Experimental Study of Transverse Mixing of Pollutants in Trapezoidal Open Channel
Problems related to water mixing becoming more important, especially when it comes to evaluate the impact of a domestic, industrial or thermal discharge on the receiving stream. The need to predict the water quality according to the rate of the dispersion of pollutants has pushed researchers to develop several mixing models. These models, developed from the Advection–Dispersion Equation, are aimed to identify and predict the spatiotemporal evolution of the concentration of a given pollutant.
Since streams often have a much greater width than the depth; vertical mixing of pollutants is complete and transverse mixing is predominant. Away from the injection point; the problem becomes one-dimensional; is the longitudinal dispersion.
In this article, the transverse mixing problem has been studied in a trapezoidal channel, several concentration measurements in the longitudinal and lateral direction of the flow were performed, and for different scenarios of injections of pollutant in the channel, the results obtained show a great influence of the flow and quantity of pollutants on the transverse mixing phenomenon.
KeywordsTrapezoidal channel Pollution Transverse mixing Transport of pollutants Phenol
- Chanson, H. (2004). Environmental hydraulics of open channel flow. Library of Congress Cataloguing in Publication Data, 423p.Google Scholar
- Chaudhry, M. H. (2008). Open channel flow (2nd ed., 523p). Library of Congress, Control Number: 2007936602. New York: Springer.Google Scholar
- Czernuszenko, W., & Alexey, R. (2005). Three-dimensional model of flow and mixing processes in open channels. In Water quality hazards and dispersion of pollutants (pp. 35–54). Library of Congress Cataloging-in-Publication Data. New York: Springer.Google Scholar
- Dingman, S. L. (2009). Fluvial hydraulics. Oxford: Oxford University Press. 559p.Google Scholar
- Ernest, F. B., & Horace, W. K. (1996). Handbook of hydraulics (7th ed.). New York: McGraw-Hill. 611p.Google Scholar
- Fischer, H. B. (1966). Longitudinal dispersion in laboratory and natural streams. Report N°. KH-R-12 . Journal of Water Resources Division, 250p.Google Scholar
- Fischer, H. B. (1967). The mechanisms of dispersion in natural streams. Journal of Hydraulic Division. ASCE, 93(HY6), 187–215.Google Scholar
- Fischer, H. B. & John, E. L. (1979). Mixing in inland and coastal waters. Academic Press. Library of Congress Cataloging in Publication Data, 458p.Google Scholar
- Gharbi, S. (1999). Évaluation des coefficients de mélange longitudinal et transversal des polluants dans les cours d'eau: proposition de nouvelles formules. Thèse Doctorat à l’université Laval, Québec, 197p.Google Scholar
- Gualtieri, C., & Dragutin, T. M. (2008). Fluid mechanics in environmental interfaces, Taylor & Francis e-Library, 332p.Google Scholar
- Jabour, D. (2006). Etude expérimentale et modélisation de la dispersion en champ lointain suite à un rejet accidentel d'un polluant miscible dans un cours d'eau. Application à la gestion de crise. Thèse Doctorat à l’Université de Provence, 246p.Google Scholar
- Lencastre, A. (2005). Hydraulique Général. Edition Eyrolles, 633p.Google Scholar
- Rutherford, J. C. (1994). River mixing. New York: Willey. 347p.Google Scholar
- Steve, W., & Russell, M. (2005). On the theoretical prediction of longitudinal dispersion coefficients in a compound channel. In Water quality hazards and dispersion of pollutants (pp. 69–84). Library of Congress Cataloging-in-Publication Data. New York: Springer.Google Scholar
- Van Prooijen, B. G., & Uijttewaal, W. S. J. (2005). Horizontal mixing in shallow flows; Physical aspects and numerical modelling. In Water quality hazards and dispersion of pollutants (pp 55–68). Library of Congress Cataloging-in-Publication Data. New York: Springer.Google Scholar