application of geostatistical methods for mapping groundwater phosphate construction in eyvan plain, ilam province, iran

The purpose of this study was to evaluate the spatial changes of groundwater phosphate concentrations using geostatistical methods based on data from 10 groundwater wells. one of the conventional tools in decision making on the groundwater management is geostatistical method. to evaluate the spatial changes of phosphate concentrations in groundwater, the universal kriging method with crossvalidation was used for mapping and estimating groundwater phosphate concentrations in eyvan plain, iran. phosphate concentration followed a lognormal distribution and demonstrated a moderate spatial dependence according to the nugget ratio (60%). the experimental variogram of groundwater phosphate concentration was bestfitted by a spherical model. crossvalidation errors were within an acceptable level. according to the spatial distribution map, phosphate pollution in the groundwater occurred mostly in the west of the plain because of the phosphate discharge from the industrial effluents.