Kang-Geun Lee

지하수위와 하천수위와의 상호반응과 수리적으로 다른 특성을 가지는 각 층별(실트질 모래층, 자갈모래층, 풍화대층) 반응관계를 알아보기 위하여 시계열 분석에서 많이 사용되어 온 방법인 자기상관분석과 교차상관분석방법을 이용하였다. 만경강 하천부지에 각 층을 대표하는 깊이에서 지하수위를 관측한 결과, 지하수위가 강수량보다는 하천수위변동에 민감하게 반응하고 있었다. 연구지역의 하천수위변동은 만경강 제수문의 조절과 조석의 영향을 받아 주기적인 수위변동이 우세하기 때문에 강수량과의 상관성은 낮다. 다심도 관정에서 각층별 하천수위에 대한 지하수위 반응은 시간지연 없이 서로 같이 변동하는 것으로 나타났으며, 반응시간은 하천과 가까운 관정에서 30-60분 이내로 빠르며 하천에서 거리가 멀어지면서 반응시간은 대체로 늦게 나타났다. 그러나 하천과 멀리 떨어져 있는 관정이더라도 하천수위에 대하여 빠른 반응을 보이는 관정이 있으며, 이는 하천과 대수층과의 높은 수리적 연결성을 나타낸다. 지하수위의 하천에 대

We examined levels of soil contamination by trichloroethylene (TCE) at an industrial complex in Wonju, Korea. The examination was focused on the surrounding area of an asphalt laboratory where TCE had been used as a solvent for testing the asphalt quality. TCE contamination in soil was found at depths of 1~5 m and ranged between 0.13 and 14,702.82 mg/kg. However, the soil contamination was restricted in immediate proximity of the laboratory. Batch isotherm experiments showed that there was a lin

제주도는 투수성이 좋은 화산암류로 형성이 되어 지표수의 발달이 빈약하므로 수원의 대부분을 지하수에 의존하고 있다. 따라서 지구 온난화로 인한 해수면 상승이 발생하여 지하수로의 해수 침투가 발생할 경우 매우 심각한 문제에 봉착할 수 있는 취약성을 지녔다. 본 연구에서는 장기 조위 관측 자료를 토대로 한반도 주변과 제주도 근해의 장기 적인 해수면 변화를 분석하였다. 그 결과, 최근 40년 간 한반도 주변에서 해수면이 2.16 ± 1.71 mm/yr의 속도로 뚜렷 한 상승 양상을 보였으며 제주도 해안에서는 더욱 빠른 속도로 해수면이 상승해 왔음을 알 수 있었다. 또한 제주특 별자치도의 지하수/해수침투관측망의 지하수 관측 자료를 통하여 갈수기 중 해수면이 연주기적으로 상승하는 4-5개 월 정도의 시기 동안 해수면의 상승에 따라 염수대가 육지 쪽으로 확장하여 침투하고 있는 것을 관측할 수 있었다. 이를 통하여 제주도 동부 지역이 장기적으로 해수면의 상승에 따라 염수대가 육지 쪽으로 확장하여

An area accommodating various industrial facilities has fairly high probability of groundwater contamination with multiple chlorinated solvents. Source identification of multiple chlorinated solvents is an essential procedure for the management and remediation of contaminated groundwater. Hydrogeologic investigations and periodic collection of groundwater chemical data in an industrial complex in Wonju, Korea were used for the source identification of multiple chlorinated solvents. In this study

This study investigates the application of time series analysis for evaluating groundwater discharge rates into a subway system in Seoul, Korea. A time series of daily precipitation and groundwater discharge rates observed at three subway stations Gireum, Garibong and Sadang stationin 2001 were used for the time series modeling. Correlation analyses show that groundwater discharge rates are auto-correlated and correlated with precipitation. Based on these correlation analyses, the transfer funct

This study presents the optimal groundwater remediation design using a pump and treat method by optimizing the clean-up time, which is a critical factor to determine an optimal remediation design in practical applications. In this study, a simulation-optimization approach was used to determine an optimal remediation design. For a simulation-optimization approach, MODFLOW and MT3D models were used for simulating groundwater flow and mass transport, and the genetic algorithm (GA) was applied for o

한국수자원공사는 2004년 현재 전국에 걸쳐 266개의 국가 지하수관측소를 운영하고 있으며 자동센서를 통하여 매 6시간마다 지하수위, 전기전도도 및 수온을 관측기록하고 있다. 지하수위는 해당 지하수 시스템의 물리적 특성을 반영하는 인자로 시계열 형태로 나타난다. 그런데 전통적인 통계기법으로는 자기상관성이 큰 연속적인 수위자료의 특성을 나타내는데 어려움이 있다. 본 연구에서는 지하수위 자료를 분석하기 위한 도구로서 시계열분석에 관한 이론적 배경을 검토하고 또 한강권역에 속하는 국가지하수 관측소에서 획득한 지하수위 자료의 변동 패턴을 분류하여 각 패턴에 대한 시계열 모형의 분석가능성을 평가하였다.

Changes in groundwater table due to dewatering ofexcavations at the subway pumping station in Seoul were investi-gated. There are total 8 subway lines in the Seoul area, the totallength of 173 km; Line 1-8 are on operating. To lower the ground-water table beneath the subway tunnel, groundwater is extractedby the rate. The 1-5 lines subway network drains groundwater atthe rate of 78,417 m3/day. The tunnels of lines 6-8 are locatedlower than lines 1-5 and they are needed groundwater extractionmore

Well production by a riverbank filtration facility with multi-radial collector well systems in Jeungsan-ri, Changnyeong gun, Korea was evaluated. In this study, the drawdown at collector wells due to pumping and groundwater inflow rates along the horizontal arms of the collector wells were computed through numerical simulations. Sensitivities of the well production to hydraulic conductivity and well flow coefficient, which represents the resistance to the flow from the aquifer to the horizontal

A combined pumping and tracer test was conducted at a highly fractured aquifer system. The hydrogeologic units underlying the test site are reclamation soil, weathered rock layer, and fractured layer. The fractured layer is the main aquifer for this site. Prior to pumping and tracer tests, slug tests were conducted at four test wells. The test data revealed existence of a low permeability zone near well OB-1. Generally the estimated hydraulic conductivities are in the order of 10-4 cm/sec. A pum

Lineament density maps can be used for the quan-titative evaluation of relationships between lineaments and theoccurrence of groundwater. This paper reports the usefulness ofthe representative elementary area (REA) concept for lineamentanalysis. This concept refers to the area of the unit circle neededto calculate the lineament density factors distributed within thecircle: length, counts and cross-points counts. The circle is a unitcircle where one calculates the sum of the lineament length, lin

The effect of bio-geochemical processes on speciation, fate, and transport of arsenic was investigated through the laboratory tests. Shewanella sp., iron-reducing bacteria, was used for batch and column tests. In contrast to the control batch test, the bio-active batch test indicated that Shewanella sp. reduced As(V) to As(III) with concurrent oxidation of lactate to acetate and the decrease of Eh. As time went, a significant amount of the precipitates were formed, and the removal of arsenic spe

The monitoring of temporal and spatial variations of groundwater quality is important for better managing groundwater resources. In a heavily cultivated agricultural site, Yupori, Chuncheon (Korea), groundwater quality has been monitored since 2002 because the groundwater in this area contains elevated levels of nitrate. Concentrations of NO3-N, SO42, and Cl were found to be high in vegetable fields and low in fruit orchards. For groundwater management purposes, a regional Kendall test was car