Temperature Effects in High-Transport, Flat-Bed Flows

by Brent D. Taylor, U.S. Navy; formerly, Grad. Res. Asst., W. M. Keck Lab. of Hydr. and Water Resources, California Inst. of Technol., Pasadena, CA,
Vito A. Vanoni, Prof. of Hydr.; W. M. Keck Lab. of Hydr. and Water Resources, California Inst. of Technol., Pasadena, CA,


Serial Information: Journal of the Hydraulics Division, 1972, Vol. 98, Issue 12, Pg. 2191-2206


Document Type: Journal Paper

Abstract: Flume experiments show that in flows over flat beds of fine sand, the concentration of suspended load near the bed and the bed-load discharge of different size fractions of the bed sediment react differently to a change in water temperature. For example, an increase in water temperature alone caused the concentration near the bed and the bed-load discharge to increase for the finer fractions of the sediment and to decrease for the coarser fractions. The reaction of bed-load discharge of sediment of a given size to changes in water temperature can be expressed in terms of the boundary Reynolds number, R∗b, which is formed of the product of shear velocity and sediment diameter divided by the kinematic viscosity of the water. An increase in temperature will cause an increase in bed-load discharge of a particular size fraction when R∗b based on the mean size of the fraction is less than 13, and a decrease in bed-load discharge when R∗b exceeds 20.

Subject Headings: Bed loads | Water discharge | Temperature effects | Bed materials | Sediment | Water temperature | Suspended loads | Flumes

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