Conceptualization and finite element groundwater flow modeling of a flooded underground mine reservoir in the Asturian Coal Basin, Spain

Andres Gonzalez Quiros (Corresponding Author), José Paulino Fernández-Álvarez

Research output: Contribution to journalArticle

Abstract

Secure workings in underground coal mines usually require the lowering of water levels via pumping. After mine closure, pump systems are stopped and the water level recovers in a process known as groundwater rebound. In the Asturian Coal Basin, Spain, the closure and flooding of underground coal mines carries associated environmental impacts that ought to be assessed. Among them, those related with groundwater flow and pollutant transport are of main interest. To evaluate the environmental risks during and after mine closure the construction of numerical flow models is suggested, which rely on an appropriate conceptualization of the mine-hydrogeological system. Underground mines of this region are characterized by very steep coal seams due to a folded and faulted geological structure. The resulting geometry translates into a complex network of hundreds of kilometers of mine tunnels and galleries. This is a challenge for the construction of numerical models in issues like geometrical problems, assignation of hydraulic parameters, coupling of physical laws and high computational cost. This paper presents the conceptual and numerical model of two linked mines of the region, Mosquitera and Pumarabule, that recently ended the flooding stage, to be used in assessment of post-closure environmental risks. To implement the geometry of the underground mine, a methodological approach to translate the mining information to the numerical simulator has been developed, that retains the hydraulic behavior of the key underground mine elements. A methodological approach for coupled simulation of mine conduits and porous media flow has been explicitly adapted. The results, in terms of the velocity distribution field inside the mine and possible outflow sites, are useful to provide a basis for later extension of transport models and assessment of hydro chemical impacts on the area.

Original languageEnglish
Article number124036
Number of pages10
JournalJournal of Hydrology
Volume578
Early online date12 Aug 2019
DOIs
Publication statusPublished - 1 Nov 2019

Fingerprint

flow modeling
groundwater flow
coal
basin
environmental risk
coal mine
water level
flooding
hydraulics
geometry
pollutant transport
geological structure
coal seam
simulator
porous medium
pumping
pump
environmental impact
outflow
tunnel

Keywords

  • mine closure
  • underground coal mining
  • Asturian coal basin
  • environmental risks
  • conceptual model
  • numerical modeling
  • Numerical modeling
  • Underground coal mining
  • Asturian Coal Basin
  • Mine closure
  • Conceptual model
  • Environmental risks

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

@article{f486002d635248b39c7e08fd10841e8f,
title = "Conceptualization and finite element groundwater flow modeling of a flooded underground mine reservoir in the Asturian Coal Basin, Spain",
abstract = "Secure workings in underground coal mines usually require the lowering of water levels via pumping. After mine closure, pump systems are stopped and the water level recovers in a process known as groundwater rebound. In the Asturian Coal Basin, Spain, the closure and flooding of underground coal mines carries associated environmental impacts that ought to be assessed. Among them, those related with groundwater flow and pollutant transport are of main interest. To evaluate the environmental risks during and after mine closure the construction of numerical flow models is suggested, which rely on an appropriate conceptualization of the mine-hydrogeological system. Underground mines of this region are characterized by very steep coal seams due to a folded and faulted geological structure. The resulting geometry translates into a complex network of hundreds of kilometers of mine tunnels and galleries. This is a challenge for the construction of numerical models in issues like geometrical problems, assignation of hydraulic parameters, coupling of physical laws and high computational cost. This paper presents the conceptual and numerical model of two linked mines of the region, Mosquitera and Pumarabule, that recently ended the flooding stage, to be used in assessment of post-closure environmental risks. To implement the geometry of the underground mine, a methodological approach to translate the mining information to the numerical simulator has been developed, that retains the hydraulic behavior of the key underground mine elements. A methodological approach for coupled simulation of mine conduits and porous media flow has been explicitly adapted. The results, in terms of the velocity distribution field inside the mine and possible outflow sites, are useful to provide a basis for later extension of transport models and assessment of hydro chemical impacts on the area.",
keywords = "mine closure, underground coal mining, Asturian coal basin, environmental risks, conceptual model, numerical modeling, Numerical modeling, Underground coal mining, Asturian Coal Basin, Mine closure, Conceptual model, Environmental risks",
author = "Quiros, {Andres Gonzalez} and Fern{\'a}ndez-{\'A}lvarez, {Jos{\'e} Paulino}",
note = "This work has been conducted as part of the MERIDA project (Management of Environmental Risks During and After mine closure) supported by the RFCS under Contract No. RFCR-CT-2015-00004. The authors thank the support of Alicja Krzemień (Central Mining Institute, Katowice, Poland), Ana Su{\'a}rez S{\'a}nchez and Pedro Riesgo Fern{\'a}ndez (University of Oviedo, Spain) and the Hulleras del Norte, S.A. (HUNOSA) coal mining company. We also gratefully acknowledge the suggestions and comments of Russell Adams, Christian Wolkersdorfer and Geoff Parkin in the review process.",
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AU - Quiros, Andres Gonzalez

