Computation of Transverse Mixing in Streams
Publication: Journal of Environmental Engineering
Volume 120, Issue 3
Abstract
The problem of solute-mass transport in natural streams is tackled via a governing equation that employs the cumulative discharge, instead of the transverse distance, as an independent variable thus eleminating the need to know the transverse-velocity field. The problem is solved by a numerical scheme, which utilizes exponential interpolation between adjacent nodes. The scheme can regress to a linear-interpolation scheme for Peclet number equal to zero or to an upwind scheme for very large values of the Peclet number. Comparison with field data showed that the problem can be solved satisfactorily based on the knowledge of cross-sectional-geometric data and total-river discharge only, provided that the riverine cross sections are not highly irregular. The computed transverse-dispersion coefficients agree well with values reported in the literature. An independent verification of the transverse-dispersion-coefficient values was obtained by application of a modified method of moments on the same field data.
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References
1.
Beltaos, S. (1980). “Transverse mixing tests in natural streams.” J. Hydr. Div., ASCE, 106(10), 1607–1625.
2.
Demetracopoulos, A. C., and Korfiatis, G. P. (1983). “Modeling water movement through sanitary landfills.” Frontiers in Hydro., Proc. 1983 ASCE Hydr. Div. Specialty Conf., ASCE, New York, N.Y., 54–59.
3.
Elhadi, N., Harrington, A., Hill, I., Lau, Y. L., and Krishnappan, B. G. (1984). “River mixing—a state‐of‐the‐art report.” Can. J. Civ. Engrg., 11(3), 585–609.
4.
Fischer, H. B. (1968). “Dispersion predictions in natural streams.” J. Sanitary Engrg. Div., ASCE, 94(5), 927–944.
5.
Holley, E. R., Siemons, J., and Abraham, G. (1972). “Some aspects of analyzing transverse diffusion in rivers.” J. Hydr. Res., 10(1), 27–57.
6.
Lau, Y. L., and Krishnappan, B. G. (1981). “Modeling transverse mixing in natural streams.” J. Hydr. Div., ASCE, 107(2), 209–226.
7.
Patankar, S. V. (1980). Numerical heat transfer and fluid flow. Hemisphere Publishing Corp., New York, N.Y.
8.
Yotsukura, N., and Sayre, W. W. (1976). “Transverse mixing in natural channels.” Water Resour. Res., 12(4), 695–704.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 120 • Issue 3 • May 1994
Pages: 699 - 706
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Oct 6, 1992
Published online: May 1, 1994
Published in print: May 1994
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