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Auto-calibration for the SWAT Model Hydrological Parameters Using Multi-objective Optimization Method

다중목적 최적화기 법을 이용한 SWAT 모형 수분매개변수의 자동보정

  • 김학관 (서울대학교 농업생명과학연구원) ;
  • 강문성 (서울대학교 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 박승우 (서울대학교 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 최지용 (한국환경.정책평가연구원) ;
  • 양희정 (국립환경과학원 한강물환경연구소)
  • Published : 2009.01.29

Abstract

The objective of this paper was to evaluate the auto-calibration with multi-objective optimization method to calibrate the parameters of the Soil and Water Assessment Tool (SWAT) model. The model was calibrated and validated by using nine years (1996-2004) of measured data for the 384-ha Baran reservoir subwatershed located in central Korea. Multi-objective optimization was performed for sixteen parameters related to runoff. The parameters were modified by the replacement or addition of an absolute change. The root mean square error (RMSE), relative mean absolute error (RMAE), Nash-Sutcliffe efficiency index (EI), determination coefficient ($R^2$) were used to evaluate the results of calibration and validation. The statistics of RMSE, RMAE, EI, and $R^2$ were 4.66 mm/day, 0.53 mm/day 0.86, and 0.89 for the calibration period and 3.98 mm/day, 0.51 mm/day, 0.83, and 0.84 for the validation period respectively. The statistical parameters indicated that the model provided a reasonable estimation of the runoff at the study watershed. This result was illustrated with a multi-objective optimization for the flow at an observation site within the Baran reservoir watershed.

Keywords

References

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