Browsing by Author "Stachowicz, Zbigniew"

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Access status: Open Access ,
Ocena wpływu odwadniania przyszłej odkrywki »Piaski« KWB »Konin« SA na środowisko wodne
(2007) Stachowicz, Zbigniew; Szczepiński, Jacek
Overburden stripping in the »Piaski« open-pit is planned in 2010 and the lignite production will start one year later. Production capacity will be 3.5 Mg/year. According to the present conception lignite production will finish in 2036. Identified and documented geology structure, hydrogeological conditions and technology of operation, enable to apply as a fundamental water wells dewatering system. Taking into account hydrogeological conditions, three hydrostratigraphic units were distinguished in the area of potential impact of dewatering: overburden aquifer, lignite underlying aquifer and cretaceous aquifer. To simulate dewatering impact on water environment the USGS program MODFLOW has been used. Based on the two-layered numerical model with area of 1550 $km^{2}$, groundwater circulation was simulated in the natural conditions as well as in the conditions changed due to mine dewatering operations. The results indicate that because of mine dewatering the range of the cone of depression will amount to 3-5 km. Groundwater recharge originate mainly from the infiltration of precipitation and additionally from Czarna Struga river. Open pit dewatering may results in decrease of baseflow to Warta river by about 1.9 $m^{3}$/min.
Access status: Open Access ,
Wpływ głębokiej eksploatacji węgla brunatnego na zmiany środowiska wodnego w rejonie Kopalni »Bełchatów«
(2007) Motyka, Jacek; Czop, Mariusz; Jończyk, Waldemar; Stachowicz, Zbigniew; Jończyk, Ilona; Martyniak, Renata
Brown coal exploration in the Bełchtów open-pit is connected with intensive and deep drainage of the groundwater from Quaternary, Tertiary and also Cretaceous-Jurassic aquifers. Drainage of the high permeable aquifers has led to the formation of the extensive zone of the hydrodynamical changes of water environment. Bełchatów open-pit cone of depression has an a area of about 450 $km^{2}$. Within central part of this cone in the vicinity of the Bełchatów open-pit, groundwater table was highly lowered, on the order of tens metres. The next influence of the mining activity in Bełchatów open-pit is connected with changes in surface water budget, mainly in decreasing in groundwater recharge of the cachtments. Drainage of the groundwater is a reason for formation of the anthropogenic, modern vadose zone with availability of the oxygen. Groundwater quality deterioration within cone of depression is connected with geochemical processes of the sulphide minerals oxidation, buffering of the acid mine drainage and formation of the highly soluble secondary sulphate minerals and also occurrence of the Na-CI groundwater in the »Dębina« salt dome area. Monitoring system of the water environment in the vicinity of Bełchatów open-pit gave the possibility for observation of the water environment and also for planning of the remediation scenarios.