An optical method for determining particle sizes of coarse sediment

Ritter, John R.; Helley, E.J.

doi:10.3133/ofr68230

Cited by 11 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

Sampling surface and subsurface particle-size distributions in wadable gravel-and cobble-bed streams for analyses in sediment transport, hydraulics, and streambed monitoring

Bunte¹,

Abt²

2001

527

553

View full text Add to dashboard Cite

show abstract

Section: B-axes Measurements On Photographsmentioning

confidence: 99%

Sampling surface and subsurface particle-size distributions in wadable gravel-and cobble-bed streams for analyses in sediment transport, hydraulics, and streambed monitoring

Bunte¹,

Abt²

2001

527

553

View full text Add to dashboard Cite

show abstract

“…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%

Photo‐sieving: A method for grain‐size analysis of coarse‐grained, unconsolidated bedding surfaces

Ibbeken

Schleyer

1986

Earth Surf Processes Landf

106

View full text Add to dashboard Cite

The photo-sieving method enables the grain-size analysis of particles > 10 mm from unconsolidated openwork bedding surfaces. The accuracy is equal to the machine-sieving method. The sediment surface is photographed in the field using a camera stand. The enlarged print is digitized for computer processing by tracing the outlines of the pebbles. From the size and shape of the projection area of the individual pebble images the computer determines the ellipsoids of revolution, classifies these ellipsoids, and establishes their grain-size distribution in percentage by weight. Thus photo-sieving differs distinctly from pointcounting techniques. With the aid of photo-sieving, the surface grain-size distributions of larger sedimentary systems may be regularly mapped. Alluvial fans, braided rivers, both onshore and offshore coasts or areas of relict sediments and manganese nodules are suitable for this method.

show abstract

“…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%