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제주도 동부 해안대수층의 수리특성 산정과 지하수위 예측
조시범 ( Si Beom Jo ),전병칠 ( Byung Chil Jeon ),박은규 ( Eun Gyu Park ),최광준 ( Kwang Jun Choi ),송성호 ( Sung Ho Song ),김기표 ( Gi Pyo Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.4
Due to tidal force, it is very difficult to estimate the hydraulic parameters of high permeable aquifer near coastal area in Jeju Island. Therefore, to eliminate the impact of tidal force from groundwater level and estimate the hydraulic properties, tidal response technique has been mainly studied. In this study we have extracted 38 tidal constituents from groundwater level and harmonic constants including frequency, amplitude, and phase of each constituent using T_TIDE subroutine which is used to estimate oceanic tidal constituents, and then we have estimated hydraulic diffusivity associated with amplitude attenuation factor(that is the ratio of groundwater level amplitude to sea level amplitude for each tidal constituent) and phase lag(that is phase difference between groundwater level and sea level for each constituent). Also using harmonic constants for each constituent, we made the sinusoidal wave and then we constructed the synthesized wave which linearly combined sinusoidal wave. Finally, we could get residuals(net groundwater level) which was excluded most of tidal influences by eliminating synthesized wave from raw groundwater level. As a result of comparing statistics for synthesized level and net groundwater level, we found that the statistics for net groundwater level was more insignificant than those of synthesized wave. Moreover, in case of coastal aquifer which the impact of tidal force is even more than those of other environmental factors such as rainfall and groundwater yield, it is possible to predict groundwater level using synthesized wave and regression analysis of residuals.
정찬호 ( Chan Ho Jeong ),이용천 ( Yong Cheon Lee ),이유진 ( Yu Jin Lee ),최현영 ( Hyeon Young Choi ),고기원 ( Gi Won Koh ),문덕철 ( Duk Chul Moon ),정차연 ( Cha Youn Jung ),조시범 ( Si Beom Jo ) 대한지질공학회 2016 지질공학 Vol.26 No.4
본 연구에서는 제주 서귀포지역에서 산출되는 온천수 2지점과 탄산수 2지점에 대한 화학성분, CFCs (Chlorofluorocarbons) 동위원소, δ<sup>18</sup>O, δD, δ<sup>13</sup>C 동위원소, 영족기체(He, Ne) 동위원소 분석을 통하여 탄산온천수와 탄산수의 수리화학적 특성, 생성 연령, 영족기체의 기원과 CO<sub>2</sub> 가스의 기원을 해석하였다. 연구지역의 탄산수의 pH는 6.21~6.84의 범위의 약산성과 매우 높은 전기전도도 값(1,928~4,720 μS/cm)의 특성을 보인다. 화학적 유형은 Mg(Ca,Na)-HCO<sub>3</sub> 내지는 Na(Ca,Mg)-HCO<sub>3</sub> 유형을 보인다. 환경추적자인 CFCs 농도를 이용하여 지하수 연령측정결과, 탄산수는 약 47.5~57.2년, 지하수는 약 30.3~49.5년으로 추정되었다. 탄산수의 δ<sup>13</sup>C값은 -1.77~-7.27‰의 범위를 보여 CO<sub>2</sub> 가스의 기원은 심부기원과 일부 심부-무기기원의 혼합 기원으로 도시되었지만, 영족기체 조성비(<sup>3</sup>He/<sup>4</sup>He, <sup>4</sup>He/<sup>20</sup>Ne)에서 헬륨가스가 심부기원의 농도가 절대적으로 높은 값을 보여 화산활동과 관련한 심부 마그마 기원임을 보여준다. In this study, geochemical composition, CFCs (Chlorofluorocarbons), δ<sup>18</sup>O, δD, δ<sup>13</sup>C isotopes and noble gases isotopes (He, Ne) were analyzed to determine their recharge age, source of CO<sub>2</sub> gas and noble gases of carbonated hot spring water and carbonated- water samples collected in the Seoqwipo of the Jeju. The pH of the carbonated waters ranges from 6.21 to 6.84, and the high electrical conductivity range (1,928~4,720 μS/cm). Their chemical composition is classified as Mg(Ca, Na)-HCO<sub>3</sub> and Na(Ca, Mg)-HCO<sub>3</sub> types. As a result of the calculation of groundwater age using CFCs concentrations as an environmental tracer, the carbonated water and groundwater were estimated to be about 47.5~57.2 years and about 30.3~49.5 years, respectively. The δ<sup>13</sup>C values of carbonated water range from -1.77 to -7.27‰, and are plotted on thr deep-seated field or the mixing field of the deep-seated and inorganic origin. Noble gases isotopic (<sup>3</sup>He/<sup>4</sup>He, <sup>4</sup>He/<sup>20</sup>Ne) ratio shows that helium gas of carbonated hot waters comes from deep-seated magma origin.