Mobilization of coarse surface layers in gravel-bedded rivers by finer gravel bed load
نویسندگان
چکیده
منابع مشابه
Equivalent roughness of gravel-bed rivers
The relation between the equivalent roughness and different grain size percentiles of the sediment in gravel-bed rivers was determined under the hypothesis that the vertical distribution of the flow velocity follows a logarithmic law. A set of 954 data points was selected from rivers with gravel size sediment or larger, with a non-sinuous alignment and free of vegetation or obstacles. According...
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[1] The present study examines variations in the reference shear stress for bed load transport (tr) using coupled measurements of flow and bed load transport in 45 gravel-bed streams and rivers. The study streams encompass a wide range in bank-full discharge (1–2600 m/s), average channel gradient (0.0003–0.05), and median surface grain size (0.027–0.21 m). A bed load transport relation was form...
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[1] A variety of formulae has been developed to predict bed load transport in gravel bed rivers, ranging from simple regressions to complex multiparameter formulations. The ability to test these formulae across numerous field sites has, until recently, been hampered by a paucity of bed load transport data for gravel bed rivers. We use 2104 bed load transport observations in 24 gravel bed rivers...
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Bankfull discharge was identified in some 30 gravel-bed rivers representing in total c. 40 gauging stations. The catchment sizes vary from 4km2 to nearly 2700km2. Bankfull discharge value increases with basin size. In the case of gravel-bed rivers developed on an impermeable substratum, the following equation emerges: Qb=0·087 A 1·044. Bankfull discharge recurrence interval was determined by fi...
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(1) Fluvial Dynamics Research Group (RIUS); www.fluvialdynamics.com. Departament de Medi Ambient i Ciències del Sòl (DMACS), Universitat de Lleida, E-25198, Lleida, Catalunya, España, [email protected] (2) Centre Tecnològic Forestal de Catalunya, E-25280, Solsona (Lleida), Catalunya, España (3) Institute of Geography and Earth Sciences, Aberystwyth University, Ceredigion SY23 3DB, Wales, UK...
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ژورنال
عنوان ژورنال: Water Resources Research
سال: 2010
ISSN: 0043-1397
DOI: 10.1029/2009wr008329