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수직 라인 관측시스템을 이용한 제주 동부 해안대수층에서 해수침투 모니터링 평가
장호준,하규철,황인욱,김기표,박원배,Jang, Hojune,Ha, Kyoochul,Hwang, Inuk,Kim, Gee-Pyo,Park, Won-Bae 한국지하수토양환경학회 2021 지하수토양환경 Vol.26 No.3
Groundwater monitoring is commonly practiced with real-time sensors placed in several depth spots in aquifer. However, this method only provides monitoring data at the point where the sensors are installed. In this study, we developed a vertical line monitoring system (VLMS) that can provide continuous data of groundwater parameters along the vertical depth. The device was installed in a well located on the coast of the eastern part of Jeju island to monitor electrical conductivity, temperature, salinity, pH, dissolved oxygen, and oxidation-reduction potential over approximately 3 months from September 11 to December 3, 2020. The results indicated that the groundwater levels fluctuated with the tidal change of seawater level, and the upper and lower boundaries of the freshwater and saltwater zone in the groundwater were located at below 16 m and 36 m of mean sea level, respectively. There was a large variation in EC values during the high tide and temperature change was the greatest during flow tide. Although further investigation is needed for improvement of the device to obtain more accurate and reliable data, the device has a potential utility to provide fundamental data to understand the seawater intrusion and transport mechanisms in coastal aquifers.
지진에 의한 제주도 지하수위 변동 분석 (2010년 인도네시아 규모 7.7 지진)
이수형,함세영,하규철,김용철,정범근,고경석,고기원,김기표,Lee, Soo-Hyoung,Hamm, Se-Yeong,Ha, Kyoo-Chul,Kim, Yong-Cheol,Cheong, Beom-Keun,Ko, Kyung-Seok,Koh, Gi-Won,Kim, Gee-Pyo 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.2
This study was conducted to investigate the relationship between groundwater level change and a large earthquake using the data of groundwater and seawater intrusion monitoring wells in Jeju Island. Groundwater level data from 13 observation wells were analyzed with a large earthquake. The Earthquake occurred at Sumatra, Indonesia (Mw = 7.7) on 13 June 2010, and groundwater level anomalies which seems to be related to the Earthquake were found in 6 monitoring wells. They lasted for approximately 16~27 minutes and the range of groundwater level fluctuations were about 1.4~2.4 cm. Coefficient of determination values for relationship between groundwater level change and transmissivity, and response time were calculated to be $R^2$ = 0.76 and $R^2$ = 0.96, respectively. The study also indicates that the high transmissivity of aquifer showed the high goundwater level changes and longer response time.
논문(論文) : 닐하우스에서 모은 빗물의 수질평가 연구 : 제주도 사례
이봉주 ( Bong Joo Lee ),문상호 ( Sang Ho Moon ),김용철 ( Yong Cheol Kim ),김기표 ( Gee Pyo Kim ),강봉래 ( Bong Rae Kang ),고기원 ( Gi Won Koh ),박기화 ( Ki Hwa Park ) 대한상하수도학회 2008 상하수도학회지 Vol.22 No.3
Recently there has been a great deal of interest in promotion of the utilization of rainwater. In this paper, we compared qualities of the rainwater collected from the top of vinyl houses to those of precipitated rainwater itself in Jeju Island. The pH of the collected rainwater was acidic and lower than the precipitated one. As a storm progresses, the pH of the collected water gradually increases. Ranges of EC of the precipitated and collected rainwater were 1-118 and 1-475 μS/cm. Most of Cl and turbidity values of the collected rainwater were less than 20 mg/L and 20 NTU, while those of the precipitated rainwater were less than 10 mg/L and 5 NTU. Differences in qualities between precipitated and collected rainwater indicate that qualities of the collected rainwater should be changed by the first flush effects, and imply that long term continuous monitoring for the qualities of collected rainwater is essential to quantify the first flush phenomenon more accurately.
