Research Article
Dec 1974
Temperature Effects in Flows over Nonplanar Beds
Publication: Journal of the Hydraulics Division
Volume 100, Issue 12
Abstract
Laboratory results show that in flows over ripple and dune beds a 15-20°C increase in water temperature can affect significant changes in bed-load discharge, bed form and roughness. These results are correlated with data from natural streams. The analysis indicates that temperature related changes in a stream at constant discharge are primarily a function of grain-roughness boundary Reynolds number R߱∗b. In flows in which R߱∗b is less than a value near 10, an increase in water temperature effects an increase in bed-load discharge and an early (lower-velocity) transition from ripples to dunes. Whereas 10 〈 R߱∗b 〉 20 which is obtained in several American rivers, the temperature effect on bed-load discharge depends on the distribution of bed sediment sizes due to a qualitative change in temperature effect on bed-load discharge that takes place in this range of R߱∗b and bed form transitions, e.g., dunes to flat bed, occur at lower velocities with cold water.
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Published In
Journal of the Hydraulics Division
Volume 100 • Issue 12 • December 1974
Pages: 1785 - 1807
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: Dec 1974
Published online: Feb 3, 2021
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Brent D. Taylor, AM.ASCE
Lieutenant, CEC, U.S. Navy, Civ. Engrg. Lab., Naval Construction Battalion Center, Port Hueneme, Calif.; formerly, Grad. Research Asst., W. M . Keck Lab. of Hydraulics and Water Resources, Calif. Inst. of Tech., Pasadena, Calif
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.