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http://dx.doi.org/10.5389/KSAE.2018.60.1.011

Calibration of Water Quality Parameters in SWAT Considering Continuous Drought Periods 2014~2015  

Kim, Da Rae (Dept. of Civil, Environmental and Plant Engineering, Konkuk University)
Lee, Ji Wan (Dept. of Civil, Environmental and Plant Engineering, Konkuk University)
Jung, Chung Gil (Dept. of Civil, Environmental and Plant Engineering, Konkuk University)
Kim, Seong Joon (Dept. of Civil, Environmental and Plant Engineering, Konkuk University)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.60, no.1, 2018 , pp. 11-20 More about this Journal
Abstract
This study is to calibrate the SWAT (Soil and Water Assessment Tool) water quality of SS (Suspended Solid), T-P (Total Phosphorus), and T-N (Total Nitrogen) by focusing on 2014~2015 drought periods and identify the important parameters. For Gongdo watershed ($366.5km^2$), the SWAT was calibrated for 2 cases of 2002~2006 normal year focusing calibration and 2014~2015 drought focusing calibration respectively. The parameters of N_UPDIS (Nitrogen uptake distribution parameter) and CMN (Rate factor for humus mineralization of active organic nutrients) played important roles for T-N calibration during drought periods. The SWAT SS, T-N, and T-P average $R^2$ (Coefficient of determination) results by focusing on 2014~2015 drought periods calibration showed 0.71, 0.65 and 0.62 while 2002~2006 normal year focusing calibration showed 0.63, 0.58 and 0.50 respectively. Also SWAT SS, T-N, and T-P model efficiency NSE (Nash-Sutcliffe efficiency) results by focusing on drought period (2014~2015) calibrated showed 0.76, 0.77, 0.87 respectively. Even though the SS, T-P parameters were unchanged during the calibration, the SS and T-P results were improved by the hydrological parameters (SCS-CN, SOL_K, SLSOIL) during the drought periods. The SWAT water quality calibration needs to be considered for the movement of SS and nutrients transport especially focusing on the drought characteristics.
Keywords
Calibration; drought period; parameters; SWAT; watershed hydrology; water quality;
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