| Title |
Evaluation of Stream Depletion from Groundwater Pumping in Deep Aquifer Using An Analytical Model |
| Authors |
이정우(Lee, Jeongwoo) ; 정일문(Chung, Il-Moon) ; 김남원(Kim, Nam Won) |
| DOI |
https://doi.org/10.12652/Ksce.2016.36.5.0769 |
| Keywords |
지하수 양수;하천수 감소량;Ward and Lough 해석해;2층 누수대수층 시스템 Groundwater pumping;Stream depletion;Ward and Lough's analytical solution;Two-layer leaky aquifer |
| Abstract |
The objective of this study was to evaluate the stream depletion from groundwater pumping in deep aquifer using the Ward and Lough's analytical solution (2011) which considers a two-layer leaky aquifer system. The calculated results for each pumping from the 110 wells beside streams showed a wide range of non-dimensional stream depletion, that is the streamflow depletion rate divided by the groundwater pumping rate, from lower than 0.1 to more than 0.9 on average for 5 years depending on the specific properties of well location. From the comparison with Hunt's solution (1999) of a single layer aquifer, the Ward and Lough's solution showed about 50% lower than the Hunt's solution due to the difference of hydraulic properties between the first and second layers as well as the lagged effect of vertical leakance. It was also found that the groundwater pumping has a minor effect on the stream depletion if the stream depletion factor (SDF) of the 1st layer is higher than about 1,000 or the SDF of the 2nd layer is higher than about 100, or the vertical leakance is smaller than $10^{-5}s^{-1}$. Furthermore, in the present study, the variations of the stream depletion were assessed according to the magnitude of unmeasured hydraulic properties such as transmissivity and storage coefficient of the 1st layer, vertical hydraulic conductivity of the 2nd layer, the streambed hydraulic conductance. |