The Hybrid Finite Element Mixing Cell Method: A New Flexible Method for Modelling Mine Ground Water Problems |
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Authors: | Serge Brouyère Ph Orban S Wildemeersch J Couturier N Gardin A Dassargues |
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Affiliation: | 1.Hydrogeology and Environmental Geology, GEO3, ArGEnCo, Aquap?le,University of Liège,Liège,Belgium;2.F.R.I.A., F.R.S.-FNRS,Brussels,Belgium |
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Abstract: | Dewatering operations often stop at mine closure. The ground water rebound can have undesirable consequences, which numerical
models can help one understand and manage. However, classical modelling techniques are relatively unsuitable to these contexts.
While spatially distributed and physically based models suffer difficulties due to the lack of data and the complexity of
geological and hydrogeological conditions, black-box models are too simple to deal with the problems effectively. A new modelling
method is proposed to simulate ground water environments in which water flows through mined (exploited) and unmined (unexploited)
areas. Exploited zones are simulated using a group of mixing cells possibly interconnected by pipes. Unexploited zones are
simultaneously simulated using classical finite elements. This combined approach allows explicit calculation of ground water
flows around the mine and mean water levels in the exploited zones. Water exchanges between exploited zones and unexploited
zones are simulated in the model using specifically defined internal boundary conditions. The method is tested on synthetic
cases of increasing complexity, and first results from a real case study are presented. |
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Keywords: | Ground water flow model Ground water rebound HFEMC method Mining works SUFT3D |
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