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TILT BOARD TEST [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2009-01-30

English

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

The shovel shear test provides information about the location where the snow could fail in shear. It is best applied for identification of buried weak layers and does not usually produce useful results in layers close to the snow surface. Soft snow near the surface is better tested with the tilt board and the shear frame or an improvised version of this tilt test.

CONT

Shovel Shear Test. This test can be done on a flat or on a slope. With good technique, the location of weak layers, even thin weak layers, can be found. First dig a hole or pit in the snow. The vertical wall of the pit should be straight up and down, and smooth. Make a mark on the uphill portion of one corner of your pit with your shovel blade. This will mark the boundaries of your column, which should be roughly 30 cm by 30 cm or 12 inches square. (A) Now, cut both sides using a snow saw or your ski, all the way to the floor of the pit making sure that the cuts are straight. (B) The back of the column should only be cut as deep as your shovel blade is long, so measure with your shovel blade (C) and then cut the back. (D) Next, insert your shovel, blade down, in the back cut of the column and pull gently and evenly forward being careful not to lever your shovel handle. (E) Examine the shear layer where the block failed. (F) The force applied to the shovel that causes a weak layer to shear from the layers surrounding it can be rated as follows: Very easy ... Easy ... Moderate ... Hard ...

CONT

The results of the shovel shear test were inconclusive. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

Shovel test: abbreviated form of "shovel shear test." Shovel test may also refer to the shovel tilt test or the shovel compression test.

OBS

Observers are cautioned that identification of the weak layers is the primary objective of the shovel shear test. The shovel shear test is not a stability test.

OBS

shovel shear test: term officially approved by the Avalanche Bulletin Terminology Standardization Committee.

French

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

Le test de la pelle consiste à isoler une tranche du manteau neigeux de base carrée (la largeur est celle de la pelle, soit une trentaine de centimètres en moyenne), puis à la tirer vers soi ou à la charger pour détecter la présence de plan(s) de glissement potentiel(s).

CONT

Le test de cisaillement à la pelle n'a pas donné de résultats définitifs. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

[Ce test n'est] pas à proprement parler un test de stabilité.

OBS

Test de la pelle. [...] Il existe plusieurs variantes de ce test sous la même désignation. Méthode Faarlund. [...] Méthode de Munter.

OBS

test de cisaillement à la pelle; essai de cisaillement à la pelle : termes uniformisés par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 1

Record 2 2009-01-30

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
DEF

A test... used to measure the shear strength of weak snow layers that have been identified either by eye, by finger touch, or with the shovel-shear test, tilt board, or Rutschblock test.

CONT

Shear-Frame Test. ... The equipment required is a shear frame and a pull gauge. ... After the weak layer is marked at a fresh pit wall, the snow is removed above the weak layer (about 5 cm for the 0.01-m² frame). The shear frame is then pressed gently into the snow with the edge parallel to and a few millimeters above the weak layer. With the gauge attached to the frame, a pull is applied rapidly until shear failure occurs. The shear frame index is the force at failure (read on a maximum pointer of the gauge) divided by the cross-sectional area of the frame.

CONT

The shear frame test identified new snow instabilities. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

A shear frame is a rectangular metal frame with thin cutting edges and crossbars. Frames of a cross-sectional area 0.01, 0.025, or 0.05 m² have proven most convenient.

OBS

shear frame test: term officially approved by the Avalanche Bulletin Terminology Standardization Committee.

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
CONT

Le test avec cadre de cisaillement a révélé des instabilités dans la nouvelle neige. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

La mesure de la résistance au cisaillement se fait à l'aide d'instruments spécifiques : le cadre de cisaillement et le scissomètre. Le scissomètre est le plus utilisé en France [...] Lorsque l'épaisseur de la couche est faible (de l'ordre du cm ou du mm), il est nécessaire d'utiliser un cadre de cisaillement : cet appareil est généralement composé d'un cadre rigide muni de peignes. De plus contrairement au scissomètre, une surcharge normale peut être appliquée (manuellement). Pour les deux appareils, on mesure la force ou le couple provoquant la rupture de l'échantillon et on en déduit la contrainte maximale, appelée résistance au cisaillement.

OBS

test avec cadre de cisaillement; essai avec cadre de cisaillement : termes uniformisés par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 2

Record 3 2006-08-29

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
CONT

Tilt-board tests done at treeline this morning produced a clean and fast failure on the surface hoar crystals at this interface. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

tilt-board test; tilt test : terms officially approved by the Avalanche Bulletin Terminology Standardization Committee.

Key term(s)
  • tilt board test

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
CONT

Ce matin, les tests sur planche inclinée effectués à la limite forestière ont donné une rupture nette et rapide dans les cristaux de givre de surface de cette interface. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

test sur planche inclinée; essai sur planche inclinée : termes uniformisés par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 3

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