% compared to depths affected by unidirectional currents.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/8259551292
• Supplemental Notes:
  • Also pub. as Selskapet for Industriell op Teknisk Forskning, Trondheim (Norway) rept. no. STF60-A88015.
• Corporate Authors:

  Norsk Hydroteknisk Lab

  Trondheim,   Norway 
• Authors:
  • Dahl, T E
  • Yanbao, L
• Publication Date: 1988-1-28

Media Info

• Pagination: 29 p.

Subject/Index Terms

• TRT Terms: Alternating current; Erosion; Pipelines; Scour; Underwater structures
• Old TRIS Terms: Submerged conditions
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Marine Transportation; Pipelines; Terminals and Facilities;

Filing Info

• Accession Number: 00477814
• Record Type: Publication
• Source Agency: National Technical Information Service
• ISBN: 82-595-5129-2
• Files: TRIS
• Created Date: Dec 31 1988 12:00AM