1968
DOI: 10.3133/ofr68230
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An optical method for determining particle sizes of coarse sediment

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Cited by 11 publications
(10 citation statements)
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“…Errors from misreading the ruler, or from miscomputing measurements can be avoided by using an optical particle-size analyzer (Ritter and Helley 1969) to measure particle b-axes. This instrument projects an adjustable circle of light onto the photograph of a gravel surface.…”
Section: B-axes Measurements On Photographsmentioning
confidence: 99%
“…Errors from misreading the ruler, or from miscomputing measurements can be avoided by using an optical particle-size analyzer (Ritter and Helley 1969) to measure particle b-axes. This instrument projects an adjustable circle of light onto the photograph of a gravel surface.…”
Section: B-axes Measurements On Photographsmentioning
confidence: 99%
“…Several papers deal with photographic methods of measuring surface grain-size distributions (Ritter and Helley, 1969;Kellerhals and Bray, 1971;Iriondo, 1972;Adams, 1979). The present paper extends this topic.…”
Section: Introductionmentioning
confidence: 99%
“…The particle-size distributions of bed material were determined for the stream cross sections listed in table 3. At stations 131215 and 131225, size was determined from photographs by using the optical method of Ritter and Helley (1969).…”
Section: Bed and Bank Materialsmentioning
confidence: 99%
“…From particle-size counts, the estimated average diameter of bed material at this station was about 40 mm. 1 1 1 1 1 1 2 4 8 13 18 20 22 24 26 30 36 42 1 2 1 5 16 3 3 12 9 2 53 3 1 19 2 9 23 8 10 25 21 7 64 10 4 38 11 18 32 18 27 39 43 21 68 22 12 61 29 44 64 86 82 66 92 68 89 69 54 100 72 92 90 100 100 96 95 95 100 97 84 89 100 128 100 100 100 100 100 181 100 Optical analysis (by method of Ritter and Helley, 1969 Two bank material samples were taken at stations 131225 and in August 1981.…”
Section: Bed and Bank Materialsmentioning
confidence: 99%