Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Hydrochemical Effects of Tributaries and Discharged Waters in the Yangjae Stream Flowing Peri-urban Area

하천유지용수와 지천 유입에 따른 도시하천 양재천의 수리화학적 변화 연구

  • Kim, Youn-Tae (Institute of Natural Sciences, Yonsei University) ;
  • Chung, Euijin (Department of Earth System Sciences, Yonsei University) ;
  • Park, Jonghoon (Department of Earth System Sciences, Yonsei University) ;
  • Woo, Nam C. (Department of Earth System Sciences, Yonsei University)
  • 김연태 (연세대학교 자연과학연구원) ;
  • 정의진 (연세대학교 지구시스템과학과) ;
  • 박종훈 (연세대학교 지구시스템과학과) ;
  • 우남칠 (연세대학교 지구시스템과학과)
  • Received : 2018.10.15
  • Accepted : 2018.11.28
  • Published : 2018.11.30
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Abstract

The purpose of this study was to understand the unique and complicated feature of urban stream receiving various inflows. The Yangjae stream, the second tier of the Han River, runs through the southern parts of Seoul, Korea and its middle part flows on the boundary of Seoul where land use is actively changing. Stream flow was greatly influenced by rainfall. Other than rainfall events, effluent discharge from wastewater treatment plant (WWTP) comprised 51 % of stream flux. As a result, majority ions water chemistry was changed at the receiving zone of the discharged effluent (Zone A). Its contribution increased to 69.9 % at the second sampling period with low stream flow. In the middle zone, inflows from the northern area, recently developed to a residential district showed low $NO_3-N$ and high $HCO_3$, Ca, $SO_4$, and $SiO_2$ indicating the effects of groundwater and concrete. One inflow (T-8), with extremely high Na and Cl, median $SiO_2$, was assessed to have anthropogenic influence, however its contribution to main stream was under 1 %. Road construction near Y-13 also affected water chemistry leading to the highest Na and Cl concentration. These hydro chemical changes can be critically used to evaluate the changes in water budget and fate of chemicals in a peri-urban watershed occasioned by human activities on the Yangjae.

Keywords

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Fig. 1. Information about the study area. (a) Map of watershed with streams, (b) Sampling locations and structures which can affect the hydrochemistry of the Yangjae stream.

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Fig. 2. Variation of water level in the Yangjae stream. Daily water level at the Daechi-bridge station in 2016 was plotted against daily rainfall at the Gwacheon station. The gray color means data was affected by rainfall, less than 3 of antecedent dry day.

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Fig. 3. Box plot of stream water flux at the HR-H4 station in comparison with major artificial discharges in 2016.

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Fig. 4. Statistical analysis for water chemistry of inflow samples. (a) Cluster dendrogram by average linkage between groups, (b) Factor score plot by principle component analysis. The data from the first sampling period was indicated by the suffix “(1)”.

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Fig. 5. Seasonal water chemistry (mean ± standard deviation) in the Yangjae stream for three years (2015 ~ 2017).

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Fig. 6. Statistical analysis for main stream water chemistry. (a) Changes in EC by sampling location and period, (b) Cluster dendrogram by average linkage between groups. The data from the first sampling period (November 19, 2017) was indicated by open circle and the suffix “(1)”, and the one from the second sampling period (February 27, 2018) was done by closed circle and the suffix “(2)”.

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Fig. 7. Changes in concentration of major constituents along the Yangjae stream. Circle means the value in main stream and bar indicates the one in inflows. Open symbol means the data from the first sampling period and black symbol does from the second sampling period.

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Fig. 8. Annual average of total nitrogen concentration at the Daechi-bridge Station and concentration of discharged effluent from the waste water treatment plant of Gwacheon City.

Table 1. Chemical characteristics of stream water and inflows in the Yangjae stream

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Table 2. Rotated factor matrix of the principle components for inflows in the Yangjae stream

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