Munitions Response Projects Shallow Water Marine UXO Detection Survey - Underwater Survey of Camp Lejeune
Abstract
An Underwater UXO Towed Array (UUTA) electromagnetic system designed by 3Dgeophysics (3Dg) was demonstrated from May 17 to July 6, 2010 at the United States Marine Corps Base Camp Lejeune (Camp Lejeune), North Carolina. The objective of the work was to demonstrate, in dynamic marine conditions, highly accurate horizontal and vertical (height above sea floor) position control for UXO detection and mapping. The demonstration was led by AMEC Earth & Environmental, Inc. (AMEC) and performed by 3Dg and Ordnance and Explosives Remediation, Inc. (OER) for the United States Department of Defense, Environmental Security Technology Certification Program (ESTCP). The 180-acre survey area was located adjacent to Camp Lejeune s BT-3/N-1 impact area, a former bombing and artillery range near Browns Island, a public recreational, boating and fishing area. The UUTA was designed to improve detection and location accuracy over former underwater UXO mapping technologies. Achieving accurate position control is difficult for many technologies that employ flexible tethers to tow sensor fish or bottom dragging sleds. The UUTA system utilizes modified and improved Geonics, Ltd. EM61 metal detection technology. The UUTA system includes a 2.0 meter (m) wide (2 receiver coil) non-contact bottom-skimming sensor platform, a down rigging tow bar, and a hydrofoil control surface mounted on a 6.7 m ThunderJet boat. The survey area, exposed to the open Atlantic Ocean, was subject to rapidly changing weather patterns, rip currents, offshore winds, and wave action in addition to tidal variations. UXO Divers from OER utilized innovative techniques to reacquire targets identified by the digital geophysical mapping and surrogate seed items on an underwater instrument verification strip (IVS). A total of 97 acres were surveyed during the demonstration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2011
- Accession Number
- ADA600403
Entities
People
- Andri Hanson
- Brian Herridge
- David Lynch
- Donna Sharp
- Erik Kitt
- Hugh Sease
- Jeremy Haney
- Paula Bond
- Raye Lahti
- Thomas Ligon