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Temporal Evolution of Clear-Water Scour Depth at Submerged Weirs

Wang, Lu / Melville, Bruce W. / Whittaker, Colin N. / Guan, Dawei

Equilibrium clear-water scour depths predicted by existing equations based on the peak flow rate of a flood hydrograph can be overly conservative for submerged weirs in mild-slope sandy rivers, because the equilibrium timescale normally is much larger than the timescale of a flood event. Therefore it is important to understand the clear-water scour development at submerged weirs in order to improve the accuracy of scour estimation. This paper presents new data on the temporal evolution of the downstream clear-water scour depth at a submerged weir under steady flow conditions and analyzed the impacts of flow intensity, weir height, sand coarseness parameter, and weir slope on the development of the downstream clear-water scour depth. This study defined a dimensionless equilibrium time scale $t_{e}^{*}$ and evaluated its dependencies on the aforementioned parameters. Predictors for $t_{e}^{*}$ and the temporal downstream clear-water scour depth at submerged weirs are proposed.

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Temporal Evolution of Clear-Water Scour Depth at Submerged Weirs

Wang, Lu / Melville, Bruce W. / Whittaker, Colin N. / Guan, Dawei

Equilibrium clear-water scour depths predicted by existing equations based on the peak flow rate of a flood hydrograph can be overly conservative for submerged weirs in mild-slope sandy rivers, because the equilibrium timescale normally is much larger than the timescale of a flood event. Therefore it is important to understand the clear-water scour development at submerged weirs in order to improve the accuracy of scour estimation. This paper presents new data on the temporal evolution of the downstream clear-water scour depth at a submerged weir under steady flow conditions and analyzed the impacts of flow intensity, weir height, sand coarseness parameter, and weir slope on the development of the downstream clear-water scour depth. This study defined a dimensionless equilibrium time scale $t_{e}^{*}$ and evaluated its dependencies on the aforementioned parameters. Predictors for $t_{e}^{*}$ and the temporal downstream clear-water scour depth at submerged weirs are proposed.

Temporal Evolution of Clear-Water Scour Depth at Submerged Weirs

Wang, Lu / Melville, Bruce W. / Whittaker, Colin N. / Guan, Dawei

Equilibrium clear-water scour depths predicted by existing equations based on the peak flow rate of a flood hydrograph can be overly conservative for submerged weirs in mild-slope sandy rivers, because the equilibrium timescale normally is much larger than the timescale of a flood event. Therefore it is important to understand the clear-water scour development at submerged weirs in order to improve the accuracy of scour estimation. This paper presents new data on the temporal evolution of the downstream clear-water scour depth at a submerged weir under steady flow conditions and analyzed the impacts of flow intensity, weir height, sand coarseness parameter, and weir slope on the development of the downstream clear-water scour depth. This study defined a dimensionless equilibrium time scale $t_{e}^{*}$ and evaluated its dependencies on the aforementioned parameters. Predictors for $t_{e}^{*}$ and the temporal downstream clear-water scour depth at submerged weirs are proposed.

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Title:

Temporal Evolution of Clear-Water Scour Depth at Submerged Weirs

Contributors:

Wang, Lu (author) / Melville, Bruce W. (author) / Whittaker, Colin N. (author) / Guan, Dawei (author)

Published in:

Journal of Hydraulic Engineering ; 146

Publication date:

2020-01-10

ISSN:

0733-9429 , 1943-7900

DOI:

https://doi.org/10.1061/(ASCE)HY.1943-7900.0001712

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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