Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Forecasting of changes in the water quality in Sapgyo-Lake in accordance with implementation of Total Water Pollutant Load Management System

수질오염총량관리제 시행에 따른 삽교호의 수질변화 예측

  • Kim, Hongsu (Water Environment Research Center, Chungnam Institute) ;
  • Cho, Byunguk (Water Environment Research Center, Chungnam Institute) ;
  • Park, Sanghyun (Water Environment Research Center, Chungnam Institute) ;
  • Lee, Mukyu (Water Environment Research Center, Chungnam Institute) ;
  • Kim, Changgi (Water Environment Research Center, Chungnam Institute) ;
  • Choi, Jeongho (Water Environment Research Center, Chungnam Institute)
  • 김홍수 (충남연구원 물환경연구센터) ;
  • 조병욱 (충남연구원 물환경연구센터) ;
  • 박상현 (충남연구원 물환경연구센터) ;
  • 이무규 (충남연구원 물환경연구센터) ;
  • 김창기 (충남연구원 물환경연구센터) ;
  • 최정호 (충남연구원 물환경연구센터)
  • Received : 2019.03.18
  • Accepted : 2019.05.02
  • Published : 2019.05.30
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Abstract

Broadly speaking, in order to analyze the water quality improvement effects of the implementation of the Total Water Pollutant Management System in the Sapgy-Lake waterways, a reference was made to the [Plans for implementation of the Total Maximum Daily Load(TMDL)] in 3 cities (Cheonan, Asan, Dangjin). The results of the investigation into the plans to reduce the pollutant load show in that region show that there are plans to reduce pollution for a total of 16 reduction facilities. As for the result of the computation of the reduction in the load, these measurements were computed at the Gokgyo-stream basin and Namwon-stream basin, with BOD and T-P at the Gokgyo-stream basin reduced by 13.9 % and 13.3 %, respectively, while BOD and T-P at the Namwon-stream were reduced by 3.7 % and 3.3 %, respectively. In this way, thus using the results of the water quality forecast of Sapgyo-Lake in measures for the improvement of water quality (in accordance with the implementation of the TMDL), and using the QUAL-MEV model and EFDC model, it is noted that BOD will be improved by 26.4 % from 6.1 mg/L to 4.5 mg/L 0.0 %, T-P by 36.7 % from 0.168 mg/L to 0.107 mg/L and TOC by 26.4 % from 7.7 mg/L to 5.6 mg/L. However, it is forecasted that the targeted standards for the medium influence area will not be achieved. Evidently, Gokgyo-stream and Namwon-stream have been implementing the Total Water Pollutant Management System for the BOD items since January 1, 2019, but the Sapgyo-stream and Muhan-stream were excluded from being designated as subject regions. As such, it is noted now that it is necessary to implement the TMDL for the entire Sapgyo-Lake water systems including Sapgyo-stream and Muhan-stream in order to improve the water quality of Sapgyo-Lake, and likewise the T-P should be designated as the substance subjected to management in addition to BOD.

Keywords

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Fig. 1. Current status of Sapgyo-Lake basin.

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Fig. 2. Schematic diagram of the waterways of Sapgyo-Lake for mimicking of the water quality.

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Fig. 3. Changes in the water quality of Sapgyoh-Lake (2009 ~ 2018).

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Fig. 4. Water quality model Response coefficient by QUAL-MEV.

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Fig. 5. QUAL-MEV Results of Revision.

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Fig. 6. Water quality model Response coefficient by EFDC.

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Fig. 7. EFDC Results of Revision.

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Fig. 8. Results of forecast on the water quality of the streams.

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Fig. 9. Results of forecast on the water quality of Sapgyo-Lake.

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Fig. 10. Results of forecast on the water quality of streams in accordance with the reduction plan.

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Fig. 11. Results of forecast on the water quality in accordance with the implementation of TMDL.

Table 1. Total maximum daily load by Sapgyo-lake watershed

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Table 2. Si-Gun watered area

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Table 3. Current status and evaluation ratings for the water quality of Sapgyo-Lake

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Table 4. Results of computation of reference flow

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Table 5. QUAL-MEV Coefficient of water

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Table 6. QUAL-MEV Results of Revision

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Table 7. Water quality conversion coefficient by EFDC

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Table 8. Results of forecast for source

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Table 9. Results of forecast for load of pollutants(kg/day)

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Table 10. Results of forecast on the water quality of the streams

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Table 11. Results of forecast on the water quality of Sapgyo-Lake

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Table 12. Reduced load in accordance with the total pollutant load system(kg/day)

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Table 13. Results of forecast on the water quality of streams in accordance with the reduction plan

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Table 14. Results of forecast on the water quality in accordance with the implementation of TMDL

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