Flow resistance and momentum flux in compound open channels

Zhixian Cao, Jian Meng, Gareth Pender, Steve Wallis

    Research output: Contribution to journalArticle

    Abstract

    New formulations are presented for flow resistance and momentum flux in compound open channels. As implemented in the St. Venant equations, these formulations facilitate a physically enhanced approach to evaluating conveyance, roughness, stage-discharge relationship, and unsteady flood routing in compound open channels. An analysis using steady flow data from the well-controlled experiments at the large-scale Flood Channel Facility, HR Wallingford, demonstrates the ability of the present approach to properly resolve the discontinuity of overall roughness across the main-channel bankfull level. Also, the proposed formulations are shown to be conducive to obviating the long-standing computational difficulty in unsteady flood routing due to small flow depths over flat and wide floodplains. The present work should find general applications in one-dimensional computation of river flows. © 2006 ASCE.

    Original languageEnglish
    Pages (from-to)1272-1282
    Number of pages11
    JournalJournal of Hydraulic Engineering
    Volume132
    Issue number12
    DOIs
    Publication statusPublished - Dec 2006

    Fingerprint

    momentum
    flood routing
    roughness
    stage-discharge relationship
    steady flow
    river flow
    floodplain
    discontinuity
    experiment

    Keywords

    • Flood plains
    • Flood routing
    • Flow resistance
    • Open channel flow
    • Open channels
    • Roughness

    Cite this

    Cao, Zhixian ; Meng, Jian ; Pender, Gareth ; Wallis, Steve. / Flow resistance and momentum flux in compound open channels. In: Journal of Hydraulic Engineering. 2006 ; Vol. 132, No. 12. pp. 1272-1282.
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    Flow resistance and momentum flux in compound open channels. / Cao, Zhixian; Meng, Jian; Pender, Gareth; Wallis, Steve.

    In: Journal of Hydraulic Engineering, Vol. 132, No. 12, 12.2006, p. 1272-1282.

    Research output: Contribution to journalArticle

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    AU - Cao, Zhixian

    AU - Meng, Jian

    AU - Pender, Gareth

    AU - Wallis, Steve

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