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Temperature Effects in Flows over Nonplanar Beds
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.
Temperature Effects in Flows over Nonplanar Beds
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.
Temperature Effects in Flows over Nonplanar Beds
Taylor, Brent D. (author)
Journal of the Hydraulics Division ; 100 ; 1785-1807
2021-01-01
231974-01-01 pages
Article (Journal)
Electronic Resource
Unknown
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