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NUMERICAL SIMULATIONS OF LONG TERM UNSATURATED FLOW AND ACID MINE DRAINAGE AT WASTE ROCK PILES
 

Summary: NUMERICAL SIMULATIONS OF LONG TERM UNSATURATED FLOW
AND ACID MINE DRAINAGE AT WASTE ROCK PILES
Omar Fala2
, John Molson2*
, Michel Aubertin2
, Bruno Bussière3
, Robert P. Chapuis2
Abstract. The authors present a numerical modeling study of unsaturated water
flow and acid mine drainage in idealized (but representative) waste rock piles and
using observed climatic recharge data. The simulations were used to help
understand the long term hydrogeological behaviour and to help design and
assess in situ groundwater monitoring methods. The flow simulations showed that
when the same annual cycles of average monthly recharge are applied each year
at the top of the piles, the water content profiles become periodic after a few
years. The water distribution within the piles then becomes independent of the
preceding hydraulic conditions for the cases considered here. Also, the results
indicate that the amplitude of water content variations inside the pile between
humid and relatively dry seasons is generally small (a few percent).
Consequently, typical measurements of the water content variations can, in some
cases, be limited for in situ monitoring because their level of precision is often of

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies