Estimating critical stream power for bedload transport calculations in gravel-bed rivers
The physical basis of Bagnold's equation for critical stream power is examined. Although the general approach is well founded, the original equation can be criticised for (1) failing to distinguish between the grain size in transport and the grain size that represents bed roughness; (2) requiri...
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| Veröffentlicht in: | Geomorphology (Amsterdam, Netherlands) Netherlands), 2005-08, Vol.70 (1), p.33-41 |
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| container_title | Geomorphology (Amsterdam, Netherlands) |
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| creator | Ferguson, R.I. |
| description | The physical basis of Bagnold's equation for critical stream power is examined. Although the general approach is well founded, the original equation can be criticised for (1) failing to distinguish between the grain size in transport and the grain size that represents bed roughness; (2) requiring a knowledge of critical flow depth in addition to gross channel properties; (3) failing to allow for hiding and protrusion effects on the mobility of mixed-size stream beds. More general equations are presented which overcome these limitations. They require a knowledge of channel slope, but not depth. The analysis suggests that the presence of form resistance in addition to grain roughness does not affect the calculation of critical power. Critical power is expected to depend more sensitively on grain size between reaches than within reaches. |
| doi_str_mv | 10.1016/j.geomorph.2005.03.009 |
| format | Article |
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| ispartof | Geomorphology (Amsterdam, Netherlands), 2005-08, Vol.70 (1), p.33-41 |
| issn | 0169-555X 1872-695X |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Bgi / Prodig Earth sciences Earth, ocean, space Entrainment Exact sciences and technology Fluvial forms and processes Freshwater Geomorphology Geomorphology, landform evolution Marine and continental quaternary Physical geography Sediment transport Surficial geology Threshold |
| title | Estimating critical stream power for bedload transport calculations in gravel-bed rivers |
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