EurekaMag.com logo
+ Translate

Spectra of concentration fluctuations the two time scales of a meandering plume


, : Spectra of concentration fluctuations the two time scales of a meandering plume. Atmospheric Environment 20(6): 1131-1138

The integral time scale, TC, of the concentration fluctuations in a narrow, meandering (intermittent) plume can be much less than the time scale, TE, of the turbulence in which the plume is immersed, and is generally of the same order of magnitude as the time required for the plume to pass once over a receptor. However the total concentration fluctuation variance is equally strongly influenced by the larger time scale, TE, associated with meandering caused by ambient turbulence. It is shown that observed energy spectra of the concentration fluctuations can be fitted by a linear combination of two Markov spectra, one with the time scale of the meandering motions and another with the time scale of the small scale plume motions. The two components are weighted by I and 1 -I, respectively, where I is the intermittency or fraction of time that non-zero concentrations occur.

(PDF same-day service: $19.90)

Accession: 006459345

DOI: 10.1016/0004-6981(86)90145-9

Submit PDF Full Text: Here


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Luhar, A.K.; Hibberd, M.F.; Borgas, M.S., 2000: A skewed meandering plume model for concentration statistics in the convective boundary layer. The meandering plume technique, which assumes that the total plume dispersion can be split into independent meander and relative dispersion components, is especially suited for modelling concentration (fluctuation) statistics in the convective bou...

Reynolds, Andrew-Michael, 2000: Representation of internal plume structure in Gifford's meandering plume model. Gifford's (1959. Advances in Geophysics 6, 117-138) meandering plume model is extended to account for internal plume structure. The applicability of the model is thereby extended to include the near field of large sources and the far field. A...

Hilderman, T.-; Wilson, D., J., 2007: Predicting plume meandering and averaging time effects on mean and fluctuating concentrations in atmospheric dispersion simulated in a water channel. Plume meandering and averaging time effects were measured directly using a high spatial resolution, high frequency, linescan laser-induced fluorescence (LIF) technique for measuring scalar concentrations in a plume dispersing in a water channel. P...

Hanna S.R., 1984: Concentration fluctuations in a smoke plume. Previous research results were reviewed and used to derive a new set of analytical formulas for predicting concentration fluctuations in smoke plumes. The meandering plume approach and the internal plume approach were compared. Some simple models...

Sawford B.L.; Stapountzis H., 1986: Concentration fluctuations according to fluctuating plume models in one and two dimensions. Concentration probability density functions (pdfs) calculated according to fluctuating plume models in one- and two-dimensions, representing the limiting cases of one-dimensional dispersion from a line source or a point source in strongly anisotro...

Wilson D.J.; Fackrell J.E.; Robins A.G., 1982: Concentration fluctuations in an elevated plume a diffusion dissipation approximation. A Gaussian plume model for the variance of fluctuating concentration about the local mean was developed for an elevated point source in a neutrally stable boundary layer. Local variance production and dissipation in the along wind direction were a...

Schmitz, M.; Tavan, P., 2004: Vibrational spectra from atomic fluctuations in dynamics simulations. II. Solvent-induced frequency fluctuations at femtosecond time resolution. The midinfrared (MIR) spectra of molecules in polar solvents exhibit inhomogeneously broadened bands whose spectral positions are shifted as compared to the gas phase. The shifts are caused by interactions with structured solvation shells and the...

A.V.Glazunov, V.P.Dymnikov, 2013: Spatial spectra and characteristic horizontal scales of temperature and velocity fluctuations in the convective boundary layer of the atmosphere. Using a high-resolution LES numerical model, we calculated the turbulent thermal convection for high ratios of horizontal and vertical sizes of the computational domain (26: 26: 1). The natural analog of the simulated process is a planetary bounda...

Abelson M.; Agnon A., 2003: Two time-scales of pulsation of the Iceland Plume inferred from magnetic anomalies of the North Atlantic. Eos, Transactions, American Geophysical Union 84(46, Suppl

Zeru, A.; Schäfer, G., 2005: Analysis of groundwater contamination using concentration-time series recorded during an integral pumping test: bias introduced by strong concentration gradients within the plume. When only few monitoring wells are available to assess the extent and level of groundwater contamination, inversion of concentration breakthrough curves acquired during an integral pumping test can be used as an alternative quantification method....