spatial distribution of nitrate contamination in groundwater using geostatistic in fars province (case study: siakh darengoun area)

spatial and temporal distribution of qualitative factors of groundwaters is important to preserve their quality. so, one of the advanced techniques for distribution of groundwater’s qualitative is geostatistic methods. in this study, 33 active wells were randomly sampled to determine the spatial distribution of nitrate pollution in groundwater of the siakh darengoun region (west of shiraz in fars province). according to the results, nitrate concentration in the studied region is between 3.85 to 14.92 mg/l. three methods such as kriging, inverse distance weighting and cokriging were used for studying nitrate spatial changes. furthermore, kriging indicator was used to produce the map of nitrate pollution probability. the maps can be used as an efficient tool for management decisions.