J. C. Kaimal's Atmospheric Boundary Layer Flows: Their Structure and PDF

By J. C. Kaimal

ISBN-10: 0195062396

ISBN-13: 9780195062397

Boundary layer meteorology is the learn of the actual techniques that ensue within the layer of air that's most affected via the earth's underlying floor. This text/reference offers an basic view of the constitution of the boundary layer, the tools on hand for measuring its suggest and turbulent houses, how most sensible to make the measurements, and how one can strategy and research the information. the most functions of the booklet are in atmospheric modelling, wind engineering, pollution, and agricultural meteorology. The authors have pioneered learn on atmospheric turbulence and circulation, and are famous for his or her contributions to the examine of the boundary layer. this significant paintings will curiosity atmospheric scientists, meteorologists, and scholars and college in those fields.

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Additional info for Atmospheric Boundary Layer Flows: Their Structure and Measurement

Sample text

For a more realistic representation of peaks and valleys in the distribution of turbulent energy, meteorologists use the wavenumber-weighted form K\F(K\) of the spectrum. In Fig. 4 we see K\F(n\) for the u component peaking at K\ w 1/AM while falling off as «*' on the low side and K, 3 on the high side. The low-frequency spectrum can usually be approximated by one of two analytic forms: FIG. 4. Log-log representations of the frequency-weighted and unweighted power spectral densities. We show both plots in the same graph even though the two spectra have different dimensions (variance and variance/unit frequency interval) to compare their behavior as a function of n\.

36 from the Kansas stable data, Moraes( 1988) showed SPECTRA AND COSPECTRA OVER FLAT UNIFORM TERRAIN 45 FIG. 10. Normalized stable surface layer spectrum representing u, v, w, and 9. The abscissa is normalized by the frequency where the inertial subrange slope intercepts the fS(f) = 1 line, as shown in the figure. 3). , 1972) shown in Fig. 11 with minor adjustments to provide the expected 4/3 ratio in the inertial subrange. 6 Mixed layer spectra In the mixed layer, which comprises the upper 9/10 of the CBL, we find M-O similarity being replaced by a different scaling law: with zt replacing —L, w* replacing u*, and #* replacing T*, as we saw in Chapter 1.

When z/L becomes much larger than unity, this local scaling breaks down giving way to buoyant oscillations in the form of gravity waves at frequencies equal to or less than the Brunt-Vaisala frequency N, where 26 ATMOSPHERIC BOUNDARY LAYER FLOWS FIG. 11. , 1979). in units of radians/second. ) These waves, with periods (2n/N) ranging from roughly a minute to an hour, appear prominently in time traces of vertical velocity, temperature, and pressure. , 1984). 5 Budgets of turbulent kinetic energy, temperature variance, and fluxes An examination of the terms in the kinetic energy equation offers some important insights into the nature of turbulent production and destruction in the boundary layer.

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Atmospheric Boundary Layer Flows: Their Structure and Measurement by J. C. Kaimal


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