지하수이용 증가에 따른 한강유역의 수문학적 영향 평가 = Assessment of the Increased Groundwater Use on Watershed Hydrology in the Han River Basin

다국어 초록 (Multilingual Abstract)

This study assessed the impact of increased groundwater use on watershed hydrology in Han River basin (35,770.4 km2) by applying groundwater usedata from the 1980s (1976-1985) and 2010s (2006-2015) to SWAT (Soil and Water Assessment Tool). The groundwater use data was established usinggroundwater survey yearbooks and applied to each subbasin using WUS tool of SWAT. SWAT was calibrated at 4 multi-purpose dams and 3multi-functional weirs under 2010s weather and groundwater use conditions. The average calibration results at 4 dams and 3 weirs showed that 0.76of R2, 0.68 of NSE, and 2.13 mm/day of RMSE, respectively. After, 1980s groundwater use data was applied to the calibrated SWAT under the sameweather conditions. The impact of increased groundwater use revealed a decrease in the average streamflow from 58.0 m3/sec to 55.1 m3/sec,representing an approximate 5.29% reduction. The total runoff (TR), baseflow (BF), and groundwater recharge (GWR) decreased by 2.5%, 20.6%, and20.7%, respectively. Seasonal analysis indicated that TR notably decreased during autumn and winter, while BF showed a maximum reduction of 25.6%during summer season.