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Research Article

Measurement of Streambed Hydraulic Conductivity in Stream Sections in the Anseongcheon Watershed, Korea

안성천 수계 국가하천구간 하상 수리전도도 측정 시험

Seon-Keum Jeon1
,
Il Hoon Lee1
,
Jeongwoo Lee2*
,
Il-Moon Chung2
,
Sung Hun Hong3
전 선금1
,
이 일훈1
,
이 정우2*
,
정 일문2
,
홍 성훈3
1Geogreen21 company
2Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology
3Han River Flood Control Office
1주식회사 지오그린21
2한국건설기술연구원 수자원·하천연구소
3국토교통부 한강홍수통제소 수자원정보센터
* 교신저자* Corresponding Author
December 2017. pp. 377-382
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Abstract

Field experiments were conducted to estimate streambed hydraulic conductivity at 15 sites in the Anseongcheon watershed, Korea. Seepage meters and piezometers were installed in the streambed at each site to measure the amount of stream watergroundwater exchange and the hydraulic gradient. The vertical hydraulic conductivity was then calculated using Darcy’s formula. The measured stream water-groundwater exchange rates were 4.08 × 10−6 to 1.49 × 10−5 m/s, and the vertical hydraulic gradients were 0.005 to 0.145. The data suggest the streambed hydraulic conductivity to be 7.80 × 10−5 to 1.58 × 10−3 m/s. The results show significant differences in connectivity between stream and aquifer. Quantification of the hydraulic interconnection between stream and aquifer, and evaluation of the effects of groundwater development and utilization on the streamflow require hydrogeological investigations of the connection between stream and aquifer, including the hydraulic conductivity of the streambed. Various field testing and analysis methods for hydrogeological assessment also require further improvement.

Keywords
streambed hydraulic conductivity
stream-aquifer exchange rate
hydraulic gradient

안성천 수계 하류부 국가하천구간내 15개 지점에 대해 하상퇴적층의 수리전도도 측정 시험을 수행하였다. 각 지점별로 하상 퇴적층에 시피지미터와 피조미터를 설치하여 하천수-지하수 상호교환량과 수리경사를 측정하고 이를 Darcy 공식에 대입하여 연직방향 수리전도도를 산정하였다. 하천수-지하수 교환량은 4.08 × 10−6~1.49 × 10−5 m/s, 연직방향 수리경사는 0.005에서 0.145로 측정되었고, 하상수리전도도는 7.80 × 10−5~1.58 × 10−3 m/s로 산정되어 하천구간별, 지점별로 하천과 대수층간에 연결성의 큰 차이를 나타내었다. 하천과 대수층간의 수리적 상호연결성을 정량적으로 파악하고 지하수개발·이용이 하천수량에 미치는 영향을 평가하기 위해서는 하상퇴적층 수리전도도와 같이 하천과 대수층간 연결부의 수리지질학적 조사가 필요하며, 현장시험 및 분석 방법에 대한 기술적 향상이 이뤄져야 할 것이다.

키워드
하상퇴적층 수리전도도
하천수-지하수 상호교환량
수리경사
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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 : 27
  • No :4
  • Pages :377-382
  • Received Date : 2017-10-11
  • Revised Date : 2017-11-10
  • Accepted Date : 2017-11-14
  • DOI :https://doi.org/10.9720/kseg.2017.4.377
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