Evaluation of groundwater quality of Rokh plain (Torbat-e Heydariyeh) using geostatistic methods

Rokh is a large plain which is located at north east of central desert of Iran. Its climate is semi-arid to arid. Inefficient management, irregular exploitation from underground resources, decreasing of raining which is resulted in decreasing water resources, are considered of concern factors from the viewpoint of quality changes in aquifer of  Rokh plain.Using quality data and multi-variant statistical methods (Factor Analysis & Cluster Analysis) quality situation of Rokh plain was analyzed. Concerning the result of factor Analysis, three factors as the most effective factors control 87% of chemical composition of ground water. Geology is the most important factor in quality changes of groundwater in area. Cluster Analysis of variants shows a great similarity in the amount of sodium and chloride ions. In Cluster Analysis of area quality data, Javadyeh area data is always located in different Cluster and has less similarity with other resources, concerning chemical composition.