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Shear Stress

Shear Stress. Basal Shear Stress— tractive force available t b = g w h S g w = specific weight of water (9,800 N/m 3 ) h = water depth (m) S = water slope (m/m, i.e. dimensionless). Critical Shear Stress—tractive force required t c = q ( g s - g w ) d

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Shear Stress

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  1. Shear Stress • Basal Shear Stress—tractive force available • tb = gw h S gw = specific weight of water (9,800 N/m3) h = water depth (m) S = water slope (m/m, i.e. dimensionless). • Critical Shear Stress—tractive force required • tc = q(gs - gw) d q = Shields’ parameter (dimensionless shear stress) gs = specific weight of sediment (26,000 N/m3) gw = specific weight of water (9,800 N/m3) d = particle diameter (m).

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