A systematic approach was used on monthly data from three hydrometric stations located on the Gheshlagh River (west of Iran) to investigate the flow–concentration relationship and for river base flow analysis. According to the results of this study, the water quality of the Gheshlagh River has been affected by changes in river flow as well as human activities. Using the analysis of flow–concentration relationships obtained for Khalife Tarkhan station, the higher concentration of dissolved solids in groundwater (with a base flow rate from 0.1 to 0.7 m³/s) rather than surface runoff was estimated. Also, in this station, with the increase of river flow and improvement of river self-purification capacity, water quality parameters showed a decreasing trend compared to the groundwater. In Hossein Abad's upstream station, due to low average river flow and discharge of saline drainage from agricultural lands, an increasing trend in the dissolved solids both for groundwater and surface runoff was shown. The trend of spatial changes in river water quality also indicates the high impact of human activities such as fish farms and wastewater discharge of Sanandaj wastewater treatment plant, on increasing the concentration of dissolved solids in Dareh Kolleh downstream station.

中文翻译：

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调查河流流量与溶解固体浓度之间的关系

对位于 Gheshlagh 河（伊朗西部）的三个水文测量站的月度数据使用系统方法来研究流量-浓度关系和河流基流量分析。根据这项研究的结果，Gheshlagh 河的水质受到河流流量变化和人类活动的影响。通过对 Khalife Tarkhan 站获得的流量-浓度关系的分析，地下水中溶解固体的浓度较高（基准流量为 0.1 至 0.7 m ³/s) 而不是估计地表径流。此外，该站随着河流流量的增加和河流自净能力的提高，水质参数与地下水相比呈下降趋势。在 Hossein Abad 的上游站，由于平均河流流量较低，以及从农田排出的咸水排水，地下水和地表径流的溶解固体均呈上升趋势。河流水质的空间变化趋势也表明，养殖场和 Sanandaj 污水处理厂废水排放等人类活动对 Dareh Kolleh 下游站溶解固体浓度增加的影响很大。