Abstract
Groundwater obtained from water inflows during the excavation of the Pahang–Selangor Raw Water Transfer Tunnel (P-SRWTT) was analyzed to determine the characteristics of groundwater that flows along the main range granite and the metasedimentary geological boundary. A total of 61 tunnel seepage water (TSW) samples were immediately obtained after tunnel excavation. Hydrogeochemical analyses, including physicochemical and major ion analyses, were performed on TSW samples. Results show that the TSW sample in the P-SRWTT is meteoric water, which infiltrates at different elevations and flow paths. The prolonged interactions of groundwater in the metasedimentary rock and contact zones produced Ca2+–HCO3 −–SO4 2−, Ca2+–HCO3 −, and Ca2+–Na+–HCO3 − in the water. Electrical conductivity (EC) values reach as high as 345.80 and 313.22 μs/cm in the metasedimentary rock and contact zones, respectively. Most water in these two zones present temperatures lower than 30 °C, which is comparable with the expected geothermal gradient of 35 °C/km. Ca2+–Na+–HCO3 − is the dominant water type in the granite zone with an average EC of 288.37 μs/cm. Na+–HCO3 − waters are generated through the interaction between Ca2+–HCO3 − and Na+ in granitic rocks. The zone of warm Na+–HCO3 − waters, presenting an average temperature of 35 °C at an overburden of more than 400 m, shows some anomalies from the expected geothermal gradient of 35°/km. The hydrogeochemistry analyses provide a good understanding of the complex hydrogeological system at the two major geological formations along the tunnel.
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Acknowledgments
The authors gratefully acknowledge the assistance and cooperation given by the KeTTHA (Ministry of Energy, Green Technology and Water, Malaysia) and the Tokyo Electric Power Services Co., Ltd. (TEPSCO) to successfully conduct this study. This research was supported by the Exploratory Research Grant Scheme by The Ministry of Education Malaysia (ERGS): The Study of Tunnel Seepage Water (TSW) as a Potential for Groundwater Characterization across the Titiwangsa Main Range, Malaysia, Grant No. 203/PAWAM/6730120.
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Zainal, S.F.F.S., Ismail, M.A.M., Mostafa, R. et al. Hydrogeochemistry of tunnel seepage water along the contact of zone of metasedimentary and granitic rock within the Pahang–Selangor Raw Water Transfer Tunnel Project, Malaysia. Arab J Geosci 9, 265 (2016). https://doi.org/10.1007/s12517-015-2260-2
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DOI: https://doi.org/10.1007/s12517-015-2260-2