Advanced UXO Detection/Discrimination Technology Demonstration - Kaho'olawe Hawaii

Cargile, Diane M.; Bennett, Hollis H.; Goodson, Ricky A.; DeMoss, Tere A.; Cespedes, Ernesto R.

doi:10.21236/ada422173

Cited by 6 publications

(7 citation statements)

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“…Geophysical data were collected on the island of Kaho'olawe, Hawaii as part of an Environmental Security Technology Certification Program (ESTCP) project to determine the effectiveness of EMI sensors fielded in areas with a large background geologic response (Cargile et al, 2004). Ordnance and ordnance related scrap were emplaced in a number of test plots.…”

Section: Processing Of Data Collected On Kaho'olawe Island Hawaiimentioning

confidence: 99%

Improving UXO Detection and Discrimination in Magnetic Environments

Li¹,

Krahenbuhl²,

Meglich³

et al. 2010

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. for improved modeling of geophysical data in these environments. Lastly, through our field work we have discovered that sites previously thought to be benign may exhibit weak viscous remanent magnetization. Thus the field activities from this project have broad implications for ongoing and future remediation efforts in similar environments within the continental US. 3On another research front, we have utilized the information gathered from our field and laboratories activities to develop robust forward modeling algorithms and material on filter analysis of TDEM data in the presence of magnetic geologic noise. For example, we present a method for simulating the background response of strong magnetic environments on EM data using correlated random numbers. We show how these simulated responses may prove viable for discrimination of UXO in these magnetic terrains.Finally, we demonstrate new sets of procedures for improved target detection and decreased false positives in strongly magnetic environments based on the magnetic method. This includes development and implementation of iterative Wiener and wavelet based filter approaches for separating the response of magnetic geology from those of UXO. In addition, we demonstrate successful implementation of a high-pass Butterworth filter originally applied during decorrugation of unleveled magnetic data for the same purpose.4

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Section: Processing Of Data Collected On Kaho'olawe Island Hawaiimentioning

confidence: 99%

Improving UXO Detection and Discrimination in Magnetic Environments

Li¹,

Krahenbuhl²,

Meglich³

et al. 2010

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“…Remediation efforts conducted on the Island of Kaho'olawe, Hawaii, encountered VRM in the soils when EMI and magnetic geophysical methods were employed to aid in the detection of UXO. Cargile et al (2004) reports that 61,261 anomalies were dug at the Kaho'olawe site, where approximately 70% of the anomalies were caused by non-hazardous metal objects and 27% were caused by geology. This high percentage of geological anomalies illustrates the importance of developing an understanding of the influence of magnetic soils on EMI data in UXO detection.…”

Section: Introductionmentioning

confidence: 99%

Characterization of frequency‐dependent magnetic susceptibility in UXO electromagnetic geophysics

Meglich

Pasion

et al. 2008

SEG Technical Program Expanded Abstracts 2008

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Soils at many locations that have their origin in volcanic parent material and have undergone extensive weathering often exhibit strong frequency-dependent magnetic susceptibilities. The presence of such susceptibility has a profound effect on electromagnetic induction data acquired in such environments. Their transient electromagnetic response is characterized by a t-1 decay that is strong enough to mask UXO responses. In a field study and associated laboratory work on characterizing the frequencydependent magnetic susceptibility and its influence on transient electromagnetic data, we collected soil samples on the surface and in soil pits from the Island of Kaho'olawe, Hawaii, and measured their frequency dependent magnetic susceptibilities. We present the details of the field investigation, confirm previous theoretical work with field and laboratory measurements, characterize the susceptibility with a Cole-Cole model, and investigate the response specific to the measured susceptibility.

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“…During the Kaho'olawe cleanup operations the UXO contractor conducted "'EM and Flag' surveys using the EM-61 and the TM-5 EMU in a real-time detection/discrimination mode" (Cargile et al, 2004). During surveying, they "detected 61,261 subsurface anomalies and, after digging, they have found that only 2.7 percent are UXO, 27 percent are false positives from geologic sources, and 70.3 percent are the result of buried metal from both UXO and non-UXO related materials" (Cargile et al, 2004). It would seem that a significant reduction in digging clutter could be achieved through the use of digital geophysics and discrimination.…”

Section: Introductionmentioning

confidence: 99%

Examples of the Effect of Magnetic Soil Environments on Time Domain Electromagnetic Data

Walker¹,

Pasion²,

Billings³

et al. 2005

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2005

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During September 2004 a field study was carried out on the Hawaiian Island of Kaho'olawe to explore various aspects of the effect of magnetic soils on time domain electromagnetic (TEM) measurements. This field work was in support of two Strategic Environmental Research and Development Program funded research projects (UX1355 and UX1414) whose goals are to investigate the source and spatial variability of magnetic soil anomalies, to create a methodology for modelling the response of magnetic soils, and to develop TEM data collection techniques that can better discriminate between the response of magnetic soils and unexploded ordnance (UXO). Detailed electromagnetic surveys were carried out at a test site on the island. The data from the surveys verify the commonly held belief that magnetic variations in the soil can complicate the identification of UXO. However, the data also show that short wavelength variations in the TEM response due to micro-topographic variations and coil orientation effects can generate responses that could mask a UXO and/or result in a false positive. An overview of the surveys, a discussion of preliminary results and some practical recommendations for surveying in magnetic soil environments will be presented.

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Advanced UXO Detection/Discrimination Technology Demonstration - Kaho'olawe Hawaii

Cited by 6 publications

References 0 publications

Improving UXO Detection and Discrimination in Magnetic Environments

Improving UXO Detection and Discrimination in Magnetic Environments

Characterization of frequency‐dependent magnetic susceptibility in UXO electromagnetic geophysics

Examples of the Effect of Magnetic Soil Environments on Time Domain Electromagnetic Data

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