• Lee, Do-Hun (Department of Civil Engineering, Kyung Hee University) ;
  • Kim, Nam-Won (Water Resources Department., Korea Institute of Construction Technology) ;
  • Kim, In-Ho (Department of Civil Engineering, Dong Hae University)
  • Published : 2004.07.01


Soil and water assessment tool (SWAT) was simulated based on the default parameters and a priori soil parameter estimation method in Bocheong watershed of Korea. The performance of the model was tested against the measured daily runoff data for 5 years between 1993 and 1997. The sensitivity analysis of SWAT model parameters was conducted to identify the most sensitive model parameters affecting the model output. The results of SWAT simulation indicate that the overall performance of SWAT in calculating daily runoff is reasonably acceptable. However, there is a problem in estimating the low flow components of streamflow since the low flow components simulated by SWAT are significantly different from the measured low flow. The sensitivity analysis with SWAT points out that soil related parameters are the most sensitive parameters affecting surface and ground water balance components and groundwater flow related parameters exhibit negligible sensitivity.



  1. Arnold, J.G., and Allen, P.M. (1996). 'Estimating hydrologic budgets for three Illinois watersheds.' Journal of Hydrology, 176, pp. 57 - 77
  2. Arnold, J.G., Srinivasan, R., Muttiah, R.S., and Williams, J.R. (1998). 'Large area hydrologic modeling and assessment part I: model development.' Journal of American Water Resources Association, 34(1), pp. 73-89
  3. Arnold, J.G., Srinivasan, R., Muttiah, R.S., Allen, P.M. and Walker, C. (1999). 'Continental scale simulation of the hydrologic balance.' Journal of the American Water Resources Association, 35(5), pp. 1037-1052
  4. Arnold, J.G., Srinivasan, R., Muttiah, R.S., Allen, P.M. (2000). 'Regional estimation of base flow and groundwater recharge in the Upper Mississippi river basin.' Journal of Hydrology, 227, pp. 21 - 40
  5. Eckhardt, K. and Arnold, J.G. (2001). 'Automatic calibration of a distributed catchment model.' Journal of Hydrology, 251, pp. 103-109
  6. Kang, M.S. and Park, S.W. (2003). 'Development and application of total maximum daily loads simulation system using nonpoint source pollution model.' Journal of Korea Water Resources Association, 36(1), pp. 117-128 (In Korean)
  7. Lenhart, T., Eckhardt, K., Fohrer, N., and Frede, H.G. (2002). 'Comparison of two different approaches of sensitivity analysis.' Physics and Chemistry of the Earth, 27, pp. 645-654
  8. Nash, J. E. and Sutcliffe, J. V. (1970). 'River flow forecasting through conceptual models. Part I-A Discussion on principles', Journal of Hydrology, 10, 282-290
  9. Neitsch, S.L., Arnold, J.G., Kiniry, J.R., Williams, J.R. (2001) Soil and Water Assessment Tool Theoretical Documentation Version 2000. Agricultural Research Service. Texas Agricultural Experiment Station. Temple, Texas