Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Simultaneous evaluation of distribution characteristics of hydraulic parameters and groundwater contaminants estimated by a short-term pumping

단기양수를 통한 수리상수 및 지하수 오염물질 분포특성 동시평가

  • Published : 2013.04.30
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Abstract

Trichloroethylene (TCE) is one of the most frequently occurring contaminants in groundwater of urban and industrial areas. In this study, we evaluated the distribution of hydraulic parameters from a short-term (24 hours) pumping and that of contaminants using TCE concentrations at the pumping and monitoring wells during and after the pumping in a TCE contaminated aquifer. The changes in TCE concentrations at the wells were classified into 1) partly decrease during pumping and increase after pumping stop, 2) sustained like the initial values and 3) decrease during and after the pumping. These different behaviors at each well can be attributed to existence of high or low concentration plumes at nearby areas. Especially, the distinct increasing trends of TCE concentrations in the right region of the study area require an additional investigation for its outer region. In the meanwhile, hydraulic conductivities estimated the pumping results revealed neither significant difference with the analysis methods nor distinctive anisotropy. This study is meaningful because we have simultaneously evaluated both the distributions of the hydraulic parameters and the contaminants using the single short-term pumping.

삼염화에틸렌(TCE)은 도시 및 산업지역 지하수에서 가장 흔히 발견되는 오염물질 중의 하나이다. 본 연구에서는 삼염화에틸렌으로 오염된 대수층에서 24시간의 단기양수를 통해 수리상수의 분포를 평가하고 또한 양수 및 양수중단 후 양수정 및 관측정의 TCE 농도변화를 통해 오염물질의 분포특성을 평가하였다. 양수정과 관측정의 TCE 농도변화는 양수 시 농도가 일부 감소하였다가 이후 증가하거나, 혹은 초기와 비슷하게 유지되거나 혹은 감소하는 경향으로 대별되었다. 이는 이들 각 관정 인근에 고농도 오염운 혹은 저농도 오염운의 존재여부에 따라 다르게 나타난 것이다. 특히 본 구역의 우측에서 양수에 따른 TCE 농도 증가현상이 뚜렷하므로 이들 외곽부에 대한 추가적인 조사가 필요하다. 한편 본 양수를 통해 추정한 수리전도도를 보면 해석 방법론에 따른 차이는 적었으며 또한 특이적 이방성은 발견되지 않았다. 본 연구는 단일 단기양수를 통해 주변 오염분포의 평가 및 수리상수 추정 등 두 가지를 모두 수행하였다는데 의의가 있다.

Keywords

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