TERMIUM Plus®

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DOWNWIND DISTANCE [6 records]

Record 1 2012-10-15

English

Subject field(s)
  • Environmental Studies and Analyses
  • Air Pollution
CONT

Even supposing that the plume rises were a clear concept, and its value correctly known, we still have the enormous variations in the spreading of known passive plume.

CONT

Plume Geometry and Rise. Once a puff is released from a point source it will move away from it with a speed and direction determined by the wind.

CONT

At the request of member utilities, EPRI is managing a multi-year collaborative applied research effort focused on developing improved plume rise and downwash sub-models for incorporation into regulatory air quality dispersion models.... A field measurements program was performed from February 10-March 5, 1994 to characterize plume rise and building-induced downwash at a representative combustion turbine facility, under a variety of meteorological conditions.... PRIME [Plume Rise Model Enhancements] explicitly calculates the local slope of the mean streamlines as a function of building shape and wind angle, and coupled with a numberical plume rise model, determines the change in plume centerline location with downwind distance.

PHR

To characterize plume rise, to computer plume rise in models, to develop plume rise models, to develop plume rise modules, to evaluate plume rise modules.

PHR

Numerical plume rise model.

PHR

Plume rise algorithms, plume rise models, plume rise modules.

Key term(s)
  • plume-rise

French

Domaine(s)
  • Études et analyses environnementales
  • Pollution de l'air
DEF

Différence de niveau observée entre le point d'émission des panaches et la hauteur qu'ils atteignent sous l'effet du gradient thermique et de leur énergie cinétique.

CONT

[...] à cause de sa poussée et de sa vitesse, le panache s'élève jusqu'à une certaine hauteur au-dessus de la cheminée, appelée l'élévation du panache, et il se disperse [...], retombant éventuellement sur le sol.

CONT

Diffusion pour sources ponctuelles. Le modèle gaussien : classes de stabilité, coefficients de dispersion. L'élévation du panache. Rabattement, élévation du terrain, proximité d'une masse d'eau et présence d'inversion.

Spanish

Campo(s) temático(s)
  • Estudios y análisis del medio ambiente
  • Contaminación del aire
CONT

Fórmulas de elevación del penacho. La altura del penacho se usa en los cálculos del término Vertical. Las ecuaciones de cantidad de movimiento en la elevación del penacho dependientes de la distancia, como se describe en (Bowers, et al., 1979), se usan para determinar si el penacho resulta afectado por apantallamientos para los cálculos de bañado de edificios.

Save record 1

Record 2 2007-03-28

English

Subject field(s)
  • Atmospheric Physics
DEF

Generally, the effect of any lake in modifying the weather about its shore and for some distance downwind.

OBS

In the United States ... More specifically, lake effect often refers to the generation of sometimes spectacular snowfall amounts to the lee of the Great Lakes as cold air passes over the lake surface, extracting heat and moisture, resulting in cloud formation and snowfall downwind of the lake shore.

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Effet d'un lac sur ses rives au point de vue temps et climat.

Spanish

Save record 2

Record 3 2005-01-19

English

Subject field(s)
  • Aircraft Piloting and Navigation
  • River and Sea Navigation
CONT

The carrier landing pattern is similar in some ways to the type of pattern you would use at a land-based field. The major differences lie in the fact that at sea, there are few or no good reference points to judge your position relative to the ship. For example, on your downwind leg, rather than having a nice long parallel section of runway to judge your distance abeam, you only have a fleeting glance at the ship to judge whether you are too close or too far away.

French

Domaine(s)
  • Pilotage et navigation aérienne
  • Navigation fluviale et maritime
CONT

Toutefois, le courant, qui portait grosso modo au nord-est, avait fait dériver le navire d'environ 220 m dans cette direction. La distance par le travers entre l'avant du navire au mouillage et la rive rocheuse de Admiralty Point était d'environ 525 m.

Spanish

Save record 3

Record 4 2001-10-30

English

Subject field(s)
  • Air Pollution
  • Environmental Studies and Analyses
  • Atmospheric Physics
CONT

[For a vapour released continuously from a point source at a constant rate the concentration at a point, x, y, z downwind of the source at height h, is given by the following Gaussian Plume equation] where x=downwind distance, y=vertical distance, z=vertical distance....

French

Domaine(s)
  • Pollution de l'air
  • Études et analyses environnementales
  • Physique de l'atmosphère
OBS

Manuel d'introduction, 5.3.2.3.

OBS

Nuisances dues aux activités urbaines, p. 110/14; La pollution atmosphérique, Détrie, p. 208.

Spanish

Campo(s) temático(s)
  • Contaminación del aire
  • Estudios y análisis del medio ambiente
  • Física de la atmósfera
Save record 4

Record 5 1986-06-26

English

Subject field(s)
  • Air Pollution
  • Atmospheric Physics
CONT

These relationships are contained in the subroutine 51G4A, which, given the stability class and downwind distance(x), affords values of [sigma subscript y and sigma subscript z].

French

Domaine(s)
  • Pollution de l'air
  • Physique de l'atmosphère

Spanish

Save record 5

Record 6 1986-06-02

English

Subject field(s)
  • Air Pollution
CONT

For a vapour released continuously from a point source at a constant rate the concentration at a point, x, y, z downwind of the source at height h, is given by the following Gaussian Plume equation... where C=concentration of vapour... U=wind speed... X=downwind distance... y=crosswind distance... z=vertical distance....

French

Domaine(s)
  • Pollution de l'air
OBS

Nuisances dues aux activités urbaines, p. 108/12.

OBS

"distance latérale" : Chovin et Roussel, 1978, p. 17.

Spanish

Save record 6

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