• 한국수자원학회논문집
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• 제33권1호
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• pp.51-59
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• 2000

시계열모형과 시차분포모형을 결합한 동적모형을 이용하여 강우량과 지하수위의 관계를 파악하였다. 시차에 따른 현재 및 과거 강우량과 과거 지하수위를 독립변수로 하여 동적모형을 구성하였다. 지하수위에 미치는 시차에 다른 강우량의 영향을 Almon 다항식으로 분포시켜 시차분포모형의 매개변수를 추정하였다. IHP 대표유역의 방림과 탄부의 지하수위관측소에서 적용된 동적모형은 강우량에 따른 지하수위를 매우 잘 재현해 주고 있으며, 지하 수위의 예측에도 이용할 수 있음을 확인하였다. 또한 모형의 매개변수는 대수층의 지질특성을 반영하고 있다. 지하수위는 1일전 강우량과 가장 큰 연관성이 있으며, 방림의 경우 18mm/일, 탄부의 경우 30mm/일 이하의 강우량에서는 지하수위의 변동에 큰 영향이 없었다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.1398-1402
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• 2005

Riverbank filtration is a natural process using alluvial aquifers to remove contaminants and pathogens in river water for the production of drinking water. In riverbank filtration, the understanding of contaminant transport is an important task for the production of high quality drinking water. This study investigates the transport behavior of hydrophobic organic contaminants when colloids (dissolved organic matter and bacteria) are present in the aquifer. A mathematical model for the transport of contaminants is developed and solved numerically for various situations. Results show that in the riverbank filtration the presence of DOM and bacteria enhances the mobility of contaminant significantly. Sensitivity analysis indicates that the distribution of the total aqueous Phase contaminant is significantly affected by distribution coefficients which account for affinity of solid or colloidal Phase to contaminant.

• Journal of applied mathematics & informatics
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• 제9권2호
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• pp.561-577
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• 2002

In this paper, a two-dimensional finite volume unstructured mesh method (FVUM) based on a triangular background interpolation mesh is developed for analysing the evolution of the saltwater intrusion into single and multiple coastal aquifer systems. The model formulation consists of a ground-water flow equation and a salt transport equation. These coupled and non-linear partial differential equations are transformed by FVUM into a system of differential/algebraic equations, which is solved using backward differentiation formulas of order one through five. Simulation results are compared with previously published solutions where good agreement is observed.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.20-23
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• 2006

Geothermal energy is the natural heat of the Earth. Enormous amounts of thermal energy are continuously generated by the decay of radioactive isotopes of underground rocks and stored in the Earth's interior. Therefore, geothermal energy is one of the most important sustainable energy resources. Recent trends of geothermal energy exploitation technologies focus on the Earth scientific approach to geothermal heat pump system, enhanced geothermal system, aquifer thermal energy storage, underground thermal energy storage, and fluid/heat flow model ing for geothermal wells. Geothermal heat pump distribution in Korea is still in its starting phase in terms of areal utilization sense, we, however, expect to come up with national supply of over 1,000,000 toe by 2020

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 추계학술발표회
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• pp.326-329
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• 2003

When an electrokinetic process is applied to a HOC-contaminated soil, hybrid types combined with soil flushing, chemical oxidation, and bioremediation are generally used. Especially when the electrokinetic process is combined with bioremediation, the hybrid technology can solve several limits of bioremediation such as low microbial mobility, low soil temperature, and shortage of nutrients in subsurface circumstance. Because microbial surface is charged negatively, the microorganism moves from cathode to anode under electrical field. In this study, mixed culture mainly-consisted by Pseudomonas sp. was applied to remediate pentadecane-contaminated kaolinite with particle size less than 300${\mu}{\textrm}{m}$. This remediation system was named ‘electrokinetic bioaugmentation’ and consisted of model aquifer, electrode reservoirs, bioreactor, power supply, and pump. The mixed culture above 0.5 of optical density in bioreactor was supplied to two reservoirs and penetrated soil when the electric current was applied. To enhance the removal efficiency, the optimal medium composition, electric current, and voltage were investigated.

• 한국환경과학회지
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• 제23권4호
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• pp.615-623
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• 2014

The groundwater level varies according to the characteristics and composite materials of aquifer. In this study, specific yield and reaction factor which are the major two hydrogeological parameters in the WTF(Water Table Fluctuation) method were estimated and analyzed spatial characteristics. 8 groundwater level stations which have enough measuring period and high correlation with rainfall in the Hancheon watershed were used. The results showed that specific yield was randomly distributed and reaction factor showed inverse trend with altitude. If the enough data were collected, reaction factor according to altitude in ungauged points could be estimated by using these parameter characteristics.

