洛東江 下流의 水質과 汚染負荷量에 관한 硏究

Study on the Water Quality and the Loading of Pollutants in the Downstream of Nakdong River

The water quality and the budget of pollutant loading in the downstream of Nakdong River were surveyed at 3 sites along the main stream from Mulgum to Hadan and 1 site of Yangsan tributary with response to the tides in May and June, 1983. The level of TSS in the Yangsan tributary, 6.1~21.3mg/l, was higher than any other site. The mean vaIues of BOD were 1.16mg/l at Mulgum site. I.83mg/l Yangsan site, O.79mg/l Hwamyeong site and 3.56mg/l at Hadan site. The levels of NH₄+-N and PO₄3- -P were the highest at Hadan site, and the levels of zinc and copper were 2.11~5.98ppb and ND-50.00ppb at Yangsan tributary site. Although the flow rate of Yangsan stream accounted for only 4% of that of main stream, but the mean value of pollutant loading in the Yangsan stream amounted to 8.3% of the that of main steam.