Determination of reaeration-rate coefficient by modified tracer gas technique
Article first published online: 11 JUN 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Volume 27, Issue 19, pages 2710–2720, 15 September 2013
How to Cite
Soares, P. A., Faht, G., Pinheiro, A., da Silva, M. R. and Zucco, E. (2013), Determination of reaeration-rate coefficient by modified tracer gas technique. Hydrol. Process., 27: 2710–2720. doi: 10.1002/hyp.9371
- Issue published online: 6 AUG 2013
- Article first published online: 11 JUN 2012
- Accepted manuscript online: 1 MAY 2012 09:26PM EST
- Manuscript Accepted: 10 APR 2012
- Manuscript Revised: 12 MAR 2012
- Manuscript Received: 19 MAY 2011
- reaeration-rate coefficient;
- dissolved oxygen
The modified tracer gas technique is used to determine the reaeration coefficient in six different water bodies of the Itajaí River basin, three with rural land use and three in urban areas. Propane was used as the tracer gas and Rhodamine WT as the conservative tracer, providing information on dilution, mixing and dispersion. Liquefied petroleum gas was used instead of high purity propane, aimed at reducing the costs associated with the field trials. Reaeration-rate coefficients observed in the field ranged from 25.8 to 367.7 d−1. Two data sets could be observed where smaller streams had substantially larger coefficients of between 133.1 and 367.7 d−1, while the larger streams had values ranging from 25.8 to 54.5 d−1. Five empirical equations were evaluated by comparing the values obtained in the field. The equations proposed by Tsivolgou and Wallace and Tsivoglou and Neal showed greater adherence to the values determined in the tests. Reaeration-rate coefficients obtained in the field were correlated with the hydrodynamic characteristics of the watercourses, thus establishing a mathematical function through which to obtain estimates for future evaluations. The R2 value obtained using this equation was 0.959, indicating a high correlation between the calculated values and those estimated in the field. Copyright © 2012 John Wiley & Sons, Ltd.