Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Calibration of Water Quality Parameters in SWAT Considering Continuous Drought Periods 2014~2015

2014~2015 연속가뭄을 고려한 SWAT 수질 매개변수 보정

  • 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)
  • Received : 2017.07.26
  • Accepted : 2017.11.13
  • Published : 2018.01.31
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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

References

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