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.
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.
Fig. 3. Box plot of stream water flux at the HR-H4 station in comparison with major artificial discharges in 2016.
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)”.
Fig. 5. Seasonal water chemistry (mean ± standard deviation) in the Yangjae stream for three years (2015 ~ 2017).
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)”.
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.
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
Table 2. Rotated factor matrix of the principle components for inflows in the Yangjae stream
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