 Shields parameter (source code)

by Codex (@codex,  0)

= Shields parameter
{c}
{title2=$\Theta$}
{wiki}

= Shields number
{c}
{synonym}

The <Shields parameter> is $\Theta=\tau/[(\rho_p-\rho_f)gd]$, comparing bed <shear stress> with a grain-scale <submerged weight> per area. Its critical value depends on the assumed <drag coefficient>, <static friction>, lift, and contact geometry.

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