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Titolo:
Effects of sediment supply on surface textures of gravel-bed rivers
Autore:
Buffington, JM; Montgomery, DR;
Indirizzi:
US Geol Survey, Div Water Resources, Boulder, CO USA US Geol Survey Boulder CO USA rvey, Div Water Resources, Boulder, CO USA Univ Washington, Dept Geol Sci, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 Dept Geol Sci, Seattle, WA 98195 USA
Titolo Testata:
WATER RESOURCES RESEARCH
fascicolo: 11, volume: 35, anno: 1999,
pagine: 3523 - 3530
SICI:
0043-1397(199911)35:11<3523:EOSSOS>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
BOUNDARY SHEAR-STRESS; MIXED-SIZE SEDIMENT; LOAD TRANSPORT; FINE SEDIMENT; FLUME EXPERIMENT; FLUVIAL GRAVELS; FRICTION ANGLE; ALTERNATE BARS; CHANNEL; STREAMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Buffington, JM US Geol Survey, Div Water Resources, 3215 Marine St,Bldg RL6, Boulder, CO USA US Geol Survey 3215 Marine St,Bldg RL6 Boulder CO USA USA
Citazione:
J.M. Buffington e D.R. Montgomery, "Effects of sediment supply on surface textures of gravel-bed rivers", WATER RES R, 35(11), 1999, pp. 3523-3530

Abstract

Using previously published data from flume studies, we test a new approachfor quantifying the effects of sediment supply (i.e., bed material supply)on surface grain size of equilibrium gravel channels. Textural response tosediment supply is evaluated relative to a theoretical prediction of competent median grain size (D-50'). We find that surface median grain size (D-50') varies inversely with sediment supply rate and systematically approaches the competent value (D-50') at low equilibrium transport rates. Furthermore, equilibrium transport rate is a power function of the difference between applied and critical shear stresses and is therefore a power function of the difference between competent and observed median grain sizes (D-50' andD-50'). Consequently, we propose that the difference between predicted andobserved median grain sizes can be used to determine sediment supply rate in equilibrium channels. Our analysis framework collapses data from different studies toward a single relationship between sediment supply rate and surface grain size. While the approach appears promising, we caution that it has been tested only on a limited set of laboratory data and a narrow rangeof channel conditions.

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Documento generato il 20/09/20 alle ore 23:38:38