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SLOPE INSTABILITY [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-09-13

English

Subject field(s)
  • Soil Mechanics (Engineering)
CONT

Water in this disturbed ground could move along the pipe or parallel to it, potentially resulting in erosion or slope instability.

French

Domaine(s)
  • Mécanique des sols

Spanish

Save record 1

Record 2 2010-12-22

English

Subject field(s)
  • Soil Science
  • Geology
DEF

The topmost layer of soil that is subject to freeze/thaw alternations and lies above the permafrost.

CONT

The active layer overlies the permafrost, and comprises earth materials that thaw from the surface and refreeze each year. It forms the interface between permafrost and the atmosphere and biosphere. The thickness of the active layer influences vegetation and soil conditions, thereby influencing hunting, gathering, forestry and agriculture. Thickness, texture and moisture content of the active layer affects foundation conditions, transportation and construction. Changes in the active layer can contribute to problems of slope instability, with subsequent impact on transportation facilities and other structures. Therefore, it is important to understand the manner in which the active layer varies locally and regionally, and to understand its response to environmental change.

OBS

permafrost: Permanently frozen ground; generally with reference to a permanently frozen layer at some depth below the ground surface.

OBS

active layer: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Science du sol
  • Géologie
DEF

Couche superficielle du sol soumise aux alternances de gel et de dégel au-dessus d'un pergélisol.

CONT

Le mollisol repose sur le pergélisol et, d'autre part, l'atmosphère et la biosphère. L'épaisseur du mollisol influe sur la végétation et les conditions du sol, et par conséquent sur la chasse, la cueillette, la foresterie et l'agriculture. L'épaisseur, la texture et la teneur en humidité du mollisol influent sur la stabilité des fondations, le transport et la construction. Les changements subis par le mollisol peuvent causer l'instabilité des talus et avoir des répercussions sur les installations de transport et d'autres structures. Il est donc important de comprendre comment varie, à l'échelle locale et régionale, le mollisol et la façon dont il réagit aux changements environnementaux.

CONT

L'envergure des dommages aux infrastructures dans le Nord du Québec causés par tout changement dans la couche active du pergélisol, sa capacité portante et l'instabilité des versants et du relief doit être évaluée [...]

OBS

mollisol : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 2

Record 3 2006-10-26

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
CONT

The size (mass) of snow avalanches depends on the amount of snow that releases initially in the starting zone, plus the amount entrained (picked up) or deposited during downslope motion. ... The mass of snow avalanches varies from small amounts occurring as a result of sluffs to deep slabs with long continuous fracture lines up to about one million tonnes (order of magnitude).

CONT

An avalanche's size and destructive potential depend on several factors including : the amount of snow available, the terrain and its vegetative cover, the steepness of the slope, and the instability of the snowpack. Weather factors also play key roles in the initiation and ultimate severity of an avalanche.

CONT

What was the avalanche size of that release? [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

The term avalanche class is replaced by the term avalanche size; avoid its use even though it is still encountered occasionally.

OBS

avalanche size; size: terms officially approved by the Avalanche Bulletin Terminology Standardization Committee.

Key term(s)
  • snow avalanche size

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Étendue de l'avalanche, classée selon la longueur de l'écoulement, le volume et les dommages potentiels.

CONT

Quelle est la taille de cette avalanche ? [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

La taille de l'avalanche concerne surtout le volume de neige (ou d'aérosol) mis en jeu par l'avalanche. L'intensité d'une avalanche est un terme surtout utilisé par les ingénieurs et chercheurs en protection paravalanche. Une avalanche intense est une avalanche dont les caractéristiques dynamiques sont élevées : vitesse, pression, pouvoir destructeur.

OBS

taille de l'avalanche : terme uniformisé par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 3

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