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Titolo:
Sampling frame for improving pebble count accuracy in coarse gravel-bed streams
Autore:
Bunte, K; Abt, SR;
Indirizzi:
Colorado State Univ, Engn Res Ctr, Ft Collins, CO 80523 USA Colorado StateUniv Ft Collins CO USA 80523 Ctr, Ft Collins, CO 80523 USA
Titolo Testata:
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
fascicolo: 4, volume: 37, anno: 2001,
pagine: 1001 - 1014
SICI:
1093-474X(200108)37:4<1001:SFFIPC>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE-SIZE ANALYSIS; CLASTIC SEDIMENTS; VARIANTS; PURPOSE; KONDOLF,G.MATHIAS;
Keywords:
erosion; sedimentation; watershed management/wildland hydrology; sampling gravel-bed streams; operator error; biased particle selection; adjustable sampling spacing; sampling pattern;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
K. Bunte e S.R. Abt, "Sampling frame for improving pebble count accuracy in coarse gravel-bed streams", J AM WAT RE, 37(4), 2001, pp. 1001-1014

Abstract

Improved sampling techniques are needed to increase the accuracy of pebble-count particle-size distributions used for stream studies in gravel-bed streams. However, pebble counts are prone to operator errors introduced through subjective particle selection, serial correlation, and inaccurate particle-size measurements. Errors in particle-size measurements can be minimizedby using a gravel template. Operator influence on particle selection can be minimized by using a sampling frame, 60 by 60 cm, in which sampling points are identified by the cross points of thin elastic bands. Serial correlation can be minimized by adjusting the spacing between the cross points and setting it equal to the dominant large particle size (approximate toD(95)). In a field test in a cobble-bed stream, the sampling frame developed in this study produced slightly coarser size distributions, particularly in the cobble range, than the traditional heel-to-toe walk that selects particles with a blind touch at the tip of the boot. The sampling frame produced moresimilar sampling results between two operators than heel-to-toe walks. Thedifference between the two sampling methods is attributed to an unbiased selection of fine and coarse particles when using the sampling frame.

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Documento generato il 11/07/20 alle ore 17:42:33