• 지질공학
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• 제14권3호
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• pp.287-300
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• 2004

Visual Modflow를 이용하여 터널 굴착 시 터널 내 지하수 유입 량과 영항반경에 영향을 미치는 수리 인자들에 대한 민감도 분석을 수행하였다. 터널의 심도 및 수리전도도의 민감도가 가장 크게 나타났으며, 굴착 후 경과 시간에 따라 민감도의 순위가 달라지는 것으로 분석되었다. 비산출률의 경우 굴착 후 시간이 경과함에 따라 민감도가 지속적으로 증가하는 것으로 나타나 배수형 터널 설계 시 수리전도도와 함께 중요하게 고려되어야 할 변수인 것으로 밝혀졌다. 터널굴착 및 방수 처리 과정을 모사할 수 있는 부정류 모델링 기법을 제시하였으며, 실제 터널 설계 지역에 적용하여 굴착과정에서 발생하는 터널 내 지하수 유입량 주변 지역 지하수계의 변화를 예측하였다. 예측 모델의 결과는 모델 보정을 통하여 설정한 수리 전도도에 매우 민감하므로, 사후 모니터 링을 통한 모델 검증이 요구된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권3호
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• pp.39-48
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• 2012

Visual MODFLOW, a three dimensional groundwater flow model, was used to analyze effects of a weir construction in an alluvial stream on the nearby groundwater flow system. A hypothetical conceptual model was developed to investigate how the groundwater level and the water budget could change after a weir construction depending on the location of tributary streams. A site example, dealing with the Juksan weir installed in the Yeongsan River, was also demonstrated to predict the effects of the weir construction. Model results show that impacts of a weir construction on the groundwater flow system greatly vary depending on how far a tributary is located and whether it is located downstream or upstream from the weir. Therefore, consideration of the location of tributaries in planning the location of a weir could effectively minimize the impacts of a weir construction on the groundwater flow system. It is also demonstrated that model results are highly dependent upon how the model is dealing with small tributaries and agricultural drainage channels, which can be easily found nearby the main streams, acting as major water bodies for groundwater discharge. The model for the Juksan area shows that the weir construction will change the direction of groundwater flow in some areas, leading to changes of groundwater quality and interaction of the Yeongsan River to the aquifer from a gaining to a losing stream. The model also predicted the areas where rise of groundwater level caused by the Juksan weir could adversely affect plant growth, and thereby suggested installing new drainage channels as a countermeasure to drawdown the groundwater level.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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• pp.114-118
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• 2004

울산지역의 대수층 분포특성과 지하수 유동특성에 관해 연구하기 위해 크리깅 기법을 이용하였다. 울산지역의 시추자료 1,783개 지점과 지하수위자료 총 1,171개 지점에 대하여 2년간(2002년～2003) 자료를 획득하여 분석하였다. 본 연구지역의 표고 충적층 하부경계 심도, 충적층, 하부경계 심도, 충적층 층후, 풍화대 층후, 충적층-풍화대 층후, 대수층 단면, 지하수위 그리고 지하수유동 분석을 하기 위해 베리오그램 분석한 결과 풍화대 하부경계 심도에 지수형모델(exponential model), 나머지 지하수위를 포함한 성분들은 모두 구상형모델(shperical model)이 가장 적합하게 나타났다. 울산지역 대수층의 경우 산악지역은 얕은 충적층과 풍화대 분포가 나타나는 반면, 남구는 충적층, 북구는 풍화대 발달이 우세하게 나타났다. 그리고 울산지역의 충적층과 풍화대 층후 분포특성이 울산단층을 따라 층후가 두껍게 나타났다. 지하수 유동은 고지형의 북구와 동구 산악지역에서 바다에 인접한 내륙지역으로 지하수 유동특성을 보였으며, 울산의 4개구는 산악지역, 태화강, 동천강, 울산단층 그리고 충적층과 풍화대가 잘 발달된 대수층을 따라 지하수유동 특성이 잘 나타났다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제18권3호
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• pp.11-22
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• 2013

SEAWAT, a linked modeling program of Visual MODFLOW was used to analyze the change in groundwater levels and salinity related groundwater dam construction in Cheongsan island, Wando-Gun, Jeollanam-Do. The steady-state model results show the groundwater flow and salinity distribution of the studied area. The groundwater flows from north-west and south-east highlands into the river, located in the middle part of the basin, and is eventually discharged to the ocean. Part of the sea water infiltrates into the river; and through the estuary's alluvium aquifer, the sea water intrusion takes place spreading to about 830 m from the ocean. The transient model results show that after the groundwater dam construction, groundwater levels will rise to a maximum of 2.0 m upstream, and the groundwater storage will increase 21,000 after 10 years. Meanwhile 31% of the total area affected by sea water intrusion will decrease. To conclude, the groundwater dam is a very useful method for a secure water resource in preparation for drought and water shortages in the island regions.