poster - International Conference of Agricultural Engineering

FIGURE 2 shows the SS and Turbidity variations of Seokji stream. The variations were
divided into irrigation and non-irrigation periods to analyze the changes in water quality to the
differences in the flow. The pollutant concentrations regarding COD, TOC, and Turbidity of
the non-irrigation periods were slightly higher than the pollutant concentrations of the
irrigation periods in the Hai reservoir. The pollutant concentrations of the regarding SS, COD,
COD, TOC, Turbidity, T-N, and T-P of the non-irrigation periods were higher than the
pollutant concentrations of the irrigation periods in the Seokji stream. The contaminant
concentrations decreased nearer downstream. However, at the last station, there was a
showing of an increase in concentration. This phenomenon was judged to be from the effects
of ambient pollutants, like incinerated waste. The concentrations of SS were almost
immeasurable during the non-irrigation periods. However, the concentrations of SS were
judged to be high due to the inflow of ambient pollutants during the irrigation periods.
FIGURE 2 SS and Turbidity variations for irrigation and non-irrigation periods of Seokji stream
3.3 Correlation Analysis between Water Quality Parameters
The correlation of water quality items from the reservoir and stream studies were analyzed
using the water quality data obtained in July. Water quality was the independent variable and
the control variable was the flow. In the case of the station located 530 m of Seokji stream,
the correlation coefficients between SS and T-P, and TOC and Turbidity were shown to be
0.925 and 0.960, respectively at a 0.01 level of significance. The correlation coefficients
between COD and TOC, SS and TOC, SS and Turbidity, and TOC and T-P were shown to
be 0.865, 0.854, 0.856, and 0.836, respectively at a 0.05 level of significance (TABLE 4). In
the case of the station located 750 m of Bonghyeon stream, the correlation coefficient
between COD and TOC was shown to be 0.887 at a 0.05 level of significance. At the station
located 1,260 m of Bonghyeon stream, the correlation coefficients between the pH and COD,
the pH and TOC, BOD and T-N, and COD and TOC were shown to be 0.920, 0.930, 0.938,
and 0.932, respectively at a 0.01 level of significance. The correlation coefficients between
the pH and T-P, BOD and COD, BOD and T-P, COD and T-P, TOC and T-P were shown to
be 0.813, 0.814, 0.822, 0.866, and 0.818, respectively at a 0.05 level of significance (TABLE
5).
TABLE 4 Correlation analysis of water quality data at Seokji stream (530 m)
pH BOD COD SS TOC Turbidity T-P T-N
pH 1.000 0.649 0.672 0.294 0.631 0.578 0.229 0.535
BOD 1.000 0.594 0.777 0.743 0.777 0.534 0.467
COD 1.000 0.571 0.865 * 0.744 0.530 0.449
SS 1.000 0.854 * 0.856 * 0.925 ** -0.069
TOC 1.000 0.960 ** 0.836 * 0.188
Turbidity 1.000 0.800 0.238
T-P 1.000 -0.343
T-N 1.000
* p