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\begin{equation} \tag{154} | \begin{equation} \tag{154} | ||
\sigma_w = \left { | \sigma_w = \left{ | ||
\begin{align} | \begin{align} | ||
& 0.15 + 1.5 \sin^2 \left( \frac{\pi}{2}\frac{W_s}{u_{*w}} \right) | & 0.15 + 1.5 \sin^2 \left( \frac{\pi}{2}\frac{W_s}{u_{*w}} \right) | ||
Revision as of 16:06, 4 October 2011
\begin{equation} \tag{154}
\sigma_w = \left{
\begin{align}
& 0.15 + 1.5 \sin^2 \left( \frac{\pi}{2}\frac{W_s}{u_{*w}} \right)
\text{ if }\frac{W_s}{u_{*w}}\le 1 \\
& 1.0 + 0.65 \sin^2 \left( \frac{\pi}{2}\frac{u_{*w}}{W_s} \right)
\text{ if }\frac{W_s}{u_{*w}}>1 \\
\end{align} \right.
\end{equation}