Groundwater Inflows Characterization in the Pahang-Selangor Raw Water Transfer Tunnel Using δ²H and δ¹⁸O as Tracers

Abstract:

Groundwater inflows represent a very important element in hydrological circulation. Water inflows in Pahang-Selangor Raw Water Transfer Tunnel have been analyzed for isotopes stable of δ²H and δ¹⁸O. 61 samples were collected, including Tunnel Seepage Water (TSW), surface water and hot spring water samples within the study area which to understand the effect of multi topographical scale and geological characteristic. Deuterium (δ²H) and Oxygen-18 (δ¹⁸O) contributes the understanding of the origin and flow paths of water in the mountainous region. The δ²H and δ¹⁸O data obtained from TSW samples ranging from-45.73%₀ to-54.68%₀ and-46.01%₀ to-58.49%₀ are clustered along the local meteoric water line (LMWL) indicating that the groundwater originated from meteoric water. δ²H and δ¹⁸O data, primarily indicate the recharge altitude from 100m–550m which control by the sub vertical flow path mainly from geological structures (i.e. fractures and faults) followed by the groundwater. The altitude effect is indicated by the relation between the stable isotope values and elevation in meters highlighting a depletion of the heavy stable isotope with the increase of the tunnel overburden. The general trend obtained is δ²H and δ¹⁸O decreased with the increase of the overburden. The deviation of the δ²H and δ¹⁸O data from the expected trends may reflect the recharges are coming from the sub-horizontal flow path such as rivers or water infiltration from the valley. The results show that environmental isotopes indicates a better understanding of the complex hydrogeological system in a mountainous region and interaction between groundwater in granitic and meta-sedimentary rock formation along the tunnel project.

• Periodical: Applied Mechanics and Materials (Volume 802)
• Pages: 22-27
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.802.22
• Online since: October 2015
• Authors: Sharifah Farah Fariza Syed Zainal, Mohd Ashraf Mohamad Ismail, Roslanzairi Mostafa, Romziah Azit
• Keywords: Groundwater Inflows, Isotope Stable, Overburden, Tunnel, Tunnel Seepage Water

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