• Old Water Contributions to a Granitic Watershed, Dorim-cheon, Seoul
  • Kim, Hyerin;Cho, Sung-Hyun;Lee, Dongguen;Jung, Youn-Young;Kim, Young-Hee;Koh, Dong-Chan;Lee, Jeonghoon;
  • Dept. of Science Education, Ewha Womans University;National Instrumentation Center for Environmental Management (NICEM), Seoul National University;National Instrumentation Center for Environmental Management (NICEM), Seoul National University;Groundwater department, Korea Institute of Geoscience and Mineral Resources (KIGAM);Dept. of Science Education, Ewha Womans University;Groundwater department, Korea Institute of Geoscience and Mineral Resources (KIGAM);Dept. of Science Education, Ewha Womans University;
Abstract
It is reported that the intensity of rainfall will likely increase, on average, over the world on 2000. For water resources security, many studies for flow paths from rainfall or snowmelt to subsurface have been conducted. In Korea, few isotopic studies for characterizations of flow path have been undertaken. For a better understanding of how water derived from atmosphere moves to subsurface and from subsurface to stream, an analysis of precipitation and stream water using oxygen-18 and deuterium isotopes in a small watershed, Dorim-cheon, Seoul, was conducted with high resolution data. Variations of oxygen-18 in precipitation greater than 10‰ (δ18Omax = −1.21‰, δ18Omin = −11.23) were observed. Isotopic compositions of old water (groundwater) assumed as the stream water collected in advance were −8.98‰ and −61.85‰ for oxygen and hydrogen, respectively. Using a two-component mixing model, hydrograph separation of the stream water in Dorim-cheon was conducted based on weighted mean value of δ18O. As a result, except of instant dominance of rainfall, contribution of old water was dominant during the study period. On average, 71.3% of the old water and 28.7% of rainfall contributed to the stream water. The results show that even in the small watershed, which is covered with thin soil layer in granite mountain region, the stream water is considerably influenced by old water inflow rather than rainfall.

Keywords: Hydrograph separation;Stable water isotopes;Granite region;Old water contribution;

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This Article

  • 2015; 20(5): 34-40

    Published on Oct 31, 2015

  • 10.7857/JSGE.2015.20.5.034
  • Received on Oct 6, 2015
  • Revised on Oct 8, 2015
  • Accepted on Oct 13, 2015