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The groundwater levels at 11 sites and the vertical variations of the water quality at 1 site were measured to study the characteristic of the groundwater level fluctuation of Cheju Island. The results of the measurements for the groundwater levels were as follows; In the eastern part, inculding Kimnyong, Jongdal and Sungsan, a sinusoidal fluctuation of groundwater levels occured in response to oceanic tides. The tidal effect on the groundwater level was reduced depending upon the distance from seashore. But time lag showed that the trend is reversed. However, in the Samyang, Kosan and Shinhyo areas show that the groundwater level was directly influenced by the amount of precipitation. Especially, Shinhyo area which southern part in Cheju was affected the most and show upper parabasal groundwater level. In Susan-I which eastern part in Cheju, well revealed that water quality changed with the period of a tide. Salinity at the 11m, bellow the natural groundwater level, was approched to the brackish groundwater(1000ppm).
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UCI(KEPA) : I410-ECN-0102-2023-451-001820247