누수대수층 지하수 양수에 따른 하천수 감소율 거동 분석 = Analysis of Stream Depletion Rate by Groundwater Abstraction in Leaky Aquifer

다국어 초록 (Multilingual Abstract)

This study was to evaluate the stream depletion rate from groundwater pumping with varying stream-well distance, aquifer transmissivity, storage coefficient, leakage coefficient, streambed hydraulic conductance using the Zlotnik and Tartakovsky analytical solution which considers a two-layer leaky aquifer-stream-well system. For the hydraulic conditions applied in this study, the streambed hydraulic conductance and the aquitard leakage coefficient were assessed to have a dominant influence on the stream depletion rate. In order to evaluate the applicability of Zlotnik and Tartakovsky analytical solution ignoring the change in the drawdown in the lower aquifer and applying the fixed head boundary condition, the solution was compared with Hunt analytical solution derived from the more practical conditions simultaneously taking into account the drawdown changes in the upper and lower aquifers. As a result, the Zlotnik and Tartakovsky analytical solution is suitable for predicting short-term effects of less than one yearin the pumping period, and when the stream depletion factor (SDF) is greater than 2,500 days, or when the product of the leakage coefficient and the stream-well distance is less than 10 cm/s.

국문 초록 (Abstract)

누수대수층-하천-양수정 경계치 문제에 관한 Zlotnik and Tartakovsky 해석해를 이용하여 하천-관정 이격거리, 대수층의 투수량계수 및 저류계수, 누수층의 누수계수, 하상의 수리전도성 값의 다양한 조합에 대해 지하수 양수로 인한 하천수 감소율을 산정하고 그 변동 특성을 분석하였다. 본 연구에서 적용한 수리조건에 대해서는 하상수리전도성과 반대수층 누수계수가 하천수 감소율 크기에 지배적인 영향을 미치는 것으로 평가되었다. 하부대수층의 수위변화를 무시하고 고정수두 경계조건을 부여한 Zlotnik and Tartakovsky 해석해의 적용성을 평가하기 위해서 상하부 대수층의 수위변화를 동시에 고려한 보다 실제적인 조건에 대해 유도된 Hunt 해석해와 비교하였다. 그 결과 Zlotnik and Tartakovsky 해석해는 양수기간 1년 이하의 단기간 영향을 예측하는데 적절하며, 하천고갈지수가 2,500일 보다 크거나 누수계수와 하천-관정이격거리의 곱이10cm/s 미만인 경우에 적용하는 것이 바람직한 것으로 분석되었다.

참고문헌 (Reference)

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