| Title |
Comparative Analysis of Shallow and Deep Groundwater Pumping Effects on Stream Depletion |
| Authors |
이정우(Lee, Jeongwoo) ; 정일문(Chung, Il-Moon) |
| DOI |
https://doi.org/10.12652/Ksce.2020.40.4.0383 |
| Keywords |
Hunt 해석해;Ward & Lough 해석해;천부지하수 양수;심부지하수 양수;하천수 감소량 Hunt's analytical solution;Ward and Lough's analytical solution;Shallow groundwater pumping;Deep groundwater pumping;Stream depletion |
| Abstract |
In this study, Hunt's analytical solution and Ward & Lough's analytical solution for two-layered leaky aquifer system were used to estimate stream depletions due to shallow and deep groundwater pumping, and their differences were compared. Depending on the combination of the separation distance between the stream and the well, the transmissivity and the storage coefficient of the aquifer, and the leakage coefficient between the upper and lower layers, the stream depletion, which is the amount of stream water reduction compared to the amount of groundwater pumping, for each of 45,000 cases was calculated for both shallow and deep groundwater pumping, and the differences were analyzed quantitatively. When the leakage coefficient was very small, with a value of 10-61/d, the difference in the average five-year stream depletion due to the pumping of shallow and deep groundwater showed a large deviation of up to 0.9 depending on the given hydraulic characteristics; this value exponentially decreased as the stream depletion factor (SDF) increased. This exponential relationship gradually weakened as the leakage coefficient increased due to interaction effects between layers, resulting in a small difference of up to 0.2 when the leakage coefficient reached 10-31/d. Under the condition of greater interlayer hydraulic connectivity, there was little influence of the depth of groundwater pumping on the stream water reduction. |