AU - Fernández-Álvarez, José Paulino

N1 - This work has been conducted as part of the MERIDA project (Management of Environmental Risks During and After mine closure) supported by the RFCS under Contract No. RFCR-CT-2015-00004. The authors thank the support of Alicja Krzemień (Central Mining Institute, Katowice, Poland), Ana Suárez Sánchez and Pedro Riesgo Fernández (University of Oviedo, Spain) and the Hulleras del Norte, S.A. (HUNOSA) coal mining company. We also gratefully acknowledge the suggestions and comments of Russell Adams, Christian Wolkersdorfer and Geoff Parkin in the review process.

PY - 2019/11/1

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N2 - Secure workings in underground coal mines usually require the lowering of water levels via pumping. After mine closure, pump systems are stopped and the water level recovers in a process known as groundwater rebound. In the Asturian Coal Basin, Spain, the closure and flooding of underground coal mines carries associated environmental impacts that ought to be assessed. Among them, those related with groundwater flow and pollutant transport are of main interest. To evaluate the environmental risks during and after mine closure the construction of numerical flow models is suggested, which rely on an appropriate conceptualization of the mine-hydrogeological system. Underground mines of this region are characterized by very steep coal seams due to a folded and faulted geological structure. The resulting geometry translates into a complex network of hundreds of kilometers of mine tunnels and galleries. This is a challenge for the construction of numerical models in issues like geometrical problems, assignation of hydraulic parameters, coupling of physical laws and high computational cost. This paper presents the conceptual and numerical model of two linked mines of the region, Mosquitera and Pumarabule, that recently ended the flooding stage, to be used in assessment of post-closure environmental risks. To implement the geometry of the underground mine, a methodological approach to translate the mining information to the numerical simulator has been developed, that retains the hydraulic behavior of the key underground mine elements. A methodological approach for coupled simulation of mine conduits and porous media flow has been explicitly adapted. The results, in terms of the velocity distribution field inside the mine and possible outflow sites, are useful to provide a basis for later extension of transport models and assessment of hydro chemical impacts on the area.

AB - Secure workings in underground coal mines usually require the lowering of water levels via pumping. After mine closure, pump systems are stopped and the water level recovers in a process known as groundwater rebound. In the Asturian Coal Basin, Spain, the closure and flooding of underground coal mines carries associated environmental impacts that ought to be assessed. Among them, those related with groundwater flow and pollutant transport are of main interest. To evaluate the environmental risks during and after mine closure the construction of numerical flow models is suggested, which rely on an appropriate conceptualization of the mine-hydrogeological system. Underground mines of this region are characterized by very steep coal seams due to a folded and faulted geological structure. The resulting geometry translates into a complex network of hundreds of kilometers of mine tunnels and galleries. This is a challenge for the construction of numerical models in issues like geometrical problems, assignation of hydraulic parameters, coupling of physical laws and high computational cost. This paper presents the conceptual and numerical model of two linked mines of the region, Mosquitera and Pumarabule, that recently ended the flooding stage, to be used in assessment of post-closure environmental risks. To implement the geometry of the underground mine, a methodological approach to translate the mining information to the numerical simulator has been developed, that retains the hydraulic behavior of the key underground mine elements. A methodological approach for coupled simulation of mine conduits and porous media flow has been explicitly adapted. The results, in terms of the velocity distribution field inside the mine and possible outflow sites, are useful to provide a basis for later extension of transport models and assessment of hydro chemical impacts on the area.

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