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Groundwater tracing in the Poshtenaz karstic area in northern Iran

, : Groundwater tracing in the Poshtenaz karstic area in northern Iran. Pages 375-380 2002

The tracing technique has been recently used in karstified Zagros structural belt in northern Iran. A tracer study (uranine injection) was conducted in Jurassic limestone of the Poshte-Naz area in the Alborz belt to evaluate aquifer parameters and hydraulic relations between a large diameter (about 100 m) sinkhole and springs. A main goal of the project was to find out the source of turbidity of the Emarate drinking water supply spring (SP4) in rainy season. Eight springs, three wells and the Neka River were selected and totally 989 samples in 107 days were collected. In order to select reliable sampling stations, hydrochemical analysis of major ions was carried out and for better interpretation of concentration-time curve, spring discharge was also measured. The results of the tracing by sampling water indicated only a hydraulic connection between Sange-Now spring (SP8) and injection point, while the charcoal packets analysis revealed tracer exits also from spring numbers SP1, SP3, SP4, SP5, SP8, in well s W1 and W2, and in the Neka River. This paper discusses concentration-time curves of charcoal packets for qualitative analysis and exit tracer for quantitative analysis is also assessed.


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