منابع مشابه
Calculating bed load transport in steep boulder bed channels
[1] Steep, rough channels occupy a large fraction of the total channel length in mountainous regions. Most sediment mobilized on hillslopes must pass through these streams before reaching lower-gradient channels. Steep channels have wide grain size distributions that are composed of finer, more mobile sediment and large, rarely mobile grains. The large grains can bear a significant portion of t...
متن کاملKinematic wave model for transient bed profiles in alluvial channels under nonequilibrium conditions
[1] Transient bed profiles in alluvial channels are generally modeled using diffusion (or dynamic) waves and assuming equilibrium between detachment and deposition rates. Equilibrium sediment transport can be considerably affected by an excess (or deficiency) of sediment supply due to mostly flows during flash floods or floods resulting from dam break or dike failure. In such situations the sed...
متن کاملThe Effect of Bed Roughness on Depth- Discharge Relations in Alluvial Channels
Alluvial channel stage-discharge and depth-discharge relations were studied in a large sand-bed recirculating flume. From this study, it was found that the form of these relations are intimately related to: 1. Regime of flow 2. Form of bed roughness a. Characteristics of the bed material b. Concentration of fine sediment c. Temperature 3. Rate of change of discharge with time In the range of sh...
متن کاملThe Physical Basis for Anomalous Diffusion in Bed Load Transport
Recent studies have observed deviation from normal (Fickian) diffusion in sediment tracer dispersion that violates the assumption of statistical convergence to a Gaussian. Nikora et al. (2002) hypothesized that particle motion at short time scales is superdiffusive because of inertia, while long-time subdiffusion results from heavy-tailed rest durations between particle motions. Here we test th...
متن کاملVariation in the reference Shields stress for bed load transport in gravel-bed streams and rivers
[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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ژورنال
عنوان ژورنال: La Houille Blanche
سال: 1961
ISSN: 0018-6368,1958-5551
DOI: 10.1051/lhb/1961037