This study was performed to determine the correlations-hips among items of water quality and to analize the external effects in the Han River.
Water quality for analysis were the´daily mean values of dissolved oxygen, water temperature, conductivity, pH, turbidity, and water discharge checked at Noryang-Jin -and Duk-Do in the Han River from January I to De
cember 31, 1976. Air temperature and rain fail data were obtained from the Central Meteorological Office.
The results of correlation analysis and stepwise multiple regression analysis are summarized as follows.
1 . Water temperature and conductivity showed significant negative correlationship with dissolved oxygen,
with` correlation coefficient of -0.878, and -0.627 respectively.
2 . Multiple regression equation for estimate of dissolved oxygen is as follows ;
DO=-3.0.675 -0.2251W. T. -0.02320. T. +2.3349pH
3.-Water temperature -seems to have. high correlationship with other water qualities.
4 . Correlation coefficient of water discharge and turbidity was high (r 0. 746), but those of other items . . and turbidity showed extremely low.--
5. -The difference of water qualities between Noryang-Jin and Duk-Do in the Han River, is as follows ; Variations of dissolved oxygen and water temperature were. dominantly affected by air temperature, while pH and turbidity were influenced by other .facters.
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