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    Shallow sediment transport flow computation using time-varying sediment adaptation length

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    pu_hussain_shao_huang_ijsr.pdf (716.6Kb)
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    Publication date
    2014-06
    Author
    Pu, Jaan H.
    Shao, Songdong
    Huang, Y.
    Keyword
    Finite volume model; Harten Lax van Leer-contact solver; Monotonic upwind scheme; Sediment transport; Shallow water model; Time-varying sediment adaptation length
    Rights
    © 2014 International Research and Training Centre on Erosion and Sedimentation and the World Association for Sedimentation and Erosion Research. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
    Peer-Reviewed
    Yes
    
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    Abstract
    Based on the common approach, the adaptation length in sediment transport is normally estimated in the temporal independence. However, this approach might not be theoretically justified as the process of reaching of the sediment transport equilibrium stage is affected by the flow conditions in time, especially for those fast sediment moving flows, such as scour-hole developing flow. In this study, the 2D shallow water formulation together with a sediment continuity-concentration (SCC) model were applied to flow with mobile sediment boundary. A time-varying approach was proposed to determine the sediment transport adaptation length to treat the flow sediment erosion-deposition rate. The proposed computational model was based on the Finite Volume (FV) method. The Monotone Upwind Scheme of Conservative Laws (MUSCL)-Hancock scheme was used with the Harten Lax van Leer-contact (HLLC) approximate Riemann solver to discretize the FV model. In the flow applications of this paper, a highly discontinuous dam-break fast sediment transport flow was used to calibrate the proposed time-varying sediment adaptation length model. Then the calibrated model was further applied to two separate experimental sediment transport flow applications documented in literature, i.e. a highly concentrated sediment transport flow in a wide alluvial channel and a sediment aggradation flow. Good agreements with the experimental data were presented by the proposed model simulations. The tests prove that the proposed model, which was calibrated by the discontinuous dam-break bed scouring flow, also performed well to represent the rapid bed change and the steady sediment mobility conditions.
    URI
    http://hdl.handle.net/10454/8342
    Version
    Accepted Manuscript
    Citation
    Pu JH, Shao S and Huang Y (2014) Shallow sediment transport flow computation using time-varying sediment adaptation length. International Journal of Sediment Research. 29(2): 171- 183.
    Link to publisher’s version
    http://dx.doi.org/10.1016/S1001-6279(14)60033-0
    Type
    Article
    Collections
    Engineering and Digital Technology Publications

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