Accession Number : ADA307307

Title :   A Mathematical Model for Mine Burial by Mobile Underwater Sand Dunes.

Descriptive Note : Technical rept.,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Mulhearn, P. J.

PDF Url : ADA307307

Report Date : JAN 1996

Pagination or Media Count : 28

Abstract : Buried mines in the approaches to major ports and in shipping choke points constitute a significant problem in mine countermeasures operations because they are so hard to detect. One of the burial mechanisms which would occur in some important locations is burial by mobile underwater sand dunes (also called sand waves). In this report a new mathematical model is presented for this process and it is shown that the factors which are most critical for the time taken for a mine to become buried are firstly current strength, secondly dune size and thirdly the initial location of a mine in relation to crests and troughs of a sand dune field. As current strength increases the time taken for a mine to become buried decreases sharply. On the other hand the time till burial increases as a dune's size increases, and as a mine's initial distance downstream from a dune's crest increases.

Descriptors :   *MINE COUNTERMEASURES, *UNDERWATER MINES, MATHEMATICAL MODELS, OCEAN WAVES, OCEAN CURRENTS, SHIP MOTION, NAVAL MINE WARFARE, SAND, CONTINENTAL SHELVES, TIDAL CURRENTS, FLOW FIELDS, SEASONAL VARIATIONS, BURIED OBJECTS, RANGE(DISTANCE), AUSTRALIA, SEDIMENTS, OCEAN BOTTOM, OCEAN TIDES, DUNES, SEDIMENTOLOGY.

Subject Categories : Undersea and Antisubmarine Warfare
      Underwater Ordnance
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE