• 지질공학
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• 제12권2호
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• pp.215-234
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• 2002

지하수댐은 대용량의 지하수를 효과적으로 확보할 수 있는 시설로서 저류수는 유역조건과 대수층조건, 상류부 오염원 분포와 수질에 따라 상수도용, 중수도용, 농업용 또는 공업용 등으로 다양하게 이용할 수 있으므로 적절한 지하수범 설치 방법은 용수부족을 해결할 수 있는 주요 기술의 하나이다. 지하수법을 활성화시키기 위해서는 대수층 위치 및 지층에 맞는 적절한 차수공법의 선택과 정밀한 물막이벽 시공, 대수층 구조·수문·물수지 등의 정확한 분석, 장기적인 지하수 이용계획과 저류역내 수질보전대책 수립, 수위·수질에 대한 장기 모니터링 실시로 지속적인 유지관리, 지속가능한 대용량 취수기술에 대한 조속한 연구, 지하수댐 개발로 인한 주변환경에 미치는 영향에 대한 철저한 분석 및 대책 수립 등이 필요하다. 그리고 해안지역 지하수법에서 발생하는 염수침입 현상을 방지하는 방안으로 물막이벽을 이중으로 설치하는 방법이 있다.

• 터널과지하공간
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• 제14권4호
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• pp.287-294
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• 2004

지하암반 냉동저장고 주변의 온도분포를 예측하기 위하여, FLAC을 이용한 2차원 및 3차원 수치해석을 수행하였다. 수치해석 수행 시 암반 열물성에 대한 지하수 및 동결잠열의 영향을 고려하였으며, 2차원 및 3차원 수치해석 결과와 5년간의 지하암반 온도계측 자료를 비교하였다. 2차원 수치해석 결과 실험실 물성을 이용한 경우는 계측 결과와 큰 오차를 나타내었으며, 지하수 부피비 20% 및 동결잠열을 고려한 수치해석 결과가 계측 결과와 가장 작은 오차를 나타내었다. 하지만, 냉동기 가동시간이 증가하면서 지표면으로의 열 유동의 영향으로 커지는 오차는 커지는 경향을 나타내었다. 지표면의 영향을 고려하는 3차원 수치모델을 정립하여 수치해석을 수행한 결과, 지하수 및 동결잠열의 영향을 고려한 수치모델이 계측 결과가 잘 일치하는 경향을 나타내었다.

• 한국지반공학회논문집
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• 제22권10호
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• pp.5-20
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• 2006

본 논문에서는 지하수위 하에서 터널이 시공되는 조건을 대상으로 응력-간극수압 연계 유한요소해석 수행시 모델링 측면에서 중요하게 다뤄져야 하는 내용을 고찰하였다. 먼저 연계해석 수행시 요구되는 지하수위 저하와 지반거동과의 관계에 대한 배경 이론을 알아보았으며, 이를 토대로 모델링 측면에서 해석결과에 영향을 미칠 수 있는 다양한 인자들을 선정하고, 선정된 영향인자에 대한 매개변수 연구를 수행하였다. 지하수위 저하가 동반되는 터널 시공조건에서의 유한요소석 모델링 결과는 지반의 불포화특성 고려여부가 가장 큰 영향을 미치는 것으로 나타났으며 본 고에서는 결과를 종합하여 연계해석 모델링시 중요하게 검토되어야 고려사항을 제시하였다.

• 한국환경과학회지
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• 제11권1호
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• pp.57-61
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• 2002

To investigate the flow characteristics by the water stage variation between stream-aquifer, the new solution of nonlinear Boussinesq equation was derived and extended using the Boltzmann transformation. The soundness of the analytic solution obtained from this study was examined by the comparison with the linearized analytic solution and the numerical solution by finite difference method. And the movement, velocity, flowrate and volume of flow caused by the stage variation of stream and the existence of regional gradient were estimated. This new analytic solution can express the groundwater movement between stream-aquifer. So, it might be helpful to manage water environment.

• 한국물환경학회지
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• 제23권6호
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• pp.973-984
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• 2007

This study developed and calculated alternative evaluation index (AEI) from the effectiveness analyses of alternatives for rehabilitation of distorted hydrologic cycle. The feasible alternatives for the poor-conditioned region in the Anyangcheon watershed were proposed and quantitatively analyzed using continuous water quantity/quality simulation model, Hydrological Simulation Program-Fortran (HSPF). The effectiveness analyses include 355th flow and 275th flow of flow duration curve and number of increased days to satisfy the target monthly flow for water quantity and BOD average concentration, total daily loads and number of increased days to satisfy the target concentration and total daily loads. The feasible alternatives are restoration of covered stream, prevention of streamflow loss through sewers, redevelopment of existing reservoir, reuse of treated wastewater, use of groundwater collected by subway stations and construction of small wastewater treatment plant. Therefore, alternative priority ranking was derived from AEIs. It will be effective to make an integrated watershed management for sustainable development.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.439-439
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• 2015

The temporal and spatial relationship of the weather elements such as rainfall and temperature is closely linked to the streamflow simulation, especially, to the flood forecasting problems. For the study area, Imjin river basin, which has the specific characteristics in geography with river cross operation between North and South Korea, the meteorological information in the northern area is totally deficiency, lead to the inaccuracy of streamflow estimation. In the paper, this problem is solved by using the combination of global (such as soil moisture content, land use) and local hydrologic components data such as weather data (precipitation, evapotranspiration, humidity, etc.) for the model-driven runoff (surface flow, lateral flow and groundwater flow) data in each subbasin. To compute the streamflow in Imjin river basin, this study is applied the hydrologic model SURR (Sejong Univ. Rainfall-Runoff) which is the continuous rainfall-runoff model used physical foundations, originally based on Storage Function Model (SFM) to simulate the intercourse of the soil properties, weather factors and flow value. The result indicates the spatial variation in the runoff response of the different subbasins influenced by the input data. The dependancy of runoff simulation accuracy depending on the qualities of input data and model parameters is suggested in this study. The southern region with the dense of gauges and the adequate data shows the good results of the simulated discharge. Eventually, the application of SURR model in Imjin riverbasin gives the accurate consequence in simulation, and become the subsequent runoff for prediction in the future process.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.215-216
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• 2023

Leakage in the structure due to the irregular flow of groundwater in the underground structure penetrates into internal spaces such as underground parking lots and basement through underground walls, which is expensive in terms of maintenance of the building. In this study, various composite waterproofing methods installed on the outer walls of underground structures were selected to evaluate the structural performance of composite specimens due to bending behavior through experiments and analysis on bending test behavior on concrete attachment surfaces.

• Bulletin of the Korean Chemical Society
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• 제32권9호
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• pp.3437-3442
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• 2011

An on-line flow injection analysis with dual pre-concentration method was developed to determine the ultra trace tri and hexavalent chromium in water. In this system, the cation and anion pre-concentration columns were combined with a 10-port injection valve and then used to separate and concentrate Cr (III) and Cr (VI) selectively. The two species of concentrated chromium were sequentially eluted and determined by using HCl-KCl buffer of pH 1.8 as an eluent. Cr (III) was oxidized by hydrogen peroxide to Cr (VI). It was detected spectrophotometrically at 548 nm by complexation with DPC (diphenylcarbazide). Several factors such as concentration of $H_2O_2$, DPC and coil length in reaction condition were optimized. The linear range for Cr (III) and Cr (VI) was 0.1-50 ${\mu}g$/L. The limit of detections ($3{\sigma}$) of Cr (III) and Cr (VI) were 52 ng/L and 44 ng/L under the optimized FIA system, and their recoveries 98% and 103%, respectively. This method was applied to analyze contamination level of chromium species in tap water, groundwater and bottled water.

• 한국물환경학회지
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• 제36권6호
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• pp.592-610
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• 2020

In South Korea, the concept of water environment was expanded to include aquatic ecosystems with the Integrated Water Management implementation. Watershed-scale modeling is typically performed for hydrologic component analysis, however, there is a need to expand to include ecosystem variability such that the modeling corresponds to the social and political issues around the water environment. For this to be viable, the modeling must account for several distinct features in South Korean watersheds. The modeling must provide reasonable estimations for peak flow rate and apply to paddy areas as they represent 11% of land use area and greatly influence groundwater levels during irrigation. These facts indicate that the modeling time intervals should be sub-daily and the hydrologic model must have sufficient power to process surface flow, subsurface flow, and baseflow. Thus, the features required for watershed-scale modeling are suggested in this study by way of review of frequently used hydrologic models including: Agricultural Policy/Environmental eXtender(APEX), Catchment hydrologic cycle analysis tool(CAT), Hydrological Simulation Program-FORTRAN(HSPF), Spatio-Temporal River-basin Ecohydrology Analysis Model(STREAM), and Soil and Water Assessment Tool(SWAT).

• 터널과지하공간
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• 제16권1호
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• pp.38-49
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• 2006

복공식 LNG 지하저장기지 건설을 위해서는 암반역학, 열역학 및 수리지질특성과 관련된 여러 가지 기술이 요구되며, 이러한 기술의 적용성을 입증하기 위한 일환으로 대전에 Pilot cavern을 건설하였다. 이 논문에서는 Pilot cavern에 적용된 기술 중 배수시스템 평가과 Ice ring모사에 관한 수치해석 연구를 수행하였다. 대수층관점의 Modflow와 유동시스템 관점의 Seep/W 해석을 통해 적용된 배수시스템이 효율적으로 작용하였음을 확인하였다. Ice ring 형성은 열전달과 지하수 흐름의 상호작용을 통해 모사될 수 있는데, 이에 대한 모사를 위해 Temp/W-Seep/W 프로그램을 이용한 냉열수리 연동해석을 수행하였다. 이러한 해석을 통해 Ice ring의 형성 위치를 추정 할 수 있었고, Ice ring형성에 지하수 유동 속도 및 방향이 영향을 크게 미친다는 것을 확인했다.