Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Assessment of Ecological Streamflow for Maintaining Good Ecological Water Environment

수생태 환경유지를 위한 하천생태유량 산정

  • Jung, Chung-Gil (Konkuk university, Department of Civil, Environmental and Plant Engineering) ;
  • Lee, Ji-Wan (Konkuk university, Department of Civil, Environmental and Plant Engineering) ;
  • Ahn, So-Ra (Konkuk university, Department of Civil, Environmental and Plant Engineering) ;
  • Hwang, Soon-Jin (Konkuk university, Department of Environmental Engineering) ;
  • Kim, Seong-Joon (Konkuk university, Department of Civil, Environmental and Plant Engineering)
  • Received : 2016.01.07
  • Accepted : 2016.04.11
  • Published : 2016.05.31
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Abstract

The objective of this study is to analyze the relationship between stream water quality of TN (total nitrogen), TP (total phosphorus), and BOD (Biochemical Oxygen Demand) and TDI (Trophic Diatom Index) score determined by physico-chemical factors, biomass, and standing crops of epilithic diatoms, and to estimate the required amount of ecological streamflow for good water environment of Trophic Diatom. For the main stream of Chungju dam watershed of South Korea, total 100 field data of 3 years (2008~2010) measured in May and September were used to derive the relationship between water quality and TDI. Trophic Diatom had high correlation (0.55 determination coefficient) with TN. Using the relationship, the required streamflow was evaluated by using the Soil Water Assessment Tool (SWAT) for good Trophic Diatom water environment through T-N water quality maintenance. The SWAT simulated 8 years (2003~2010) stream discharges and T-N water quality along the main stream. From present garde C (score range: 30.0~45.0) to grade A (score above 60.0) of TDI, the May needs additional streamflow of $63.1m^3/sec$ (+36.7 % comparing with the present streamflow of $172.0m^3/sec$) at the watershed outlet.

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References

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