Evaluating Calibration Methods of Stream Flow for Water Quality Management

수질학적 관점에서의 수문모델 유출량 보정 방법 평가

  • Jeon, Ji-Hong (Department of Environmental Engineering, Andong National University) ;
  • Choi, Donghyuk (Department of Environmental Engineering, Andong National University) ;
  • Kim, Jung-Jin (Department of Environmental Engineering, Andong National University) ;
  • Kim, Taedong (Department of Environmental Engineering, Andong National University)
  • 전지홍 (국립안동대학교 환경공학과) ;
  • 최동혁 (국립안동대학교 환경공학과) ;
  • 김정진 (국립안동대학교 환경공학과) ;
  • 김태동 (국립안동대학교 환경공학과)
  • Received : 2008.10.06
  • Accepted : 2009.04.15
  • Published : 2009.05.30

Abstract

The effect of selecting hydrologic item for calculating objective function on calibration of stream flow was evaluated by Hydrologic Simulation Porgram-Fortran (HSPF) linked with Model Independent Parameter Optimizer (PEST). Daily and monthly stream flow and flow duration were used to calculate objective function. Automated calibration focused on monthly stream was proper to analyze seasonal or yearly water budget but not proper to predict daily stream flow or percent chance flow exceeded. Calibration result focused on flow duration is proper to predict precent chance flow exceeded but not proper to analyze water budget or predict peak flow. These results indicate that hydrologic item calculated for objective function on calibration procedure could influence calibration results and watershed modeler should select carefully hydrologic item for the purpose of model application. Current, the criteria of stream flow of Korean TMDL is generated based on percent chance flow exceeded, so flow duration should be included to calculate objective function on calibration procedure for the estimation of criteria of stream flow using hydrologic model.

Keywords

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