울릉도 추산용출소의 용출 특성 = Discharge Characteristics of the Chusan Spring, Ulleung Island

다국어 초록 (Multilingual Abstract)

The source of Chusan Spring water in the Ulleungdo is the precipitation in the Nari caldera basin, which permeates in theTrachitic pumice and tuff area and moves downward, outflowing at the lithologic boundary between the trachyte and Narituff. It is known that the discharge rate of the Chusan Spring is large enough to be used for the small hydroelectric powergeneration, but the exact discharge rate and hydrogeologic characteristics have not been known. The discharge rates of theSpring were measured 11 times, which ranged from 15,220 m3/d to 36,278 m3/d. The discharge rates, measured by theautomatic level recorder, for two-year period, were 20,000~38,000 m3/d. The variation of discharge rates did not coincidewith rainfall event, but showed daily increases of 3,000~5,000 m3/d. The annual discharge rate excluding theevapotranspiration and the surrounding stream discharge corresponded to 70.6% of the annual precipitation of the rechargearea. Therefore, meteorological observations at the Nari basin, rather than the Ulleung-do meteorological station, are moreappropriate to properly interpret the discharge characteristics of the Chusam Spring and the recharge rate of the basin.

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