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Changes in water quality of zagreb water-pumping sites

Zelenika M., Soldo B., Durin B.

Archives of Environmental Protection

2009

Vol. 35, no. 4

145-158

The paper deals with changes of water quality of the aquifer in the valley of the Sava River at Zagreb, capital of Croatia, with respect to the depth of aquifer, laterally and temporally, during several years. The impact of water quality on the appearance of incrustation and corrosion in wells has also been analyzed. There are also presented procedures for preventing incrustation and corrosion. The basis for this paper are the results of analyses of the water samples taken from different wells, new piezometers and those previously carried out at water-pumping sites of different embedding depths.

Probabilistic evaluation of the extent of the unconfined aquifer

Kachnic M., Sadurski A.

Przegląd Geologiczny

2005

Vol. 53, nr 10/2

930-934

The research mainly aimed to present a novel application of the technique based on the Dempster-Shafer theory for the determination of the aquifer extent in a nonparametric (probabilistic) scale. Data analyses were carried out in the Geographic Information System. All the data were imported to the IDRISI 32 release 2. The Dempster-Shafer probability theory supported by the module BELIEF of IDRISI software was applied to the algebra of pixel maps. The research area covers 1300 km^2 in the eastern part of the Pomeranian Lakeland. The geology of this area is dominated by Pleistocene postglacial sediments. The study area comprises unconfined aquifers and four main confined aquifers. Only the unconfined aquifers were taken into account in the study described in these paper. The resulting image showed a map of the aquifers’ extents in a probabilistic scale, i.e., in a range between 0 (lack of the aquifer confirmed by field research) and 1 (occurrence of the aquifer, also proved by research).