Comparing groundwater recharge and base flow in the Bukmoongol small-forested watershed,Korea |
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Authors: | E A Combalicer S H Lee S Ahn D Y Kim S Im |
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Institution: | (1) Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul, 151-921, Korea;(2) College of Forestry, Nueva Vizcaya State University, 3700 Bayombong, Nueva Vizcaya, Philippines;(3) Department of Forest Sciences, Research Institute for Agriculture & Life Sciences, College of Agriculture and Life Sciences, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul, 151-921, Korea |
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Abstract: | Groundwater recharge and base flow using different investigated methods are simulated in the 15-ha Bukmoongol small-forested
watershed located at the southern part of Korea. The WHAT system, PART, RORA, PULSE, BFI, and RAP software are used to estimate
groundwater recharge or base flow and base flow index from the measured streamflow. Results show that about 15–31 per cent
of annual rainfall might be contributed for base flow. The watershed groundwater recharge proportions are computed to about
10–21 per cent during the wet period and 23–32 per cent for the remainder periods. Mean annual base flow indices vary from
0.25 to 0.76 estimated using different methods. However, the study found out that all methods were significantly correlated
with each other. The similarity of various methods is expressed as a weighted relationship provided by the matrix product
from the principal component analysis. Overall, the BFI and WHAT software appeared consistent in estimating recharge or base
flow, and base flow index under Korea’s conditions. The case study recommends the application of different models to other
watersheds as well as in low-lying areas where most observation groundwater wells are located with available streamflow data. |
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Keywords: | Base flow separation base flow index groundwater recharge WHAT |
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