Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Pollutant Delivery Ratio of Okdong-cheon Watershed Using HSPF Model

HSPF 모형을 이용한 옥동천 유역의 유달율 분석

  • Lee, Hyunji (Department of Rural Systems Engineering, Seoul National University) ;
  • Kim, Kyeung (Department of Rural Systems Engineering, Seoul National University) ;
  • Song, Jung-Hun (Department of Agricultural and Biological Engineering & Tropical Research and Education Center, University of Florida) ;
  • Lee, Do Gil (Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Rhee, Han-pil (ETWATERS Inc.) ;
  • Kang, Moon Seong (Department of Rural Systems Engineering, Research Institute of Agriculture and Life Sciences, Institute of Green Bio Science and Technology, Seoul National University)
  • Received : 2018.07.02
  • Accepted : 2018.10.16
  • Published : 2019.01.31
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Abstract

The primary objective of this study was to analyze the delivery ratio using Hydrological Simulation Program - Fortran (HSPF) in Okdong-cheon watershed. Model parameters related to hydrology and water quality were calibrated and validated by comparing model predictions with the 8-day interval filed data collected for ten years from the Korea Ministry of Environment. The results indicated that hydrology and water quality parameters appeared to be reasonably comparable to the field data. The pollutant delivery loads of the watershed in 2015 were simulated using the HSPF model. The delivery ratios of each subwatershed were also estimated by the simple ratio calculation of pollutant discharge load and pollutant delivery load. Coefficients of the regression equation between the delivery ratio and specific discharge were also computed using the delivery ratio. Based on the results, multiple regression analysis was performed using the discharge and the physical characteristics of the subwatershed such as the area. The equation of delivery ratio derived in this study is only for the Okdong-cheon watershed, so the larger studies are needed to apply the findings to other watersheds.

Keywords

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Fig. 1 Location of the study watershed

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Fig. 2 The DEM for the study watersheds

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Fig. 3 The land cover for the study watersheds

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Fig. 4 Comparison of the observed with the simulated runoff and water qualities for the calibration period

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Fig. 5 Comparison of the observed with the simulated runoff and water qualities for the validation period

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Fig. 6 Scatter plots of the observed and simulated runoff and water qualities

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Fig. 7 Relationship between (Q/A) and DR at study watershed

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Fig. 8 Relationship between DR and DR_MR at study watershed

Table 1 Land use of the study watershed

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Table 2 Weather input data of HSPF model

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Table 3 Calibrated parameter values for the HSPF model simulation

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Table 4 Statistics of the HSPF model performances for calibration and validation period

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Table 5 Delivery Ratio using HSPF

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Table 6 Regression coefficients of multi-regression analysis using MATLAB

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Table 7 Result of multi-regression analysis using MATLAB

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