Comparing groundwater recharge and base flow in the Bukmoongol small-forested watershed, Korea

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.

Estimating Groundwater Recharge in the Semiarid Al-Khazir Gomal Basin, North Iraq

“…Therefore, the stable base-flow was applied to the four base-flow separation methods to avoid overestimation in base-flow records. Accordingly, the stable base-flow values were used to estimate the integrated net annual recharge after applying Equations (5) and (6), and the results were 131, 131, 122 and 119 mm/y for the local minimum method, single parameter digital filter, Eckhardt method and graphical method, respectively. The high value of recharge obtained by the displacement recession curve method (157 mm/y) results from the assumption inherent in this method.…”

“…Normally, groundwater discharge is approximately equal to recharge [5,6]. This assumption is justified if interflow, evapotranspiration from riparian areas, interaction with the underlying aquifer and neighboring basins and anthropogenic factors are thought to have a minimal effect.…”

“…Many researchers used several methods to estimate the contribution of groundwater to stream-flow through hydrograph analysis (e.g., [6][7][8]), and a useful review of the development of base-flow separation techniques was reported by Smakhtin [9]. Most of these studies describe the base-flow characteristics of streams, identify the regional differences in these flow characteristics and evaluate the interaction between surface and ground-water.…”

Model-based assessment of groundwater recharge in Slovenia

“…Classical approaches like the base flow method (Combalicher et al 2008;Seiler and Gat 2007) or water table fluctuation methods (Chung et al 2010) do not provide spatially distributed data within river basins and require dense monitoring networks. Their benefit can be regarded in supporting calibration and validation of models.…”

Estimation of flow components by recursive filters: case study of Paracatu River Basin (SF-7), Brazil

“…Notwithstanding, the filter mentioned by Lyne and Hollick (1979) was chosen because it is the most widely found in literature (Lim et al, 2005;Combalicer et al, 2008;Asmeron, 2008;Santhi et al, 2008;Albuquerque, 2009;Welderufael and Woyessa, 2010;Biller, 2010), making it easier to compare with other studies.…”