Une méthode de modélisation hydrogéologique inverse appliquée à un problème d’ingénierie : l’abaissement du niveau d’un réservoir minier ennoyé dans le bassin ferrifère lorrain

Modelling the evolution of water quality in abandoned mines of the Lorraine Iron Basin

“…This water had to be pumped out so that mining could continue. Vaute et al (2004) estimated that during the final years of mining activity, in addition to natural gravity drainage, between 150 and 250 million m 3 of water was pumped annually in the entire basin. The mines in the South Basin were closed in 1995 and dewatering was progressively stopped.…”

“…Leaks have also been observed in the alluvial plain on the east bank of the Orne River, below the level of the Moyeuvre tunnel overflow. The leakage discharge, which has the effect of delaying the onset of overflow, has been estimated at 0.6 m 3 /s (Vaute et al, 2004;Fig. 7b).…”

“…The recharge rate and the total volume of water in the South Basin were taken from Vaute et al (2004), who estimated the volume of water in the South Basin reservoir at 230 million m 3 when it overflowed through the Moyeuvre tunnel (altitude = 172.5 m above NGF datum; Fig. 4).…”

“…More global approaches that have been proposed to overcome this problem include the semi-spatially distributed Groundwater Rebound in Abandoned Mineworkings (GRAM) model (Burke and Younger, 2000) and inverse models using timeseries and signal-processing methods (Burbey et al, 2000;Collon et al, 2002a;Vaute et al, 2004). These can be used to predict the discharge associated with flooded mines.…”

“…(a) Estimated recharge of and measured dewatering pumping rate in the mine reservoir (b) Fixed outflow rates: river regulation, leakage, drinking water supply (fromVaute et al, 2004).…”