Detection of unexploded ordnance (UXO) using marine magnetic gradiometer data

Ahmed Salem; Toshio Hamada; Joseph Kiyoshi Asahina; Keisuke Ushijima

doi:10.1071/EG05097

ISSN: 0812-3985
E-ISSN: 1834-7533

Detection of unexploded ordnance (UXO) using marine magnetic gradiometer data
Authors Ahmed Salem^a, Toshio Hamada^b, Joseph Kiyoshi Asahina^c and Keisuke Ushijima^d
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^a Airborne Geophysics Department, Nuclear Materials Authority of Egypt, , Kattamiya Road, Maadi, , P.O. Box 530, , Cairo, , Egypt ^b Shinko Research Co., LTD ^c Kobe Steel, LTD ^d Earth Resources Engineering Department, Faculty of Engineering, Kyushu University
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 36, Issue 1, Mar 2005, p. 97 - 103
DOI: https://doi.org/10.1071/EG05097
- Received: 27 Jul 2004
- Accepted: 19 Nov 2004
- Published online: 01 Mar 2005

Abstract

Recent development of marine magnetic gradient systems, using arrays of sensors, has made it possible to survey large contaminated areas very quickly. However, underwater Unexploded Ordnances (UXO) can be moved by water currents. Because of this mobility, the cleanup process in such situations becomes dynamic rather than static. This implies that detection should occur in near real-time for successful remediation. Therefore, there is a need for a fast interpretation method to rapidly detect signatures of underwater objects in marine magnetic data.

In this paper, we present a fast method for location and characterization of underwater UXOs. The approach utilises gradient interpretation techniques (analytic signal and Euler methods) to locate the objects precisely. Then, using an iterative linear least-squares technique, we obtain the magnetization characteristics of the sources. The approach was applied to a theoretical marine magnetic anomaly, with random errors, over a known source. We demonstrate the practical utility of the method using marine magnetic gradient data from Japan.

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Article Type: Research Article

Keyword(s): analytic signal; detection; Euler; magnetic; magnetization; marine; underwater UXO

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Detection of unexploded ordnance (UXO) using marine magnetic gradiometer data

Abstract

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