Evaluation of hydrogeological impact of Taleghan Water Conveyance Tunnel excavation on the discharge of springs

Authors

1 Geology group, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 PhD, Department of Applied Geology, Faculty of Earth Sciences, Kharazmi University, Tehran. Expert of Fannavaran Tarh Jame Consulting Engineers, Tehran, Iran

Abstract

The inaccurate prediction of spring discharge reduction caused by tunneling can lead to a range of social, technical, economic, and environmental challenges. In this study, the impact of excavating the eastern section of the Taleghan water conveyance tunnel on the surrounding springs has been evaluated using the DHI (Drawdown Hazard Index) and TIS (Tunneling Impacts on Springs) methods. An analysis was carried out on 23 springs surrounding the tunnel. In the DHI method, various factors such as fracture frequency, rock mass permeability, overburden, plastic zone radius, major fault intersections, spring type, and distance from the tunnel were integrated into a fully coupled model. Additionally, the TIS model was developed by integrating four key parameters: the volume of water inflow toward the tunnel, the distance between the spring and the tunnel, hydraulic connectivity, and the aquifer's recharge potential. The results indicated that, according to the TIS method, none of the water sources will completely dry up. However, the DHI method predicts that this condition will occur for seven springs within the study area. Overall, the findings demonstrate that the DHI method accounts for more critical conditions compared to the TIS method. As a result, it is recommended to use a combination of both DHI and TIS methods to assess the potential future impacts on groundwater resources caused by the excavation of water transfer tunnels.

Keywords

Main Subjects

References

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Advanced Applied Geology
Volume 14, Issue 3
October 2024
Pages 829-854

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