Flow resistance and momentum flux in compound open channels

Zhixian Cao, Jian Meng, Gareth Pender, Steve Wallis

    Research output: Contribution to journalArticle

    26 Citations (Scopus)

    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

    Keywords

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

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