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Date
2000-02Type
- Journal Article
ETH Bibliography
yes
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Abstract
Settling tanks are hydraulically designed on a settling velocity. Observations have indicated that out-of-the-basin sediment transport may be initiated by corner vortices, which are able to scour a sediment layer and significantly reduce the efficiency of sediment deposition. Using four different materials—with densities from close to water up to sand, and diameters from 0.55 to 3.0 mm—the various forms of vortex scour were experimentally determined. The densimetric particle Froude number could be identified as the scaling quantity that governs these processes. The scour process can be reduced by inserting so-called antivortex elements, by which the 3D corner flow characteristics are influenced to result in a more 2D flow over a wall. The location and length of these elements were found to be similar to elements recently recommended for standard gates. Show more
Publication status
publishedExternal links
Journal / series
Journal of Environmental EngineeringVolume
Pages / Article No.
Publisher
American Society of Civil EngineersOrganisational unit
03820 - Boes, Robert / Boes, Robert
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ETH Bibliography
yes
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