بررسی تغییرات فصلی و سالانه کیفیت آب زیرزمینی حوزه آبخیز ارنان- دهج

Today, the inhabitants of the earth will experience significant changes in the quality of water due to the growth of the population and the increase of industrial centres. Due to the excessive extraction of groundwater resources on humans and ecosystems, human societies face unprecedented challenges. Therefore, the present study was carried out to investigate seasonal and annual changes in the quality of underground water in Arnan-Dahij watershed. For this purpose, the quality of ground water was evaluated through physicochemical parameters during the statistical period of 17 years (2002-2018). Seasonal changes of groundwater quality parameters showed that the average cation and anion concentrations were lowest in spring and highest in autumn. Also, the annual changes of the parameters showed that the lowest water quality parameters were related to the water year 2004-2005 and the highest quality parameters of the underground water were related to the water year 2018-2019. Among the cations, Na and Ca had the highest concentrations of 27.25 and 9.56 meq/l in the autumn season, and Cl and So4 had the highest concentrations of 18.22 and 14.3 meq/l in the autumn season, respectively. K and Co3 have the lowest amounts of cation and anion, respectively.