• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.561-566
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• 2009

Alluvium is sedimentary stratum and composed of gravel, sand, silt, clay. Permeability of alluvium is the higher. If alluvium have lots of aquifer, will be of great use heat source and heat sink of heat pump. Alluvium aquifer contain the thermal energy of surrounding ground. Also geothermal heat pump using alluvium aquifer reduce expenses than general geothermal heat pump, because geothermal heat pump using alluvium aquifer make use of single well. In this study geothermal heat pump using alluvium aquifer was installed and tested for a building. The heat pump capacity is 30USRT. Temperature of ground water is in $12{\sim}17^{\circ}C$ annually and the quality of the water is as good as living water. The heat pump cooling COP is 4.4 ~ 4.7. The system cooling COP is 3.25 ~ 3.6. This performance is as good as BHE type ground source heat pump.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.171.1-171.1
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• 2010

Riverbank filtration wells have been developed to supply a heat source/sink of water in the alluvium aquifer to ground water heat pumps for cooling and heating of a green house. In order to look for an appropriate site to carry out the research, two sites of Jinju and Gumi areas were investigated. In the results of the electrical resistivity surveys, Jinju and Gumi areas have the alluvium aquifer in the depth of 6~17 m and 10~20 m under the ground respectively. Two boreholes have been drilled in each site of both areas. The averaged water level at Jinju site is about 3 m under the ground, and 3.5 m and 6.5 m of sandy gravel aquifer layers are existed in each site. While Gumi site has 10 m water level and 2.5 m and 4.6 m of sandy gravel aquifer. Therefore, it is expected that $1,000m^3$/day of water could be withdrawn at Jinju site rather than Gumi site.

• 지질공학
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• 제18권4호
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• pp.423-431
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• 2008

충적층의 구성물질 중에서 포화된 실트 또는 점토층은 다른 층들에 비해 상대적으로 낮은 전기비저항 값을 나타낸다. 따라서 자료해석에 있어서 실트 및 점토층이 전기비저항이 작고 투수성이 높은 대수층으로 오인될 수 있다. 본 연구에서는 이러한 문제를 극복하고 충적층 내 포화된 실트 또는 점토층과 모래 또는 자갈 대수층을 구분하기 위해 충적층을 구설하고 있는 물질의 전기비저항 및 유도분극 값을 함께 측정하는 실내실험을 실시하였다. 실험결과 실트 또는 점토시료가 모래시료보다 충전성이 높게 나타났으며, 또한 모래와 점토 혼합시료에서 점토함량이 증가함에 따라 전기비저항은 감소하고 충전성은 증가하다가 다시 감소하는 경향을 보였다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.287-291
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• 2003

To delineate the internal structures of alluvial aquifer, high resolution seismic and GPR methods were adopted in Buyeo Gunsu-Ri area. The result of seismic refraction survey shows the water table of the aquifer and the result of seismic reflection reveals the basement and somewhat dominant internal structures of alluvial aquifer. The internal heterogeneity due to variations in channel behavior can be delineated using GPR survey. GPR profiles for the point bar deposits near Buyeo county reveals two different stratigraphic units the lower inclined heterogeneous strata and the upper horizontally stratified strata. According to the increase of demand for water resource using artificial recharge in alluvium, it is believed that the information acquired by high resolution geophysical methods will have an important roles for the effective and sustainable development and usage of groundwater in alluvial aquifer.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2008년도 공동학술대회
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• pp.179-184
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• 2008

충적층 구성 물질 중 포화된 실트 혹은 점토층은 상대적으로 낮은 전기비저항 값을 나타낸다. 낮은 전기비저항 값은 이 지층을 투수성이 높은 대수층으로 오인하는 문제를 발생시킨다. 이러한 문제를 극복하고 충적층 내 포화된 실트 혹은 점토층과 모래 혹은 자갈 대수층을 구분하기 위해 전기비저항 조사와 함께 유도분극 조사를 활용하는 방안을 검토하였다. 본 연구에서는 우선, 실내 실험을 통해 충적층 구성 물질별 전기비저항(resistivity)과 충전성(chargeability)을 조사하였고, 비분극 전극을 활용한 현장 수직 전기비저항/유도분극 조사를 수행하였다. 실내 실험을 통해 모래/점토 혼합층에서 점토함량이 증가함에 따라 비저항은 낮아지고, 충전성은 높아짐을 확인하였다. 이러한 실험 결과를 바탕으로 강변여과 현장에서 전기비저항/유도분극 조사를 수행하였다. 자료의 정량적 해석을 통해, 낮은 비저항과 낮은 충전성을 갖는 지층이 상대적으로 투수성이 우수하고 지하수 산출성이 높은 충적 대수층에 해당되는 것으로 최종 해석하였다.

