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Characteristics of Changes in Water Quality in the Suyoung River During Rainfall Event

강우 시 수영강 유역의 수질변화 특성

  • Kim, Suhyun (Department of Environmental Engineering, Pukyong National University) ;
  • Kim, Jungsun (Busan Development Institute) ;
  • Kang, Limseok (Department of Environmental Engineering, Pukyong National University)
  • 김수현 (부경대학교 환경공학과) ;
  • 김정선 (부산발전연구원 해양환경연구실) ;
  • 강임석 (부경대학교 환경공학과)
  • Received : 2018.09.07
  • Accepted : 2018.12.05
  • Published : 2019.01.30

Abstract

Recently, it was realized that a significant portion of pollution from urban areas originates from non-point sources such as construction sites, washoff from impervious surfaces, and sewage input from unsewered areas and combined sewer overflows. Especially, Urban stormwater runoff is one of the most extensive cause of the deterioration of the water quality in streams located in urban area. The objective of this study was to investigate runoff characteristics of non-point pollutants source at the urban area in the Suyeong River. Water quality variations were investigated at two points of Suyeong River during a period of 10 rainfall events. Concentration difference of non-point pollution source appeared big by precedent number of days of no rainfall. In addition, Event mean Concentration (EMCs) that well represents runoff characteristics of storm water during rainfall, was calculated, and runoff pollutants loading was also examined. The probability distribution of EMCs of BOD, COD, TOC, T-N, T-P, and TSS were analyzed and the mean values of observed EMC and the median values of estimated EMCs compared through probability distribution. Other objectives of this study were the characterization of discharge from non-point source, the analysis of the pollutant loads and an establishment of a management plan for non-point source of Suyeong River. Also, It was established that the most important thing for the administration of non-point pollution source is to come up with the solution for the reduction of effluent at the beginning.

Keywords

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Fig. 1. Sampling points for storm runoff in the Suyeong River.

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Fig. 2. Characteristics of flowrate according to precipitation type.

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Fig. 3. Flowrate variation with according to rainfall duration in the Suyeong River.

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Fig. 4. Changes of BOD, COD, and TOC concentration according to rainfall duration in the Suyeong River.

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Fig. 5. Changes of TN and TP concentration according to rainfall duration in the Suyeong River.

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Fig. 6. Changes of turbidity and TSS concentration according to rainfall duration in the Suyeong River.

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Fig. 7. Concentration of EMCs in the Suyeong River.

Table 1. Analytical methods and instruments

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Table 2. Results of water quality in the Suyeong River

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Table 3. Summary of the monitored rainfall events

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Table 4. Statistics of rainfall event at Suyeong River

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