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<p>Karst aquifers are one of the most sustainable sources of drinking water in Iran, especially in the south and southwest of Iran. In this research, the Tang-Konareh karst aquifer, located in the south of Yasouj City, was chosen to investigate the hydrochemical type and water quality because it supplies an important part of Yasouj City’s drinking water. For the hydrochemical evaluation of the Tang-Konareh wells, some water characteristics such as electrical conductivity, pH, water temperature, and dissolved oxygen in water were measured <i>in situ</i> in the two seasons of summer and winter of 2020. Continuous measurements of environmental parameters of drinking water and various parameters, such as anions and cations, were performed by analytical methods. According to Piper’s diagram, most of the samples including the wells, springs, and dam samples were found to concentrate in the lower left side of the diamond-shaped field, indicating the hydrochemical type of the HCO<sub>3</sub>-Ca, which is consistent with the geological structure of the aquifer. The Durov’s diagram shows high rates of ion exchange, high rates of dissolution, and mixing of ions in the Tank-Konareh karst aquifer. Based on the national sanitation foundation water quality index (NSFWQI), it can be seen that all the wells have good and excellent water quality (ranging from 86 to 93), while the water quality of both Sarabataveh and Parikadan Springs is good (ranging from 84 to 88) and the water quality of the Shahghasem Dam has acceptable and good water quality for drinking purposes (ranging from 79 to 88). According to Schoeller’s results, the general trend of the concentration of water samples in the present study was excellent and commonly similar. The majority of the Chloro-Alkaline Indice (CAI) ratios were negative (reverse exchange), so there was exchange between calcium and magnesium in water with sodium and potassium in rocks. According to the results of this research, all the samples were located in Zone I (Ca−HCO3 type) of Groundwater Quality Index (GQI), which has an excellent water quality (ranging GQI from 41.61 to 98.46). Finally, regular monitoring and sampling of the karst aquifers is suggested to be done in the drought and wet periods in order to obtain more accurate data and information about its quantitative and qualitative condition.</p>

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Hydrochemistry and water quality of a karst aquifer, Zagros Mountains, Iran

  • 期刊论文

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  • 发表日期：

    2025年10月16日

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  • Mohsen Farzin,
  • Mohammad Sedghi-Asl,
  • Vahid Karimian

摘要

Karst aquifers are one of the most sustainable sources of drinking water in Iran, especially in the south and southwest of Iran. In this research, the Tang-Konareh karst aquifer, located in the south of Yasouj City, was chosen to investigate the hydrochemical type and water quality because it supplies an important part of Yasouj City’s drinking water. For the hydrochemical evaluation of the Tang-Konareh wells, some water characteristics such as electrical conductivity, pH, water temperature, and dissolved oxygen in water were measured in situ in the two seasons of summer and winter of 2020. Continuous measurements of environmental parameters of drinking water and various parameters, such as anions and cations, were performed by analytical methods. According to Piper’s diagram, most of the samples including the wells, springs, and dam samples were found to concentrate in the lower left side of the diamond-shaped field, indicating the hydrochemical type of the HCO3-Ca, which is consistent with the geological structure of the aquifer. The Durov’s diagram shows high rates of ion exchange, high rates of dissolution, and mixing of ions in the Tank-Konareh karst aquifer. Based on the national sanitation foundation water quality index (NSFWQI), it can be seen that all the wells have good and excellent water quality (ranging from 86 to 93), while the water quality of both Sarabataveh and Parikadan Springs is good (ranging from 84 to 88) and the water quality of the Shahghasem Dam has acceptable and good water quality for drinking purposes (ranging from 79 to 88). According to Schoeller’s results, the general trend of the concentration of water samples in the present study was excellent and commonly similar. The majority of the Chloro-Alkaline Indice (CAI) ratios were negative (reverse exchange), so there was exchange between calcium and magnesium in water with sodium and potassium in rocks. According to the results of this research, all the samples were located in Zone I (Ca−HCO3 type) of Groundwater Quality Index (GQI), which has an excellent water quality (ranging GQI from 41.61 to 98.46). Finally, regular monitoring and sampling of the karst aquifers is suggested to be done in the drought and wet periods in order to obtain more accurate data and information about its quantitative and qualitative condition.