Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analysis of Pollution Characteristics in the Mainstream and Its Tributaries of Gongneung Stream Using Water Quality Index and Pollution Load Data

통합수질지수 및 오염부하자료를 이용한 공릉천 유입지천과 본류의 오염특성 분석

  • Yu, Jae-Hyun (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Lee, Han-Saem (Department of Environmental Energy Engineering, Seoul National University of Science and Technology) ;
  • Lim, Byung-Ran (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kang, Joo-Hyoung (Environmental Preservation Association) ;
  • Ahn, Tae-Ung (Environment Solution Partners) ;
  • Shin, Hyun-Sang (Department of Environmental Engineering, Seoul National University of Science and Technology)
  • 유재현 (서울과학기술대학교 환경공학과) ;
  • 이한샘 (서울과학기술대학교 에너지환경공학과) ;
  • 임병란 (서울과학기술대학교 환경공학과) ;
  • 강주형 (환경보전협회) ;
  • 안태웅 ((주)엔솔파트너스) ;
  • 신현상 (서울과학기술대학교 환경공학과)
  • Received : 2020.02.18
  • Accepted : 2020.03.18
  • Published : 2020.03.30
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Abstract

In this study, we identified the major pollution-zones of the mainstream and its tributaries of Gongneung stream and investigated their pollution sources based on water quality, flowrate and pollution-load data of the stream having the characteristics of the urban-rural complex to examine the effect of the tributaries on the water quality changes in the mainstream. The water quality and flowrate data were collected for 10 months (2018 ~ 2019) at 3 points of mainstream and ten tributaries. Water quality index (WQI), load duration curve (LDC), discharge load density (DLD)and delivery ratios for each tributary were obtained so as to investigate the pollution characteristics and some of the information visualized on GIS. The main pollution-zone in the Gongneung stream was in the middle and lower streams, and the tributaries that may affect the pollution of the area were JS, JY, SL and SM. JS and SL had low WQI levels (34.7/37.5) and DLD (kg/d/㎢) of BOD and T-P were relatively high in JY (99.2/6.00) and SL (60.0/2.07). BOD and T-P delivery ratios in JS were high (0.94/0.83), suggesting that JS had significant influence on the water quality of the main pollution-zone in the Gongneung stream. Meanwhile, SM having a high T-P delivery ratio (0.97) was found to be more affected by the non-point source due to the higher LDC excess rate (%) in the low flow compared to high flow. This study provides basic data on the water quality and pollution characteristics of the Gongneung stream, and the analysis results are expected to be used as examples for identifying the main pollution-zone and tributaries of stream and their pollution sources.

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