논문 : 제주도 수리자료에 대한 시계열 분석 및 지하수 함양률 추정 연구
최현미 ( Hyun Mi Choi ),이진용 ( Jin Yong Lee ),하규철 ( Kyoo Chul Ha ),김기표 ( Gee Pyo Kim ) 대한지질공학회 2011 지질공학 Vol.21 No.4
제주도 지하수위, 지하수온, 전기전도도의 변동특성 및 상관관계를 평가하고 또 지하수위변동법을 이용하여 지하수 함양률을 추정하였다. 자기상관분석을 통하여 각 관정 별 수위의 지연시간과 조절시간을 산정한 결과 자기상관성은 JM안성 관정이 가장 컸다. 그리고 교차상관분석으로 전기전도도-수위, 강수량-수위, 기온-수온 간의 상관성을 분석하고 비교하였다. 분석결과 전기잔도도-수위는 JR서광2, 강수량-수위는 JD하모, 기온-수온은 JI원종장2가 상호연관성이 가장 높았다. 지하수 함양률과 함양량을 산정한 결과 함양률은 평균 39.61%, 함양량은 평균 1,153, 490,407 m3/yr으로 산정되어 기존의 연구결과와 유사하였다. We examined temporal variations in and relationships among groundwater level, groundwater temperature, and electric conductivity, and estimated groundwater recharge at Jeju Island, The time lag and regulation time of groundwater level data revealed that monitoring well in Ansung (JM-AS) has the highest auto-correlation. The cross-correlations for electric conductivity-water level, precipitation-water level, and air temperature-water temperature revealed that monitoring well in Seogwi-2 (JR-SG2) (electric conductivity-water level), monitoring well in Hamo (JD-HM) (precipitation-water level), and monitoring well in Wonjongjang-2 (JI-WJJ2) (air temperature-water temperature) had the highest cross-correlations. The average groundwater recharge ratio was 39.61%, and the average groundwater recharge amount was 1,153,490,407 m3/yr, which is consistent with the results of previous studies.
이봉주 ( Bong Joo Lee ),문상호 ( Sang Ho Moon ),김기표 ( Gee Pyo Kim ),김용철 ( Yong Cheol Kim ),김용제 ( Yong Je Kim ),고기원 ( Gi Won Koh ) 대한지질공학회 2008 지질공학 Vol.18 No.3
다양한 조건의 관정에서 지하수를 채수할 수 있는 샘플러를 개발하고 평가하였다. 이 샘플러는 공압 튜브, 공압 실린더, 주사기 바늘 그리고 샘플병으로 구성되며, 공기압을 동력원으로 사용한다. 공압 실린더는 주사기 바늘을 샘플병의 고무마개에 관통시키는 기능을 담당하며, 샘플병 고무마개를 관통한 주사기 바늘은 샘플병으로의 지하수 유입 통로 역할을 담당한다. 샘플러 현장시험은 해수의 영향으로 수질이 주기적으로 변화하는 제주 한동지역의 해수침투 관측정을 대상으로 하였다. 샘플러의 내부와 외부에 CTD Diver를 장착하고 관정내 동일 심도에서의 샘플링을 여러 차례 반복하면서 샘플링 단계별 전기전도도와 압력 변화를 측정하였다. 시험 결과, 샘플러를 작동시킬 때에만 지하수가 샘플러로 유입되며, 샘플러 내부와 외부에서 측정한 지하수의 전기전도도와 압력은 거의 일치하는 것이 확인되었다. 이러한 결과는 이 연구에서 제시한 샘플러를 이용하여 채수한 지하수 시료들이 샘플러 설치 심도의 샘플링 시간대의 지하수 수질을 정확하게 반영하고 있음을 지시한다. A new ground water sampler was developed and evaluated for target depth sampling under most rigorous field conditions. This new concept sampler comprises an air-cylinder, a hypodermic needle and a sampling bottle. Pressurized air or nitrogen gas can be used as a mechanical power source to operate the sampler. The air-cylinder is used to jab the hypodermic needle into the rubber cap of the sampling bottle. The hypodermic needle functions as a pathway to inject groundwater into the sampling bottle. Field test was conducted in a seawater intrusion monitoring well located at Handong district of Jeju Island. Water qualities in this well are periodically changed from the effects of sea water. Water sampling for the same target depth in this well were tried at various times, and variations in electrical conductivity and pressure at the inside and outside of the sampler were measured using CTD divers. We found that the device could collect water samples only when it was actuated, and the pattern and range of variations in electrical conductivities and pressures measured at the inside and outside of the sampler were nearly identical. These results indicate that water samples using the sampler presented in this study represent correctly water qualities in which the samplings were made at a specific target depth in a well.