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Modeling of the groundwater flow system in excavated areas of an abandoned mine

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Title: Modeling of the groundwater flow system in excavated areas of an abandoned mine
Authors: Tomiyama, Shingo Browse this author
Igarashi, Toshifumi Browse this author →KAKEN DB
Tabelin, Carlito Baltazar Browse this author
Tangviroon, Pawit Browse this author
Ii, Hiroyuki Browse this author
Keywords: Abandoned and closed mine
Acid mine drainage (AMD)
Numerical model
AMD reduction
Issue Date: Mar-2020
Publisher: Elsevier
Journal Title: Journal of contaminant hydrology
Volume: 230
Start Page: 103617
Publisher DOI: 10.1016/j.jconhyd.2020.103617
Abstract: This study evaluated the assumption that back-filled excavated areas of old mine workings can be modeled as porous media, where groundwater flow is governed by Darcy's law. The Yatani mine, located in Yamagata Prefecture, Japan, was selected for this study because several mining methods were used during its operation and detailed drawings of the excavated areas of the mine are available. The model was calibrated using combinations of hydraulic conductivities (k), with the best-matched case being selected by comparing calculated and measured AMD fluxes. Modeled AMD fluxes along the drainage tunnel (-2 L level) were consistent with measured data when the excavated areas were considered to be porous media with a specific hydraulic conductivity, and the presence of faults and permeability were taken into account. The model also successfully predicted the increasing trend of AMD flux from the shaft to adit mouth. In the numerical model, the back-filled excavated areas were assumed to behave as porous media, which was shown to be a valid assumption in this mine. The model demonstrated that back-filling the excavated areas and drainage tunnel with low permeability materials could reduce the flux of Zn in AMD by up to 61%.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 富山 眞吾

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