Accession Number:

ADA551906

Title:

Wide Area Assessment (WAA) for Marine Munitions and Explosives of Concern

Descriptive Note:

Final rept. May 2008-Jun 2011

Corporate Author:

TETRA TECH EC INC BOTHELL WA

Report Date:

2011-08-01

Pagination or Media Count:

178.0

Abstract:

The objective of this demonstration was to address the lack of effective and proven approaches for conducting wide area assessment WAA of sites potentially containing underwater MEC. The WAA demonstration was performed at the South Beach Site off the south coast of Marthas Vineyard, MA. Tetra Tech developed and implemented an approach that utilizes multiple customized geophysical detection and mapping technologies and processing methods. These systems and methods include the use of multibeam, sidescan, and subbottom profiling sonars and a gradiometer array. The towfish platform used for collection of magnetometer data was the Marine Gradiometer Array MGA, a custom designed seven sensor 4m wide true 3-D gradiometer, utilizing Overhauser magnetometers. The Overhauser sensor has been demonstrated to be effective for the location of MEC in marine and freshwater environments. The MGA, depth rated to 300m, successfully operated in 1-35m water depth while exceeding survey production rate estimates. Field survey costs were demonstrated to be as low as 2450 per hectare inclusive of all four geophysical data sets.

Subject Categories:

  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE