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Using helicopter electromagnetic (HEM) surveys to identify potential hazards at coal-waste impoundments: Examples from West Virginia

Hammack, R and Kaminski, V and Harbert, W and Veloski, G and Lipinski, B (2010) Using helicopter electromagnetic (HEM) surveys to identify potential hazards at coal-waste impoundments: Examples from West Virginia. Geophysics, 75 (6). ISSN 0016-8033

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Abstract

We have used 14 multifrequency helicopter-borne electromagnetic (HEM) surveys to determine the internal structure and integrity of mine-impoundment structures in West Virginia, U.S.A. - the first time such technology has been applied in this way and apparently well suited for such activities. The HEM surveys identified areas of concern in each of the impoundments investigated. In most cases, these were areas where filtrate was emerging high on the downstream embankment and represented an erosion risk. Of greater concern, the HEM survey identified thick bodies of slurry that remained unconsolidated and were buried deep beneath the embankment's crest of some impoundments. Ground confirmation activities indicated that HEM survey interpretations provided an accurate representation of the conductivity distribution within coal-waste impoundments. We then interpreted the conductivity/depth images from the HEMsurveys to provide a snapshot of hydrologic conditions that existed within the impoundment at the time of the survey. Resistivity profiles were obtained at the inactive impoundment along segments of flight lines from the HEM survey. HEM and resistivity surveys detected a conductive layer at a depth of about 7 m that was interpreted to be unconsolidated coal slurry. The methods also detected conductive bodies at a depth of about 26 m that were interpreted to be flooded mine works. Resistivity surveys from these segments corroborated HEM data, thereby providing independent confirmation of the HEM data and its processing. The resistivity and HEM surveys indicated a resistive surface layer where the coarse coal refuse was placed. Beneath the resistive surface layer is a conductive layer of unconsolidated or partially consolidated coal slurry. These highly loaded bodies of unconsolidated slurry are susceptible to solifluction, which can threaten embankment stability. Underground mine workings were identified in the HEM data from one impoundment. © 2010 Society of Exploration Geophysicists.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Hammack, R
Kaminski, V
Harbert, Wharbert@pitt.eduHARBERT
Veloski, G
Lipinski, B
Date: 1 January 2010
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: Geophysics
Volume: 75
Number: 6
DOI or Unique Handle: 10.1190/1.3505764
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Geology and Planetary Science
Refereed: Yes
ISSN: 0016-8033
Date Deposited: 25 Aug 2012 14:13
Last Modified: 02 Feb 2019 15:57
URI: http://d-scholarship.pitt.edu/id/eprint/13724

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