Scientific Investigations Report 2008–5093
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5093
Table 8. Grain shear stress, largest mobilized particle, and particle classification for a factor of 0.5, 1.0, and 1.5 times the dune height and (or) dune length for simulation 5 (river discharge, 28,900 cubic feet per second), Coeur d’Alene River near Dudley, Idaho.
[Abbreviations: da, largest mobilized particle size in millimeters; N/m2, Newtons per square meter; ft, feet; mm, millimeter. Symbols: λ, wave length of dune, in feet; ∆, wave height of dune in feet; τb, FASTMECH simulated bed shear stress, in Newtons per square meter (see equation 3); τ’o, grain shear stress, in Newtons per square meter (see equation 5)]
| Model simulated results Average τb = 5.7 N/m2 Maximum τb = 6.7 N/m2 |
Wave length (λ) multiplication factor | |||
| 0.5 (λ = 31.5 ft) |
1.0 (λ = 63 ft) |
1.5 (λ = 94.5 ft) | ||
| Wave height (∆) multiplication factor |
0.5 (∆ = 0.55 ft) |
τ’o = 3.7 N/m2 da = 5.3 mm Fine gravel |
τ’o = 4.5 N/m2 da = 6.4 mm Fine gravel |
τ’o = 4.9 N/m2 da = 6.9 mm Fine gravel |
| 1.0 (∆ = 1.1 ft) |
τ’o = 2.5 N/m2 da = 3.0 mm Very fine gravel |
τ’o = 3.5 N/m2 da = 5.1 mm Fine gravel |
τ’o = 4.0 N/m2 da = 5.7 mm Fine gravel | |
| 1.5 (∆ = 1.65 ft) |
τ’o = 1.8 N/m2 da = 2.8 mm Very fine gravel |
τ’o = 2.8 N/m2 da = 4.1 mm Fine gravel |
τ’o = 3.4 N/m2 da = 4.9 mm Fine gravel |
|
U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubs.usgs.gov/sir/2008/5093
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