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Understanding Multi-Peak Anomalies for Unexploded Ordnance Discrimination Kushnir, Alexandra R. L.

Abstract

A workflow for the discrimination of multi-peak anomalies due to an unexploded ordnance (UXO) is presented. The effects of changes in the depth and orientation of a subsurface target on its TEM response are explored. Further, the variation of the peak separation, peak widths, maxima to minimum ratios and maxima values through time are modelled. Models of spatial and temporal variations are performed for both one and twotargets. These models are devoid of noise and focus primarily on the 3lb FLBGR bomb. It is found that the decay of the magnitudes of the anomaly maxima are related to the decay of the characteristic polarization curves of the UXO that creates them. The behaviour of the decay of the magnitudes of the maxima values of multi-peak anomalies is determined to be a good indication of target number in the subsurface. Observing these decays, it is possible to distinguish between two multi-peak scenarios, namely: a) a multipeak anomaly produced by a single UXO or two UXOs of the same type; and b) a multipeak anomaly produced by two UXOs of different types.

Item Metadata

Title
Understanding Multi-Peak Anomalies for Unexploded Ordnance Discrimination
Creator
Kushnir, Alexandra R. L.
Date Issued
2008-07-23
Description
A workflow for the discrimination of multi-peak anomalies due to an unexploded ordnance (UXO) is presented. The effects of changes in the depth and orientation of a subsurface target on its TEM response are explored. Further, the variation of the peak separation, peak widths, maxima to minimum ratios and maxima values through time are modelled. Models of spatial and temporal variations are performed for both one and twotargets. These models are devoid of noise and focus primarily on the 3lb FLBGR bomb. It is found that the decay of the magnitudes of the anomaly maxima are related to the decay of the characteristic polarization curves of the UXO that creates them. The behaviour of the decay of the magnitudes of the maxima values of multi-peak anomalies is determined to be a good indication of target number in the subsurface. Observing these decays, it is possible to distinguish between two multi-peak scenarios, namely: a) a multipeak anomaly produced by a single UXO or two UXOs of the same type; and b) a multipeak anomaly produced by two UXOs of different types.
Extent
8760412 bytes
Subject
UXO; multi-peak anomalies; Time-domain electromagnetic; TEM; two dipole approximation; polarization; depth; orientation
Genre
Graduating Project
Type
Text
File Format
application/pdf
Language
eng
Series
University of British Columbia. EOSC 449
Date Available
2008-07-23
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0053577
URI
http://hdl.handle.net/2429/1113
Affiliation
Science, Faculty of; Earth and Ocean Sciences, Department of
Campus
UBCV
Citation
Kushnir, Alexandra R.L. 2008. Understanding Multi-Peak Anomalies for Unexploded Ordnance Discrimination. Undergraduate Honours Thesis. Department of Earth and Ocean Sciences. University of British Columbia.
Peer Review Status
Unreviewed
Scholarly Level
Undergraduate
Copyright Holder
Kushnir, Alexandra R. L.
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
Aggregated Source Repository
DSpace

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Attribution-NonCommercial-NoDerivatives 4.0 International