• 지질공학
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• 제7권2호
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• pp.139-149
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• 1997

전기비저항 모니터링을 이용하여 충적층 지하수위의 변동을 감지 할 수 있는지의 여부가 연구되었다. 연구는 유한요소법을 이용한 전기비저항 수치 모델링 시험과 20일간의 장기 양수 시험이 수행된 금강 정동리 지역의 현장 자료를 이용하여 수행되었다. 수치 모델링 시험 및 현장 자료 획득은 전극 기본 간격이 4m인 21개의 고정전극을 이용하였으며, 전극배열은 "변형 웨너 배열"과 쌍극자 배열을 이용하였다. 현장 장기 양수 시험에서 관측된 수위 변화를 단순화하여 지하 2차원 비저항 모델로 사용한 사용한 결과, 겉보기 전기비저항의 변화 양상은 수위 변화보다 둔감한 변화 양상을 보여 주며, 수위 변화가 있는 부분뿐만 아니라하부 결정질 기반암의 경계 부위에 해당하는 심도에서도 겉보기 비저항 장치가 변화하는 현상이 관측되었다. 이러한 수치 결과와 부합되는 결과가 실제 현장에서 획득된 겉보기 전기 비저항 단면에서도 나타났다. 수치 계산결과 및 현장 자료는 전기 비저한 모니터링이 지하수위 변동을 유무 감지하는데 유용하게 사용될 수 있음을 보여주었다. 그러나 겉보기 전기비저항 단면이 수위 변동량을 정량적으로 규명할 만큼의 뚜렷한 변화를 보여주지는 못하기 때문에 전기비저항 방법만으로 정략적인 수위변동을 감지하는데 한계가 있는 것으로 판단되었다. 이러한 지하 수위 변동량 등을 명확히 규명하기 위해서는 고해상도 탄성파 또는 지하레이다 탐사처럼 지하의 모습을 영상화 할 수 있는 지구물리 탐사법이 병행되는 것이 바람직하다.

• 한국유체기계학회 논문집
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• 제15권2호
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• pp.20-29
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• 2012

The green house on the waterfront is air-conditioned by a water-source heat pump system with riverbank filtration water. In order to supply riverbank filtration water in alluvium aquifer, the riverbank filtration facility for water intake and recharge, two pumping wells and one recharge well, has been constructed. The research site in Jinju, Korea was chosen as a good site for riverbank filtration water supply by the surface geological survey, electrical resistivity soundings, and borehole surveys. In the results of two boreholes drilling at the site, it was revealed that the groundwater table is about 3 m under the ground, and that the sandy gravel aquifer layer in the thickness of 6.5 m and 3.5 m occurs at 5 m and 7 m in depth below the ground level respectively. To prevent the recharge water from affecting the pumped water which might be used as heat source or sink, the distance between pumping and recharge wells is designed at least 70 m with a quarter of recharged flow rate. It is predicted that the transfer term, the recharge water affects the pumping well, is over 6 months of heating season. Hydrogeological simulation and underground water temperature measurement have been carried out for the pumping and recharge well positions in order to confirm the capability of sustainable green house heating and cooling.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
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• pp.263-266
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• 2002

The purpose of this study is to clarify the reasons of pipe corrosion and well clogging which are taken place in long term bank filtering and to establish countermeasure of them in the alluvium of Goryeong Gun, Dasan Myeon, Nakdong River It is believed that the scale inside the pipe is not caused by only iron hydroxides but compounds consisted with some carbonate and silicate minerals. For the removal of the scales, it is desirable to loosen the bonds of the scale itself by dissolving the carbonate and silicate minerals after detailed study of the scale compounds.

• 한국지하수토양환경학회지:지하수토양환경
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• 제21권1호
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• pp.61-71
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• 2016

Visual MODFLOW was used for quantifying stream-aquifer interactions caused by seasonal groundwater pumping. A hypothetical conceptual model was assumed to represent a stream-aquifer system commonly found in Korea. The model considered a two-layered aquifer with the upper alluvium and the lower bedrock and a stream showing seasonal water level fluctuations. Our results show that seasonal variation of the stream depletion rate (SDR) as well as the groundwater depletion depends on the stream depletion factor (SDF), which is determined by aquifer parameters and the distance from the pumping well to the stream. For pumping wells with large SDF, groundwater was considerably depleted for a long time of years and the streamflow decreased throughout the whole year. The impacts of return flow were also examined by recalculating SDR with an assumed ratio of immediate irrigation return flow to the stream. Return flow over 50% of pumping rate could increase the streamflow during the period of seasonal pumping. The model also showed that SDR was affected by both the conductance between the aquifer and the stream bed and screen depths of the pumping well. Our results can be used for preliminary assessment of water budget analysis aimed to plan an integrated management of water resources in riparian areas threatened by heavy pumping.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.201.2-201.2
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• 2011

A water-source heat pump system has been developed for cooling and heating of a green house on the waterfront in Jinju. In order to supply a heat source/sink of water in alluvium aquifer to the heat pump system, the riverbank filtration facility (two pumping wells and one recharge well) for water intake and injection has been constructed. To pump and recharge water sufficiently, the geometric design such as depth and diameter for the wells have been completed, and details of the well such as slot size and length of the screen and filter pack size have been designed based on the practical and theoretical design method including D30 technique. For the investigation of the hydrogeological characteristics, step-drawdown test, long-term pumping test, and recovery test have been carried out for two developed pumping wells. Step-drawdown test has been performed on 4 step flowrates of 150, 300, 450, $600m^3$/day for 1 hour, and long-term pumping test on flowrate of $500m^3$/day for 24 hours, and recovery test for 6 hours. Since the underground water filtrated by riverbank is flowing smoothly into the well, the water level goes down slightly for the long-term test. Consequently, the stable pumping flowrate for two pumping well has been predicted at least over $1,647m^3$/day which is larger than the flowrate of $1,000m^3$/day for a 60 RT heat pump system.