Effects of Sand Addition and Bed Flushing on Gravel Bed Surface Microtopography and Roughness
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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Field characterization of gravel-bed surface structure is important for studies on flow resistance, sediment transport and in-stream habitats. The following study presents technical developments that make obtaining highresolution digital elevation models (DEMs) from gravel beds in the field more efficient and effective. Using close-range digital photogrammetry (CRDP), only two consumer-grade di...
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[1] Migrating bed forms strongly influence hydraulics, transport, and habitat in river environments. Their dynamics are exceedingly complex, making it difficult to predict their geometry and their interaction with sediment transport. Acoustic instrumentation now permits high-resolution observations of bed elevation as well as flow velocity. We present a space-time characterization of bed elevat...
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[1] In this work we combine existing ideas on gravel and sand entrainment into a simulation model for flows that flush sand from the surface and subsurface of a gravel riverbed. A flume experiment is conducted to provide a test of the flushing model. The primary advance represented in this paper is incorporation of a two-fraction entrainment approach into a routing model to account for the effe...
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ژورنال
عنوان ژورنال: Water Resources Research
سال: 2019
ISSN: 0043-1397,1944-7973
DOI: 10.1029/2018wr024615