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    Downstream Local Scour of PKW with Different Shapes and Numbers of Flow Splitters

    Source: Journal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 004::page 04025015-1
    Author:
    Amirhossein Fathi
    ,
    Ali Khoshfetrat
    ,
    Seyed Hamid Alavi
    DOI: 10.1061/JHEND8.HYENG-14143
    Publisher: American Society of Civil Engineers
    Abstract: The high discharge capacity of piano key weirs (PKWs), an evolved form of labyrinth weirs, necessitates downstream scour mitigation. For the first time to our best knowledge, this study examines scouring reduction employing a Type C trapezoidal PKW with varying flow rates, tailwater depths, and flow splitter configurations (circular/rectangular; two, four, and six per cycle). Results indicated that reduced tailwater depth, increased discharge, and finer bed particles would cause enhanced maximum scour depth. Splitters lowered the maximum scour depth by an average of 13.3% (rectangular) and 7.1% (circular) compared to no splitters in gravel bed materials. Elevation of the number of flow splitters per cycle reduced the maximum scour depth, with the lowest value observed in the weir with six rectangular flow splitters. Flow splitters elongated the scour hole and shifted the maximum scour depth further from the weir toe. Finally, applying the dimensional analysis and considering the dominant parameters of bed materials, flow splitters, and flow hydraulic characteristics, relationships were derived for estimating the maximum scour depth.
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      Downstream Local Scour of PKW with Different Shapes and Numbers of Flow Splitters

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    contributor authorAmirhossein Fathi
    contributor authorAli Khoshfetrat
    contributor authorSeyed Hamid Alavi
    date accessioned2025-08-17T22:47:26Z
    date available2025-08-17T22:47:26Z
    date copyright7/1/2025 12:00:00 AM
    date issued2025
    identifier otherJHEND8.HYENG-14143.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307454
    description abstractThe high discharge capacity of piano key weirs (PKWs), an evolved form of labyrinth weirs, necessitates downstream scour mitigation. For the first time to our best knowledge, this study examines scouring reduction employing a Type C trapezoidal PKW with varying flow rates, tailwater depths, and flow splitter configurations (circular/rectangular; two, four, and six per cycle). Results indicated that reduced tailwater depth, increased discharge, and finer bed particles would cause enhanced maximum scour depth. Splitters lowered the maximum scour depth by an average of 13.3% (rectangular) and 7.1% (circular) compared to no splitters in gravel bed materials. Elevation of the number of flow splitters per cycle reduced the maximum scour depth, with the lowest value observed in the weir with six rectangular flow splitters. Flow splitters elongated the scour hole and shifted the maximum scour depth further from the weir toe. Finally, applying the dimensional analysis and considering the dominant parameters of bed materials, flow splitters, and flow hydraulic characteristics, relationships were derived for estimating the maximum scour depth.
    publisherAmerican Society of Civil Engineers
    titleDownstream Local Scour of PKW with Different Shapes and Numbers of Flow Splitters
    typeJournal Article
    journal volume151
    journal issue4
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/JHEND8.HYENG-14143
    journal fristpage04025015-1
    journal lastpage04025015-13
    page13
    treeJournal of Hydraulic Engineering:;2025:;Volume ( 151 ):;issue: 004
    contenttypeFulltext
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