Алексєєнко О. А.

Purpose. Spatial analysis of ground water pollution for Kotovskiy district of Odessa region in 2015. Methods. Photometric, gauge, geographic information systems. Results. There are digital maps which show distribution of ground water pollution for Kotovsiy district. There are determined: maximum permissible concentration by oxidation in groundwater and artesian waters in nitrates were observed. The concentration of nitrates in groundwater varies between 2 – 4.9 MPC on over meadow territory and 25% of the territory – 7 MPC. Conclusions. The highest nitrate pollution of groundwater is typical for the eastern part of the Kotovsky district. It is proposed to reduce the amount of nitrate fertilizers, taking into account the vulnerability of groundwater to nitrate nitrogen based on the zoning of the level of contamination of the Kotovsky district of Odessa region.

Approximation of temporal variability of water quality indexes was analyzed by various distribution func-tions (normal, lognormal, Weibull and exponential) for Dnestr river Beliaevka city. Approximation density in-dexes were calculated. Optimal distribution function of water quality indexes was determined.