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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Experimental study of two-dimensional mixing of natural tracers in rivers
Experimental study of two-dimensional mixing of natural tracers in rivers
In this research, pollutant tracing study was conducted to investigate the transverse mixing characteristics at the
downstream of the tributary confluence in the middle reach of Nakdong River in Korea. Two tributaries of Keumho River
and Jincheon Creek, merging to the left side of the Nakdong River near Gangjeung Weir, contain various pollutants from
point and non-point sources such as wastewater and sewage treatment plants of nearby cities and industrial complexes.
The electric conductivity (EC) was selected as a natural tracer because EC levels were high in these incoming tributaries.
In the tributaries of Keumho River and Jincheon, the conductivity concentration showed almost uniform distribution to
the transverse direction, and average concentration levels are higher than the background concentration of the Nakdong
River at the upstream of the confluence. In the Nakdong River, after two tributaries merged at the left side, non-uniform
distribution of the EC concentration was observed at the downstream sections due to transverse mixing of EC cloud
introduced from the tributary channels. However, as EC cloud was moving further downstream, the transverse gradient
of EC concentration was decreasing. Transverse dispersion coefficient was calculated using the stream-tube moment
method. The calculated values of dimensionless transverse dispersion coefficient had a range of 0.49 ~ 1.39, which were
close to the values suggested by Rutherford (1994) for curved channels.
File Size : 322,721 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 18/08/2015
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