ON DIFFUSION FROM A CONTINUOUS POINT SOURCE AT GROUND LEVEL INTO A TURBULENT ATMOSPHERE

1954 ◽  
Vol 7 (2) ◽  
pp. 168-178 ◽  
Author(s):  
D. R. DAVIES
Keyword(s):  
Point Source ◽  
Turbulent Atmosphere ◽  
Ground Level ◽  
Continuous Point

scholarly journals An Analytical Simple Formula for the Ground Level Concentration from a Point Source

Atmosphere ◽  
2011 ◽  
Vol 2 (2) ◽  
pp. 21-35 ◽  
Author(s):  
Tiziano Tirabassi ◽  
Alessandro Tiesi ◽  
Marco T. Vilhena ◽  
Bardo E.J. Bodmann ◽  
Daniela Buske
Keyword(s):  
Point Source ◽  
Simple Formula ◽  
Ground Level ◽  
Ground Level Concentration

3.2 GROUND SYSTEMS FOR RELEASING TRICHOGRAMMA MINUTUM RILEY IN PLANTATION FORESTS

1990 ◽  
Vol 122 (S153) ◽  
pp. 31-37 ◽  
Author(s):  
S.M. Smith ◽  
D.R. Wallace
Keyword(s):  
Sex Ratio ◽  
Point Source ◽  
Ground Level ◽  
Egg Parasitoid ◽  
Forest Stands ◽  
Plantation Forests ◽  
Trichogramma Minutum ◽  
Two Systems ◽  
Ground Systems

AbstractTwo systems for releasing the egg parasitoid, Trichogramma minutum Riley, from ground level in forest stands are described: (1) a gridded point-source release using parasitized host eggs attached to cards, and (2) a hand-held leafblower distributing parasitized eggs in bulk. Neither technique affected the emergence of the parasitoids released. Parasitoids emerging from eggs released in bulk had a similar sex ratio, longevity, and fecundity to those not released. Both methods of ground release achieved uniform parasitoid distribution and resulted in levels of parasitism similar to those achieved with aerial releases. Parasitism was greater in the mid- to upper canopy of trees than in the lower canopy. The difficulties associated with each technique and its comparative usefulness in experimental and operational programs are discussed.

Mass Diffusion From a Point Source in a Neutral Turbulent Shear Layer

1977 ◽  
Vol 99 (3) ◽  
pp. 433-438 ◽  
Author(s):  
K. S. Rao ◽  
V. W. Nee ◽  
K. T. Yang
Keyword(s):  
Point Source ◽  
Shear Layer ◽  
Turbulent Viscosity ◽  
Ground Level ◽  
Mass Diffusion ◽  
Turbulent Shear ◽  
Governing Equations ◽  
Turbulent Shear Layer ◽  
Eddy Diffusivities ◽  
Neutral Surface Layer

An investigation of the diffusion of pollutants in neutral surface layer of atmosphere is analyzed here based on a simple phenomenological differential field theory of turbulent shear flows. The variation of the effective turbulent viscosity is governed by a rate equation. The analytical model studied in this work consists of mass diffusion from a continuous crosswind point source at ground level in a turbulent shear layer. The system of governing equations is solved by finite-differences giving the pollutant distributions, eddy diffusivities, and velocity profiles at various downstream locations for various initial and boundary conditions. The computed diffusion data are presented and compared favorably with the available experimental results.

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