| Title |
Estimation of Exploitable Groundwater in the Jinju Region by Using a Distributed Hydrologic Model |
| Authors |
이정은(Lee, Jeong Eun) ; 정일문(Chung, Il-Moon) ; 이정우(Lee, Jeongwoo) ; 김민규(Kim, Min Gyu) |
| DOI |
https://doi.org/10.12652/Ksce.2021.41.6.0655 |
| Keywords |
지하수 함양; SWAT; MODFLOW; 지하수 개발가능량; 빈도해석 Groundwater recharge; SWAT; MODFLOW; Exploitable groundwater; Frequency analysis |
| Abstract |
This study aimed to estimate exploitable groundwater for the sustainable supply of groundwater in the Jinju region of South Gyeongsang
Province. As an integrated hydrologic analysis model, SWAT-MODFLOW was used to estimate the distributed groundwater recharge in consideration of land use and soil distribution. As a result of calibration of the model, the coefficient of determination between the observed flow and the simulated flow was 0.75?0.80, which was good. The simulated groundwater recharge rate showed a spatio-temporal distribution due to heterogeneous watershed characteristics. The amount of groundwater recharge shows lower values over winter and spring, but it increases according to the pattern of precipitation in summer and autumn. The calculated average annual groundwater recharge was compared with the result using the baseflow separation method of natural flow, and the deviation of both results was small, within 3 %,
confirming the validity of the estimated groundwater recharge. Exploitable groundwater is defined as the amount of recharge corresponding to low flow with 10 years of return period. Therefore, in this study, 14.2 % of the annual precipitation was found to be exploitable as a result
of calculating the amount of recharge at a 10-year frequency using a statistical frequency analysis technique. |