On the Mean Flow Behaviour in the Presence of Regional-Scale Surface Roughness Heterogeneity

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    A suite of large-eddy simulations of the neutral atmospheric boundary layer is conducted to study the mean flow response to the presence of surface roughness heterogeneity at regional scales (surface roughness heterogeneity on the scale of several boundary-layer heights). The roughness heterogeneity is imposed using alternating rough wall patches with numerically resolved rectangular roughness elements of different packing densities. The flow near the surface is found to adjust rapidly, reaching equilibrium conditions at distances on the order of a single inter-roughness element spacing. Despite the regional heterogeneity in surface roughness, it is often desirable to parametrize the entire rough wall using one single effective roughness height. To develop such a parametrization the model of Bou-Zeid et al. [Water Resources Research 40(2):1, 2004] is extended to incorporate the displacement height, d. Predictions from this parametrization are compared with the simulations, with reasonably good agreement.

    Original languageEnglish (US)
    Pages (from-to)127-143
    Number of pages17
    JournalBoundary-Layer Meteorology
    Volume161
    Issue number1
    DOIs
    StatePublished - Oct 1 2016

    Fingerprint

    surface roughness
    roughness
    boundary layer
    large eddy simulation
    spacing
    water resource
    prediction
    simulation

    All Science Journal Classification (ASJC) codes

    • Atmospheric Science

    Cite this

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    title = "On the Mean Flow Behaviour in the Presence of Regional-Scale Surface Roughness Heterogeneity",
    abstract = "A suite of large-eddy simulations of the neutral atmospheric boundary layer is conducted to study the mean flow response to the presence of surface roughness heterogeneity at regional scales (surface roughness heterogeneity on the scale of several boundary-layer heights). The roughness heterogeneity is imposed using alternating rough wall patches with numerically resolved rectangular roughness elements of different packing densities. The flow near the surface is found to adjust rapidly, reaching equilibrium conditions at distances on the order of a single inter-roughness element spacing. Despite the regional heterogeneity in surface roughness, it is often desirable to parametrize the entire rough wall using one single effective roughness height. To develop such a parametrization the model of Bou-Zeid et al. [Water Resources Research 40(2):1, 2004] is extended to incorporate the displacement height, d. Predictions from this parametrization are compared with the simulations, with reasonably good agreement.",
    author = "Xiang Yang",
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    On the Mean Flow Behaviour in the Presence of Regional-Scale Surface Roughness Heterogeneity. / Yang, Xiang.

    In: Boundary-Layer Meteorology, Vol. 161, No. 1, 01.10.2016, p. 127-143.

    Research output: Contribution to journalArticle

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    AB - A suite of large-eddy simulations of the neutral atmospheric boundary layer is conducted to study the mean flow response to the presence of surface roughness heterogeneity at regional scales (surface roughness heterogeneity on the scale of several boundary-layer heights). The roughness heterogeneity is imposed using alternating rough wall patches with numerically resolved rectangular roughness elements of different packing densities. The flow near the surface is found to adjust rapidly, reaching equilibrium conditions at distances on the order of a single inter-roughness element spacing. Despite the regional heterogeneity in surface roughness, it is often desirable to parametrize the entire rough wall using one single effective roughness height. To develop such a parametrization the model of Bou-Zeid et al. [Water Resources Research 40(2):1, 2004] is extended to incorporate the displacement height, d. Predictions from this parametrization are compared with the simulations, with reasonably good agreement.

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