Development and calibration of a pressure-difference bedload sampler

Helley, E.J.; Smith, Winchell

doi:10.3133/ofr73108

Cited by 240 publications

(182 citation statements)

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“…Samples of bedload were collected using a pressure-difference bedload sampler (Helley and Smith, 1971). The body of the sampler is constructed of 1/4-inch thick cast aluminum with an expansion ratio of 3.22 and fitted with a catch bag of 0.25 mm nylon mesh.…”

Section: Bedload Measurementsmentioning

confidence: 99%

Gravel-Bed Rivers VI: From Process Understanding to River Restoration

Habersack

Piégay

Rinaldi

2007

Developments in Earth Surface Processes

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Sediment transport rates (dissolved, suspended, and bedload) measured over the course of several years are reported for two streams in the Gros Ventre Mountain range in western Wyoming, USA: Little Granite and Cache Creeks. Both streams drain watersheds that are in relatively pristine environments. The sites are about 20 km apart, have runoff dominated by snowmelt and are underlain by a similar geological setting, suggesting that sediment supply and rates of transport in the two watersheds may be comparable. Yet, estimated sediment yields for the two sites appear substantially different. On average, sediment load per unit watershed area was about 40% greater at Little Granite Creek than Cache Creek, with larger differences during wetter years. Moreover, while there were differences for all components of the sediment load, suspended, and bedload fractions showed the most noteworthy contrast where nearly three times more material was exported from Little Granite Creek on an annual basis. Speculatively, this is attributed to contributions of sediment from several chronic sources in the Little Granite Creek watershed.Similar to other studies of sediment transport in gravel-bed streams, the range of measured bedload and suspended sediment in this study were quite variable. An assessment of annual differences in the 13 years of bedload record for Little Granite Creek indicated that variability could not be ascribed to between-year differences. Instead, the data appear to represent the same population of highly variable transport rates. However, the inability to distinguish between years could be due to the infrequency with which data were collected each year. Seasonal variability was evident in the suspended sediment record of Little Granite Creek where there were higher rates on the rising limb of the snowmelt hydrograph, indicative of a flushing of sediment with the onset of snowmelt.Baseline data on rates of sediment transport provide useful information on the inherent variability of stream processes and may be used to assess departure due to natural or anthropogenic disturbances. In August 2000, wildfire burned portions of E-mail addresses: sryanburkett@fs.fed.us (S.E. Ryan) ISSN: 0928-2025 DOI: 10.1016/S0928-202511134-2 the Little Granite Creek watershed, presenting an opportunity to quantify increases in sediment loads associated with large-scale disturbance. The results of 3 years of postfire monitoring showed substantial increases in suspended sediment transport on the rising limb of the snowmelt hydrograph and during several summer thunderstorms. Suspended sediment yields calculated for the post-fire years were higher for the first year and have decreased over time, indicating a return to baseline levels within a few years following the wildfire. In contrast, there were no detectable increases in the rate of bedload transport over the pre-burn values suggesting differences in the rapidity with which the two sediment components respond to disturbance.

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Section: Bedload Measurementsmentioning

confidence: 99%

Gravel-Bed Rivers VI: From Process Understanding to River Restoration

Habersack

Piégay

Rinaldi

2007

Developments in Earth Surface Processes

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“…For the storm on February 25, 1986, the computed gravel discharge is considered satisfactory, whereas the measured value is probably too low. The measured gravel discharge was estimated from the amount of material collected by a Helley-Smith bedload sampler with a 6-inch by 6-inch square inlet (Helley and Smith, 1973;Druffel and others, 1976;Emmett, 1980). The samples collected with this instrument during the high 17,000-cubic-feetper-second discharge of the storm contained large percentages of sand and finer material.…”

Section: Comparison Of Computed and Measured Instantaneous Sediment Dmentioning

confidence: 99%

Sediment transport in the lower Puyallup, White, and Carbon Rivers of western Washington

Sikonia¹

1990

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“…The frequency of each size interval is the percentage, by number, of the 100 rocks or particles in the original sample that fall in the interval. A USGS bedload sampler is to be used at streams that may have live-bed scour at high flow to determine the size of the bed material in motion (Helley and Smith, 1971).…”

Section: Flood Datamentioning

confidence: 99%

Measurement of bridge scour at selected sites in New York, excluding Long Island

Butch¹

1991

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Development and calibration of a pressure-difference bedload sampler

Cited by 240 publications

References 0 publications

Gravel-Bed Rivers VI: From Process Understanding to River Restoration

Gravel-Bed Rivers VI: From Process Understanding to River Restoration

Sediment transport in the lower Puyallup, White, and Carbon Rivers of western Washington

Measurement of bridge scour at selected sites in New York, excluding Long Island

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