Evaluation of nutrition and environmental risks of water transfer in Zagros tunnel considering hydrogen sulfide gas leakage
Subject Areas : Water and EnvironmentHosein Youzbashi 1 , Hasan Ahmadi 2 * , Azita Behbahani nia 3
1 - PhD student, Civil Engineering-Water Department, Roudhen Branch, Faculty of Engineering, Islamic Azad University, Roudhen, Iran
2 - Assistant Professor, Civil Engineering Department, Rudhan Branch, Islamic Azad University, Rudehen, Iran.*(Corresponding Author)
3 - Assistant Professor, Department of Environment, Roudhen Branch, Faculty of Engineering, Islamic Azad University, Roudhen, Iran.
Keywords: Nutritionism, Zagros Tunnel, Water quality, Experimental model, Leakage. ,
Abstract :
Background and Objective: Zagros tunnel, as the main water carrier of the system and supplying 97% of the incoming flow of the downstream dam reservoir, is facing the problem of underground water infiltration and hydrogen sulfide gas leakage.
Material and Methodology: In the present study, the effects of leakage from the formation on the water quality were quantitatively simulated by modeling the transmission system and input flows regarding the implementation measures for tunnel sealing. Considering the quality of water entering the reservoir at different times, approved experimental methods were used to evaluate the trophic potential of the downstream reservoir.
Findings: Based on the qualitative model used, although the EC of the leakage flow into the tunnel is high and around 3000 (µS/cm), but due to the low flow rate and limited effect on the overall flow of the tunnel, the final flow salinity is 700 (µS/cm). It will not be exceeded and the use of outgoing water for agriculture, despite the high concentration of hydrogen sulfide in the leakage flow, the presence of this gas in the final flow does not create any restrictions. Of course, in years with high rainfall, more leakage and quality degradation can be expected. According to the results, the tank with TSI of about 85 is in high trophic conditions.
Discussion and Conclusion: Due to the short retention time (12 days), it is said that trophicism does not occur in the reservoir, but the research results show that trophicism occurs in the reservoir and water quality management is necessary. With the possibility of increasing nutrients in the future, the potential of nutritionism is also intensified, and in addition, the entry of nitrogen and phosphorus compounds in the reservoir can lead to nutritionism in this small reservoir.
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