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http://dx.doi.org/10.9720/kseg.2011.21.2.125

Discharge characteristics of the Seodo Mulgol Spring, Dokdo  

Cho, Byong-Wook (Groundwater Department, Korea Institute of Geoscience and Mineral Resources)
Yun, Uk (Groundwater Department, Korea Institute of Geoscience and Mineral Resources)
Lee, Byeong-Dae (Groundwater Department, Korea Institute of Geoscience and Mineral Resources)
Song, Won-Kyong (Groundwater Department, Korea Institute of Geoscience and Mineral Resources)
Hwan, Jae-Hong (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
Choo, Chang-Oh (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
The Journal of Engineering Geology / v.21, no.2, 2011 , pp. 125-131 More about this Journal
Abstract
The discharge characteristics of the Seodo Mulgol Spring-the only groundwater-producing area in Dokdo-were evaluated by measurements of discharge rate and electrical conductivity (EC) on five occasions. The Seodo Mulgol Spring is fed by rainfall in upstream areas of the Mulgol cave, and the rainwater of the area moves down along cooling joints developed in trachyandesite II and trachyte, finally discharging at the Mulgol cave. The discharge rate of the Seodo Mulgol Spring varied from 1.12 to 7.02 $m^3/d$ during the study period and EC varied from 2,650 to 3,390 ${\mu}S/cm$, showing a sharp increase during heavy rainfall. The observed variations in discharge rate and EC at the Seodo Mulgol Spring are attributed to the relatively short distance between the recharge area and the Mulgol cave, and to the rapid movement of groundwater through columnar joints developed in trachyandesite II and trachyte. Additional discharge measurements, combined with precise rainfall data, are required at Dokdo to elucidate the discharge characteristics of the Seodo Mulgol Spring.
Keywords
Mulgol; Trachyte; Trachyandesite; Discharge rate; Electrical conductivity;
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