TY - JOUR T1 - Evaluation of Quality Changes in the Groundwater Resources and IRWQIGC Upstream of Zayandehrood Dam TT - بررسی روند تغییرات کیفیت منابع آب زیرزمینی و ارزیابی شاخص IRWQIGC در بالادست سد زاینده‌رود JF - JSTNAR JO - JSTNAR VL - 24 IS - 2 UR - http://jstnar.iut.ac.ir/article-1-3894-en.html Y1 - 2020 SP - 27 EP - 40 KW - Groundwater KW - IRWQIGC KW - Kriging KW - Zayandehrood N2 - Understanding the quality of groundwater resources, which are the largest available freshwater reservoir, is one of the needs in planning and developing water resources. The purpose of this research was to study the quality changes of groundwater resources in the upstream aquifers of Zayandehrood Dam (1995-2016) and to evaluate water quality in terms of drinking and agricultural consumption and evaluation of IRWQIGC. For this purpose, EC, TDS, SAR, PH, TH, Cl, CO3, Ca, Mg, Na, K, HCO3 and NO3 parameters and heavy elements including zinc, copper, lead, cadmium and arsenic were investigated from laboratory samples. In the upstream aquifers of the Zayandehrood Dam, the water classification was mainly agricultural in the C2-S1 range, and it was generally acceptable in the drinking classes. The amount of heavy elements was allowed. The average amount of nitrate in the Chehelkhaneh, Damanehdaran, Boein-Miandasht and Chadegan aquifers was calculated to be 43.77, 48.08, 35.53 and 26.36 mg / l, respectively, and the maximum nitrate levels in these areas, however, were often exceeded. Nitrate zoning and IRWQIGC were performed by the kriging method. The lowest index values, which fell into relatively poor classes, were in the south and southwestern parts of Boein-Miandasht and south and south-west of the Chehelkhaneh, and in the central parts of Damanehdaran, and the south of Chadegan. M3 10.47176/jwss.24.2.41431 ER -