CNCS Center for Nonlinear and Complex Systems
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Publications [#351230] of Gabriel G. Katul

Papers Published

  1. Liu, X; Zeng, Y; Katul, G; Huai, W; Bai, Y, Longitudinal dispersal properties of floating seeds within open-channel flows covered by emergent vegetation, Advances in Water Resources, vol. 144 (October, 2020) [doi]
    (last updated on 2023/06/01)

    Abstract:
    The effect of emergent stems on the transport of downstream floating particles (e.g., buoyant seeds) is explored theoretically and experimentally at moderate to high Reynolds number (Rd=2Ubas/υ>300) in an open channel, where Ub is the bulk velocity, as is stem radius, and ν is the kinematic viscosity. Longitudinal dispersion (Dl) of such seeds is shown to be given by Dl=Up3τ02η(1−η)/2/(S1+ητ0Up) thereby requiring the bulk transport velocity of particles Up, spacing between canopy elements S1, collision efficiency η between a particle and the stem, and a wake trapping time scale τ0. Linkages between Up and Ub, and terms η and τ0 are then derived using inhomogeneous flow characteristics adjacent to the stem with physical properties of particles. A semiempirical model with potential flow theory around the stem is introduced to estimate η whereas τ0 is shown to be related to the bulk drag coefficient and radius of stems. The Dl is experimentally determined across a wide range of Rd and particle sizes and shown to be in good agreement with the proposed model calculations.