ارزیابی و پهنه بندی کیفیت منابع آب زیرزمینی حوزه آبریز سفیدرود

In this study, with the aim of revealing the chemical quality of underground waters within the Sefidrud watershed for industrial purposes and also investigating the changes during three statistical periods (2001-2018), electrical conductivity variables, total dissolved solids, absorption ratio of sodium, bicarbonate, carbonate, chlorine, Sulfate, calcium, magnesium, sodium, potassium were collected from the watershed. In order to achieve these goals, the information of 360 sources of exploitation was used on an annual scale related to the statistical period of 18 years. Based on the available information, in order to zone the quality of water use with the Langelier index, the distribution of variables affecting the quality of industrial use was done using Geographical Information System (GIS) and geostatistical interpolation method for the studied area. The results of the water quality variables trend showed that the Tarom-Khalkhal and Goltape-Zarinabad aquifers with the highest values of electrical conductivity (1778 microsiemens/cm) and total dissolved solids (1135 mg/liter) have lower groundwater quality than other areas in the Sefidrud catchment area. has Also, Tarom-Khalkhal aquifer showed the highest sodium absorption ratio (3.9%) in 80-87 compared to other aquifers. The evaluation of industrial water quality showed that 67% of water samples were corrosive and 32% were depositing. Qualitative zoning analysis for industrial uses showed that the Astana-Kochesfehan and Divandreh-Bijar aquifers and the central part of the Zanjan aquifer and the western areas of the Goltape-Zarbanabad aquifer have sedimentation characteristics and other aquifers have corrosive characteristics.