TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
ROUNDNESS VALUE [1 record]
Record 1 - internal organization data 2011-07-26
Record 1, English
Record 1, Subject field(s)
- Geology
- Petrography
Record 1, Main entry term, English
- roundness index
1, record 1, English, roundness%20index
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- roundness value 1, record 1, English, roundness%20value
correct
- roundness ratio 2, record 1, English, roundness%20ratio
- degree of roundness 3, record 1, English, degree%20of%20roundness
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The ratio of the average radius of curvature of the corners of a particle to the radius of the maximum inscribed circle. 1, record 1, English, - roundness%20index
Record number: 1, Textual support number: 1 OBS
The roundness value of a perfectly rounded particle is 1. 0, whereas the roundness value of less-rounded particles is smaller than 1. 0. 1, record 1, English, - roundness%20index
Record 1, French
Record 1, Domaine(s)
- Géologie
- Pétrographie
Record 1, Main entry term, French
- indice d'émoussé
1, record 1, French, indice%20d%27%C3%A9mouss%C3%A9
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- indice d'arrondi 2, record 1, French, indice%20d%27arrondi
correct, masculine noun
- rapport d'arrondi 3, record 1, French, rapport%20d%27arrondi
correct, masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Évaluation quantitative du degré d'usure des galets. 4, record 1, French, - indice%20d%27%C3%A9mouss%C3%A9
Record number: 1, Textual support number: 1 CONT
L'indice d'émoussé reflète les usures subies par le galet; «c'est un enregistreur global de la somme des actions érosives auxquelles a été soumis le matériel détritique» (A. Cailleux). On le mesure à l'aide d'une cible ou de calibres spéciaux [...] 5, record 1, French, - indice%20d%27%C3%A9mouss%C3%A9
Record number: 1, Textual support number: 2 CONT
Les cailloux, roulés sur le fond du lit, émoussent leurs angles assez rapidement, après quelques kilomètres; mais les galets se fragmentent, obligeant la rivière à recommencer toujours le même travail. Les valeurs de l'indice d'émoussé restent donc moyennes, entre 100 et 300, rarement 500, et ne fournissent que le rapport d'équilibre entre l'usure et la fragmentation [...] 5, record 1, French, - indice%20d%27%C3%A9mouss%C3%A9
Record number: 1, Textual support number: 3 CONT
L'indice d'émoussé : 2 r'/L où r' est le plus petit rayon de courbure du contour apparent du galet mesuré dans le plan contenant L. Il donne une idée de l'état d'usure du galet. Il varie de 0 (objet anguleux) à 1 (sphère ou cylindre aplati). 6, record 1, French, - indice%20d%27%C3%A9mouss%C3%A9
Record 1, Spanish
Record 1, Textual support, Spanish
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