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- W2017306022 abstract "Theory is developed to describe the vertical structure of a continuous plume emitted from a ground-based source in the diabatic surface layer. It was found that the mean height z(x) and the root-mean square width σz(x) could each be represented by solutions of the base equations dzi/dt = biu∗ φ(zi/L) and dx/dt = u(zi)(i = 1, 2). The case i = 1 depicts the z variation (z1 ≡ z) and i = 2 signifies the σz variation (z2 ≡ σz). Terms u, u∗, t signify the wind speed, friction velocity and time, respectively; φi are stability functions dependent on the Monin-Obukhov length (L), with φi = (1 − αizi/L)12and (1 + βizi/L)−1 for L ⩽ 0 and L ⩾ 0, respectively; remaining parameters are coefficients, e.g. b1 = 0.4, b2 = 0.57. The base equations (i = 3) were also used to examine the trajectory of the plume “height”, zmax; this is defined by the position χ(zmax) = 0.1 χ(0) in which χ(z) is the gaseous concentration at height z. In unstable conditions, the vertical propagation dzmax/dt was adequately specified by a velocity w = σw, where σw is the standard deviation of the vertical fluctuating component in the horizontal wind speed. In stable conditions, experimental evidence suggested that w = 1.2(4)u∗/(1 + βzmax/L) with β ≈ 2. Amongst the conclusions, it was shown that σz(x/z0, z0/L) = z((b2/b1)(x/z0), z0/L) provided φ1 = φ2and that σz/z ≈ (b2/b1)qin which √2⩽q⩽2 and z0 is the roughness length." @default.
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- W2017306022 date "1991-01-01" @default.
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- W2017306022 title "Characterizing plume dispersion in the diabatic surface layer by trajectory analysis" @default.
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- W2017306022 doi "https://doi.org/10.1016/0960-1686(91)90309-u" @default.
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