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Research Article

Relationship between Groundwater Level Changes and Aquifer Characteristics during Pumping at a Radial Collector Well

방사형 집수정 취수시 대수층 특성에 따른 지하수위의 변화

Myoung-Rak Choi1
,
Ho-Jeong Lee1
,
Gyoo-Bum Kim2*
최 명락1
,
이 호정1
,
김 규범2*
1Master Student, Department of Construction Safety and Disaster Prevention, Daejeon University
2Associate Professor, Department of Construction Safety and Disaster Prevention, Daejeon University
1대전대학교 건설안전방재공학과 석사과정
2대전대학교 건설안전방재공학과 부교수
*Corresponding Author
30 September 2019. pp. 279-288
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Abstract

The groundwater drawdown at each monitoring well near a radial collector well along Anseong Stream, Korea, was measured and compared with the calculated drawdown using the mirror well concept. The drawdown calculation is performed by treating the collector well as a large vertical well in a homogeneous isotropic aquifer. The measured drawdown at each monitoring well is slightly different from the calculated value due to anisotropy in the hydraulic conductivity and aquifer thickness. The difference between the measured and calculated values at Well OW-7 is large, reaching approximately 48 cm, because a horizontal well is not installed along this direction. Sensitivity analysis of the hydraulic conductivity and aquifer thickness indicates that the hydraulic conductivity is more sensitive to groundwater level changes. Groundwater level changes become a concern when a radial collector well with a large pumping rate capacity is installed, which highlights the need to thoroughly investigate the aquifer characteristics in the surrounding area.

Keywords
radial collector well
groundwater level
hydraulic conductivity

본 연구는 안성천에 설치된 방사형집수정에서 약 4,000 m3/d의 취수시 주변지역에서의 지하수위 강하량을 측정하였으며, mirror well 개념을 적용하여 계산된 지하수위 강하량과 비교 분석하였다. 지하수위 강하량의 계산은 방사형집수정을 균질 등방성 매질내의 대형 수직정으로 고려하여 실시하였다. 양수시 각 관측정에서 측정된 지하수위 강하량은 계산된 값과 약간의 오차가 발생하는데, 이는 수리전도도 및 대수층 두께 등의 이방성 때문으로 보인다. 또한, OW-7 지점은 실측 및 계산 지하수위 강하량의 차이가 약 48 cm로 크게 나타났는데, 이는 이 방향으로의 수평집수관이 설치되지 않았기 때문이다. 연구지역내에서 출현 가능한 수리전도도와 대수층 두께를 고려한 지하수위 변화의 민감도를 분석한 결과, 대수층의 두께보다는 수리전도도가 지하수위 변화에 민감하게 작용하는 것으로 나타났다. 대용량 취수 시설인 방사형 집수정의 개발시에는 배후지 수위 강하에 대한 우려가 존재하게 되므로 주변지역에 대한 대수층 특성을 정밀하게 파악하여 지하수위 변화를 예측, 평가할 필요가 있다.

키워드
방사형집수정
지하수위
수리전도도
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 29
  • No :3
  • Pages :279-288
  • Received Date : 2019-08-27
  • Accepted Date : 2019-09-09
  • DOI :https://doi.org/10.9720/kseg.2019.3.279
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