Flow Resistance of High-Gradient Gravel Channels

by R. G. Millar, Univ of British Columbia, Vancouver, BC, Canada,
M. C. Quick, (M.ASCE), Univ of British Columbia, Vancouver, BC, Canada,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The flow resistance in terms of the friction factor for bank-full or high in-bank flows for 120 high-gradient gravel-bed rivers are examined. The friction factor f was divided into grain and form components and it was shown that the flow resistance due to the grain roughness can be readily calculated by assuming ks = D50. The flow resistance due to bars, bedforms, and other channel irregularities can be large in gravel rivers even at bank-full flow.

Subject Headings: Flow resistance | River flow | Load and resistance factor design | Gravels | Friction | River bank stabilization | Hydraulic roughness

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