지질공학 (The Journal of Engineering Geology)

  • 제27권4호
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  • Pages.439-449
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  • 2017
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
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지층 및 이화학 특성을 고려한 방사형 집수정의 취수량 감소 원인 분석

Cause of Groundwater Yield Reduction in a Collector Well Considering Sediment's Composition and Hydrogeochemical Characteristics

  • 투고 : 2017.11.20
  • 심사 : 2017.12.15
  • 발행 : 2017.12.30
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초록

경기도 안성천 유역에 설치된 강변여과수 시설의 취수량 감소 원인에 대하여 4개 수평정(1, 4, 6, 7번) 주변의 대수층 매질 특성, 수리전도도의 분포 등을 토대로 검토하였다. 시험 양수 기간 동안 1번 수평정은 $12.4m^3/d/d$, 4번은 $2.3m^3/d/d$, 6번은 $24.4m^3/d/d$, 7번은 $187.3m^3/d/d$의 경향으로 7번 수평정의 취수량 감소가 뚜렷하였다. 7번 수평정 주변은 국지적으로 수리전도도가 매우 낮은 구간이 존재하며, 전체적으로 균등 계수가 크고 수평 깊이별로 균등계수의 차이가 심하여 세립분의 이동에 의한 공극 막힘이 발생한 것으로 평가된다. 또한, 철 이온($Fe^{2+}$) 농도가 높아 양수 및 주입시 철산화물이 형성되면서 clogging을 야기하는 것으로 보인다. 향후 장기 양수 과정에서 대수층의 물리특성 및 수질 특성 변화를 분석한다면 취수량 감소에 대한 정확한 원인 규명이 가능할 것이다.

The cause of yield reduction in a collector well, which is located in Anseong-cheon watershed in Kyunggi province, is studied by using aquifer sediments' composition and hydraulic conductivity near four horizontal wells, no. 1, no. 4, no. 6, and no. 7 wells. During test-pumping periods, groundwater yield is reduced with a trend of $12.4m^3/d/d$ at no. 1, $2.3m^3/d/d$ at no. 4, $24.4m^3/d/d$ at no. 6, and $187.3m^3/d/d$ at no. 7 and no. 7 well shows the biggest reduction. The sediments along no. 7 horizontal well have low hydraulic conductivity and high coefficient of uniformity ($C_u$), and a deviation of $C_u$ along the well is also large. This characteristics can bring the fine particles' movement and make the openings filled. Additionally, high iron ($Fe^{2+}$) content results in a precipitation of iron hydroxides during pumping or injection and they can produce a clogging in sediments. In the future study, the analysis of physical and hydrochemical changes through a long-term pumping procedure will give a more exact interpretation for the cause of yield reduction.

키워드

참고문헌

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