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    Temporal Evolution of Clear-Water Scour Depth at Submerged Weirs

    Source: Journal of Hydraulic Engineering:;2020:;Volume ( 146 ):;issue: 003
    Author:
    Lu Wang
    ,
    Bruce W. Melville
    ,
    Colin N. Whittaker
    ,
    Dawei Guan
    DOI: 10.1061/(ASCE)HY.1943-7900.0001712
    Publisher: ASCE
    Abstract: 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 te* and evaluated its dependencies on the aforementioned parameters. Predictors for te* 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

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4266854
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    contributor authorLu Wang
    contributor authorBruce W. Melville
    contributor authorColin N. Whittaker
    contributor authorDawei Guan
    date accessioned2022-01-30T20:38:22Z
    date available2022-01-30T20:38:22Z
    date issued3/1/2020 12:00:00 AM
    identifier other%28ASCE%29HY.1943-7900.0001712.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4266854
    description abstractEquilibrium 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 te* and evaluated its dependencies on the aforementioned parameters. Predictors for te* and the temporal downstream clear-water scour depth at submerged weirs are proposed.
    publisherASCE
    titleTemporal Evolution of Clear-Water Scour Depth at Submerged Weirs
    typeJournal Paper
    journal volume146
    journal issue3
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)HY.1943-7900.0001712
    page7
    treeJournal of Hydraulic Engineering:;2020:;Volume ( 146 ):;issue: 003
    contenttypeFulltext
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