Uticaj opadanja nivoa podzemnih voda na procese starenja vodozahvatnih objekata na primeru izvorišta Trnovče / Effects of groundwater level declining on well ageing processes at Trnovče water supply source
2012
Majkić-Dursun, Brankica (Institut za vodoprivredu Jaroslav Černi, Beograd (Srbija)) | Popović, Ljiljana (Geološki institut Srbije, Beograd (Srbija)) | Miolski, Dušan (JKP Vodovod, Smederevska Palanka (Srbija)) | Anđelković, Oliver (Institut za vodoprivredu Jaroslav Černi, Beograd (Srbija))
Groundwater exploatation from alluvial sediments is often accompanied with a number of problems related to the decrease in initial wells capacity. Declining of groundwater levels during exploitation, may cause changes in chemical and microbiological composition which directly impact well ageing process. Mixing of waters with differing hydrochemical conditions, the penetration of oxygen to the anoxic water carrying dissolved iron and manganese, affecting the appearance redox front inside the well. These cases lead to the rapid formation of mineral deposits on the well screens, as well speed up the aging process. The regional water supply source of Trnovče was developed to provide water supply to the cities of Smederevska Palanka and Velika Plana. The aggregate capacity of the 20 wells comprising the source is 100- 120 l/s. However, in 2010 and 2011 the capacity of the source was only 80-100 l/s because of a number of problems associated with well operation. In the 2010-2011 period, monitoring of groundwater level and chemical composition variations in the production wells and piezometers was intensified. Results show that there is a general groundwater level decline across the water supply source, with the lowering of both dynamic levels and even static levels (during hydrologically unfavorable periods) in the well screen zone. Key
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