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GRADIENT BALANCE [6 records]

Record 1 2022-12-02

English

Subject field(s)
  • Atmospheric Physics
CONT

What the hydrostatic balance is implying is that the vertical motion upwards is equal to the downward motion of gravity. In other words there is a net zero motion in the vertical direction.

CONT

Air does not rush off into space because the upward-directed pressure gradient force is nearly always balanced by the downward force of gravity. When these two forces are in exact balance, the air is said to be in hydrostatic equilibrium.

French

Domaine(s)
  • Physique de l'atmosphère
CONT

On appelle équilibre hydrostatique l'équilibre entre la composante verticale de la force du gradient de pression et la force d'attraction due à la gravité. L'atmosphère est habituellement en équilibre hydrostatique sauf, par exemple, dans le cas du mouvement vertical associé aux orages et dans lequel l'air est accéléré vers le haut ou le bas.

Spanish

Save record 1

Record 2 2015-03-11

English

Subject field(s)
  • Meteorology
DEF

Nearly circular trajectory of an air particle moving horizontally at constant speed relative to the Earth's surface in the absence of a horizontal pressure gradient. Balance is achieved between the Coriolis and centrifugal forces.

French

Domaine(s)
  • Météorologie
DEF

Trajectoire presque circulaire d'une particule d'air se mouvant horizontalement à vitesse constante par rapport à la surface terrestre en l'absence d'un gradient horizontal de pression. L'équilibre s'établit entre la force de Coriolis et la force centrifuge.

Spanish

Campo(s) temático(s)
  • Meteorología
DEF

Trayectoria casi circular de una partícula de aire que se mueve horizontalmente a nivel constante en relación con la superficie terrestre, en ausencia de un gradiente horizontal de presión. El equilibrio se establece entre las fuerzas centrífuga y de Coriolis.

Save record 2

Record 3 2004-10-01

English

Subject field(s)
  • Atmospheric Physics
DEF

Wind with a speed less than the corresponding geostrophic wind speed.

CONT

In the real atmosphere, winds will resemble the geostrophic wind only in regions where the pressure gradient is uniform(i. e. isobars on weather map are straight, parallel to each other). Often, when isobars are curved or when they converge/diverge..., the real wind will be faster than(super-geostrophic) or slower than(sub-geostrophic) winds resulting from gestrophic balance.

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Vent de vitesse inférieure à celle du vent géostrophique correspondant.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
DEF

Viento con una velocidad inferior a la del viento geostrófico correspondiente.

Save record 3

Record 4 2002-06-17

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
CONT

Another very clever way-out was pioneered by the blind physicist Plateau already in the XIX century : the isodense tank(Plateau tank) with an immiscible liquid to balance the(high) hydrostatic gradient. But on both cases(millimetric-size liquid bridges and Plateau simulation) the mechanical behaviour(statics and dynamics) of liquid bridges is difficult to investigate under ground conditions because both techniques make experimentation difficult, imprecise and can mask effects only measurable under reduced gravity conditions. That explains why so many experiments with liquid bridges have been performed under microgravity since the pioneering demonstrations in Skylab in 1974, and how different the real behaviour of liquid bridges in space has been found.

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
OBS

Avec deux liquides de même densité, on reconstitue une sorte de pesanteur.

Spanish

Save record 4

Record 5 2002-04-08

English

Subject field(s)
  • Ecology (General)
  • Biogeography
  • Climatology
CONT

Because of its size, Quebec has a wide array of climates and vegetation zones; climatic variations and a broad range of soil types have resulted in distinctive bioclimatic regions.

CONT

Sinuosity, width/depth ratio, and gradient are in balance with the landscape setting(i. e., landform, geology, and bioclimatic region).

OBS

Compare with "ecological region", a closely-related concept.

French

Domaine(s)
  • Écologie (Généralités)
  • Biogéographie
  • Climatologie
CONT

En raison de son étendue, on observe au Québec plusieurs climats et zones de végétation. La diversité climatique et la variété de types de sols entraînent l'existence de régions bioclimatiques ayant des caractéristiques très différenciées.

CONT

Le stage [intégré d'écologie] est centré sur la région bioclimatique ardennaise mais fera cependant très largement appel à des comparaisons avec des sites de régions limitrophes contrastées (Condroz, Famenne et Gaume).

Spanish

Save record 5

Record 6 1991-04-12

English

Subject field(s)
  • Glaciology
DEF

A flow pattern on glaciers in which the velocity decreases with distance downstream; thus the longitudinal strain rate(velocity gradient) is compressive. This condition requires a transverse or vertical expansion, or a negative net balance on the surface, because ice is almost incompressible.

OBS

Ant.: extending flow

French

Domaine(s)
  • Glaciologie
DEF

Type d'écoulement des glaciers caractérisé par une diminution de la vitesse en fonction de la distance vers l'aval.

CONT

Les dépôts glacio-marins indiquent le vêlage d'icebergs au front du glacier (écoulement en extension) tandis que le till en écailles définit au contraire une moraine de cisaillement, caractéristique d'un écoulement en compression de la glace frontale.

Spanish

Save record 6

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