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Browsing by Subject "flow modeling"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Model przepływu wód podziemnych dla zwałowiska nadkładu z odkrywkowej kopalni węgla brunatnego
    (2008) Wiencław, Edward; Marek, Zbigniew; Kaczarewski, Tadeusz; Koda, Eugeniusz
    The paper presents the example of numerical modelling of groundwater flow during dewatering of excavation in the lignite open pit mine. Sufficient cubic capacity for overburden soils is necessary to continue operation of the lignite mine in Turów site. The FEMWATER model of the overburden bank from the lignite open pit mine consists computer solution of groundwater flow for the design of the overburden heap in this site. The basis of numerical solution was the problem of groundwater flow described by Richard's equation, using 3-D finite elements method. The main, sophisticated purpose of the modelling carried out, taking into consideration this model, was the prediction of underflooding of the overburden bank and its surroundings. Modelling test results of the groundwater flow will be applied for extension of dewatering system and the design of monitoring system of potential threat of the overburden bank stability, constructed in the close vicinity of protected objects. The main objects which need special protection during overburden bank construction and dewatering are: the bank of Nysa Łużycka River, international road and industrial infrastructure around TURÓW lignite open mine. The modelling results also will be applied in designing of adequate technical safety solutions to protect these objects.
  • thumbnail.journal.alt
    Item type:Article, 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.