بررسي تغييرات كيفي آب هاي زيرزميني دشت ارسنجان

Study of Groundwater Quality Variation in Arsanjan Plain

Optimum management of water resources in order to increase and preserve water quality requires sufficient data of the location, value as well as spatial distribution of the chemical factors. Water salinity and decrease of water quality are major concern for agricultural development plans especially in arid regions. This research was conducted in Arsanjan plain located in the northeast of Fars province to investigate the spatial variation of groundwater quality parameters such as EC, PH, NO3, TDS for agricultural and domestic drinking purposes. The results showed that EC and TDS have an increasing trend from northwest to the south and southeast of the plain while NO3 has increased from the south and southeast to the northwest. Also the research showed that the classification of the drinking water according to the Schoeller diagram is 17% as "Good", 48.22% as "acceptable", 31.71 as "unsuitable" and 3.07 as "bad". Meanwhile the quality classes for agriculture were as follow: Good (14.5%), acceptable (66.14%), (15.71%) and bad (3.65%). The results also showed revealed that more than 75% of groundwater resources of Arsanjan plain have low to moderate class of limitation for agriculture.