On the use of electrical resistivity methods in monitoring infiltration of salt fluxes in dry coal ash dumps in Mpumalanga, South Africa

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dc.contributor.authorMuchingami, Innocent
dc.contributor.authorNel, Jacobus
dc.contributor.authorXu, Yongxin
dc.contributor.authorSteyl, Gideon
dc.contributor.authorReynolds, Kelley
dc.date.accessioned2013-10-13T21:01:45Z
dc.date.available2013-10-13T21:01:45Z
dc.date.issued2013
dc.description.abstractOne of the principal environmental concerns relating to coal combustion waste disposal is the potential for groundwater contamination from salt fluxes and trace elements that may be leached into the underlying groundwater system. Since changes in moisture and salt concentrations usually provide contrasts in electrical properties against the host media, electri - cal resistivity methods can be used to monitor ingression of solute plumes as well as to detect any preferential flow paths within the ash medium. In this study, 2D electrical resistivity tomography was used to monitor brine (10% NaCl) water ingression through the unsaturated zone of a dry coal ash dump at a power station, Mpumalanga, South Africa. This was after the initial laboratory determination of the relation between electrical resistivity and moisture/salt content for the ash dump. The results showed that infiltration plume progression was more pronounced in the vertical direction, suggesting that moisture movement is mainly due to gravitational pull. There was no evidence of preferential flow within the ash medium, although the different infiltration rates for different sites suggested different permeability within the unsaturated zone.en_US
dc.description.accreditationDepartment of HE and Training approved listen_US
dc.identifier.citationMuchingami, I., et al. (2013). Application of the rainfall infiltration breakthrough (RIB) model for groundwater recharge estimation in west coastal South Africa. Water SA, 39(2): 491-498en_US
dc.identifier.issn0378-4738
dc.identifier.urihttp://hdl.handle.net/10566/754
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherWater Research Commissionen_US
dc.rightsCopyright Water Research Commission. This file may be freely used for educational purposes, as long as it is not altered in any way. Acknowledgement of the authors and the source is required.
dc.status.ispeerreviewedtrue
dc.subjectCoal ash dumpsen_US
dc.subjectBrine infiltrationen_US
dc.subjectCementation factoren_US
dc.subjectElectrical resistivity tomographyen_US
dc.subjectTime lapse surveyen_US
dc.titleOn the use of electrical resistivity methods in monitoring infiltration of salt fluxes in dry coal ash dumps in Mpumalanga, South Africaen_US
dc.typeArticleen_US

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