Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Operational Water Quality Forecast for the Nakdong River Basin Using HSPF Watershed Model

HSPF 유역모델을 이용한 낙동강유역 수질 예측

  • Shin, Chang Min (Water Quality Assessment Research Division, National Institute of Environment Research) ;
  • Kim, Kyunghyun (Water Quality Assessment Research Division, National Institute of Environment Research)
  • 신창민 (국립환경과학원 물환경연구부 물환경평가연구과) ;
  • 김경현 (국립환경과학원 물환경연구부 물환경평가연구과)
  • Received : 2016.11.07
  • Accepted : 2016.11.29
  • Published : 2016.11.30
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Abstract

A watershed model was constructed using the Hydrological Simulation Program Fortran to predict the water quality, especially chlorophyll-a concentraion, at major tributaries of the Nakdong River basin, Korea. The BOD export loads for each land use in HSPF model were estimated at $1.47{\sim}8.64kg/km^2/day$; these values were similar to the domestic monitoring export loads. The T-N and T-P export loads were estimated at $0.618{\sim}3.942kg/km^2/day$ and $0.047{\sim}0.246kg/km^2/day$, slightly less than the domestic monitoring data but within the range of foreign literature values. The model was calibrated at major tributaries for a three-year period (2008 to 2010). The deviation values ranged from -31.5~1.6% of chlorophyll-a, -24.0~2.2% of T-N, and -5.7~34.8% of T-P. The root mean square error (RMSE) ranged from 4.3~44.4 ug/L for chlorophyll-a, -0.6~1.5 mg/L for T-N, and 0.04~0.18 mg/L for T-P, which indicates good calibration results. The operational water quality forecasting results for chlorophyll-a presented in this study were in good agreement with measured data and had an accuracy similar with model calibration results.

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References

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