Author(s): Sanghyun Park; Hyeonjun Kim; Cheolhee Jang; Dereje Birhanu
Linked Author(s):
Keywords: CAT; Water cycle; Runoff characteristics; Infiltration
Abstract: In this study, water cycle and runoff characteristics analysis are carried out using the Catchment Hydrologic Cycle Assessment tool (CAT). The CAT physically based semi-distributed hydrological model is applied in Boryeong-Dam watershed located in the Republic of Korea. More than 80% of the area of the watershed (163.7 km²) is covered by forest. The annual average precipitation is 1,244 mm and average temperature 12.4 °C. The result of the runoff simulation is compared considering rainfall excess, Green & Ampt, Horton infiltration methods and the Green & Ampt method was applied for this study, showing the most satisfactory results. Model calibration for Green & Ampt infiltration method was carried out manually considering the entire modeling period (1999-2017). The comparative assessment of yearly model performances is carried out considering the Nash-Sutcliffe efficiency (NSE) as basic objective function. The model performance shows a satisfactory result with NSE greater than 0.72 on average for the period. However, the model performance of 2001, 2008 and 2015 were observed to be less than 0.57. The less model performance is likely due to severe drought in those years. In general, the simulated discharge values tend to be similar, but minor underestimated values were detected compared with the observed discharge.
Year: 2018