TERMIUM Plus®

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SOIL SUCTION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2003-04-30

English

Subject field(s)
  • Soil Science
  • Soil Mechanics (Engineering)
  • Hydrology and Hydrography
DEF

Negative pore pressure created by capillary attraction in fine soils and in unsaturated soils.

CONT

Soil suction [means] water pressure within a soil which is less than atmospheric pressure.

OBS

Suction is directly related to pore size and, hence capillarity and may be measured by tensiometer, suction or pressure plate, pressure membrane apparatus or vapour absorption methods.

Key term(s)
  • soil succion

French

Domaine(s)
  • Science du sol
  • Mécanique des sols
  • Hydrologie et hydrographie
DEF

Pression négative par rapport à la pression atmosphérique, à laquelle est soumise l'eau retenue dans un milieu poreux non saturé (et dans la frange capillaire) sous l'effet des forces capillaires.

CONT

Les racines extraient l'eau du sol par succion osmotique, causée par les sels dissous dans leurs tissus. Le sol, quant à lui, retient l'eau par succion capillaire. Cette succion est d'autant plus forte que le sol est plus sec. Il y a donc compétition entre le sol et les racines pour aspirer l'eau. [...] Les sols à texture fine (argiles, limons) ont des interstices plus petits et un rapport surface/volume des particules plus élevé que les sols à texture plus grossière (sables). Ils exercent donc sur l'eau une plus grande succion capillaire.

CONT

Succion. Le terme succion du sol est utilisé pour désigner un déficit de pression (inférieur à la pression atmosphérique), une pression négative de l'eau des pores (Silvai, 1966). Par opposition aux pressions positives des pores, la succion du sol peut varier dans un très large éventail : la pression de l'eau des pores oscille, généralement en mécanique des sols, entre 0 à 500 kPa, et la succion du sol varie de 0 et 100 MPa.

OBS

pression capillaire; tension capillaire; pression de succion; déficit de pression : Les auteurs du «Dictionnaire français d'hydrogéologie» ne recommandent pas l'usage de ces termes qui sont jugés inutiles, impropres ou ambigus (pluralité de sens). Leur emploi est particulièrement déconseillé.

Spanish

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Record 2 2003-04-24

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Soil Science
  • Hydrology and Hydrography
DEF

A measure of the force of water retention in unsaturated soil.

CONT

Soil suction is equal to a force per unit area that must be exceeded by an externally applied suction to initiate water flow from the soil. Soil suction is expressed in pounds per square inch.

CONT

Tensiometers measure soil tension. This is also often referred to as soil suction or vacuum. Soil tension is a measure of how tightly water is held in the soil, and is measured in pressure units of centibars (cb) or kilopascals (kPa). These are equivalent units. One hundred centibars equal approximately 15 psi. Soil tension increases as moisture in the soil is depleted. This force also draws water out of the tensiometer through its porous tip, creating a vacuum inside the tensiometer. This negative pressure, or tension, is registered on the tensiometer vacuum gauge. The soil tension measured with tensiometers is an indirect indication of soil moisture content and can be used as an indicator of irrigation need.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Science du sol
  • Hydrologie et hydrographie
CONT

L'augmentation de la densité du sol diminue la conductivité hydraulique pour des succions inférieures à -30 kPa.

Spanish

Save record 2

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