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    Effects of Lifting Force on Bed Topography and Bed-Surface Sediment Size in Channel Bend

    Source: Journal of Hydraulic Engineering:;2011:;Volume ( 137 ):;issue: 009
    Author:
    Jiun-Huei Jang
    ,
    Hsin-ya Ho
    ,
    Chin-lien Yen
    DOI: 10.1061/(ASCE)HY.1943-7900.0000402
    Publisher: American Society of Civil Engineers
    Abstract: In bed-load sediment transport, the lifting force plays an important role in reducing the friction between sediment particles and the bed surface, and it makes particle transportation by the shear force easier. Because the lifting force is related to vorticity, a three-dimensional (3D) numerical model incorporating large eddy simulations was applied to simulate the vorticity field in a channel bend. The results show that the distribution of vorticity is highly nonuniform, and it can lead to significant variations in lifting force and bed-load sediment transport per unit width in a channel bend. Relevant theories are modified on the basis of physical reasoning and then incorporated into numerical models to investigate the lifting-force effects on the bed topography and bed-surface sediment size gradation in a channel bend. With the lifting-force effects considered, it is shown that the errors in simulated bed topography can be reduced by approximately 40% and in bed-surface sediment size by 50%.
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      Effects of Lifting Force on Bed Topography and Bed-Surface Sediment Size in Channel Bend

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/64249
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    contributor authorJiun-Huei Jang
    contributor authorHsin-ya Ho
    contributor authorChin-lien Yen
    date accessioned2017-05-08T21:51:06Z
    date available2017-05-08T21:51:06Z
    date copyrightSeptember 2011
    date issued2011
    identifier other%28asce%29hy%2E1943-7900%2E0000428.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/64249
    description abstractIn bed-load sediment transport, the lifting force plays an important role in reducing the friction between sediment particles and the bed surface, and it makes particle transportation by the shear force easier. Because the lifting force is related to vorticity, a three-dimensional (3D) numerical model incorporating large eddy simulations was applied to simulate the vorticity field in a channel bend. The results show that the distribution of vorticity is highly nonuniform, and it can lead to significant variations in lifting force and bed-load sediment transport per unit width in a channel bend. Relevant theories are modified on the basis of physical reasoning and then incorporated into numerical models to investigate the lifting-force effects on the bed topography and bed-surface sediment size gradation in a channel bend. With the lifting-force effects considered, it is shown that the errors in simulated bed topography can be reduced by approximately 40% and in bed-surface sediment size by 50%.
    publisherAmerican Society of Civil Engineers
    titleEffects of Lifting Force on Bed Topography and Bed-Surface Sediment Size in Channel Bend
    typeJournal Paper
    journal volume137
    journal issue9
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)HY.1943-7900.0000402
    treeJournal of Hydraulic Engineering:;2011:;Volume ( 137 ):;issue: 009
    contenttypeFulltext
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