PROGNOZA ZASIĘGU LEJA DEPRESJI DLA ODKRYWKI WĘGLA BRUNATNEGO MĄKOSZYN-GROCHOWISKA KWB „KONIN” S.A.

Jacek Szczepiński, Renata Straburzyńska-Janiszewska

Abstract


PREDICTION OF THE DEPRESSION CONE RANGE FOR LIGNITE OPEN PIT MĄKOSZYN-GROCHOWISKA KWB „KONIN” S.A.

Abstract. To assess the development of the cone of depression and the groundwater inflow to the proposed opencast lignite mine Mąkoszyn-Grochowiska KWB„Konin“, 3-D, five-layered mathematical model with area of 1293 km2 has been constructed. The model identified groundwater flow under quasi-natural condition (2008), immediately before starting the dewatering of the deposit (2021) and during the dewatering (2029, 2034, 2039, 2044) The results indicate that groundwater inflow into the proposed open pit mine will be from about 40 to 60m3/min. The cone of depression will develop in all directions, covering Notec River and its tributaries as well as nearby lakes. The total area covered by the upper Quaternary series of aquifers will reach 130 km2, and by the Neogene-Paleogene-Mesozoic series of aquifers 390 km2. As a result of the groundwater table lowering the effective infiltration will rise from 1.83 dm3/s·km2 (for the whole studied area) to maximum 4.14 dm3/s·km2 in the cone of depression (2029). The average infiltration ratio in the Mąkoszyn-Grochowiska cone of depression will account for 3.18 dm3/s·km2 and will reach 18.6% of the average precipitation ratio.


Keywords


złoże węgla brunatnego, model matematyczny, wody podziemne.

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