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http://dx.doi.org/10.14770/jgsk.2018.54.5.529

Analysis of long-term water level change of Dongrae hot spring using time series methods  

Jeon, Hang-Tak (Department of Geological Sciences, Pusan National University)
Hamm, Se-Yeong (Department of Geological Sciences, Pusan National University)
Cheong, Jae-Yeol (Korea Radioactive Waste Agency (KORAD) R&D Center)
Lee, Cheol-Woo (Korea Institute of Geoscience and Mineral Resources)
Lee, Jong-Tae (Korea Central Hot Spring Institute)
Lim, Woo-Ri (Department of Geological Sciences, Pusan National University)
Publication Information
Journal of the Geological Society of Korea / v.54, no.5, 2018 , pp. 529-544 More about this Journal
Abstract
Dongrae hot spring belongs to the residual magma type and has a long history of bathing since the Silla dynasty in Korea. Due to long development of hot spring water, it is expected that the amount of hot spring water in Dongrae hot spring has been changed. In this study, long-trem water level data of Dongrae hot spring were examined for recognizing the change of the hot spring. By the fluctuation analysis of the hot spring water level from January 1992 to July 2018, the maximum and minimum annual drawdowns of no. 27 well were 137.70 and 71.60 meters, respectively, with an average drawdown of 103.39 m. On the other hand, the maximum and minimum annual drawdowns of no. 29 well were 137.80 and 71.70 meters, with an average drawdown of 103.49 m. Besides, drawdown rate became bigger in recent years. As a result of analyzing autocorrelation of the two wells, the correlation coefficient ranged from 0.919 to 0.991, showing seasonal groundwater level fluctuation. The cross correlation analysis between water level and precipitation as well as water level and hot spring discharge resulted in the correlation coefficients of -0.280 ~ 0.256 and 0.428 ~ 0.553, respectively. Therefore, using Dongnae hot-spring water level data from 1992 to 2018, the Mann-Kendall test and Sen's test showed that the continuous decline of water level was mainly caused by the pumping of the hot spring water among various reasons.
Keywords
Dongrae hot spring; pumping amount of geothermal water; long-term water level change; time series methods; Mann-Kendall test; Sen's test;
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