MEASUREMENT OF ICEBERG DRAFT

Icebergs transported by the Labrador current from northern Baffin Sea are a great danger for oil wellheads and other equipment installed on the sea bottom on Labrador's continental shelf. They may ground and destroy oil equipment installed on the bottom, so the offshore oil industry requires statistical data about iceberg draft. The problem is to measure this parameter. There are three methods of iceberg draft estimation: (1) measuring the water depth with an echo sounder close to a grounded iceberg; (2) dragging a cable with a depth sensor between two ships passing on either side of the iceberg; (3) using a side scan sonar operating in a vertical mode. An attempt was also made to map the underside of Arctic sea ice using back scattered acoustical waves. The accuracy of these methods is very low. Therefore, an alternate method is proposed that uses a submersible for an in situ iceberg draft measurement. The system described provides a high precision method with a mean accuracy of about plus or minus 0.2 of a meter.

Media Info

  • Pagination: p. 265

Subject/Index Terms

Filing Info

  • Accession Number: 00325816
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 15 1981 12:00AM