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\[k_c = \frac{\kappa \sigma_c}{6} = \frac{\kappa}{6} \left\{
\begin{align}
& 0.4+3.5 \sin^2 \left( \frac{\pi}{2} \frac{W_s}{u_{*c}} \right)
\text{ if } \frac{W_s}{u_{*c}} \le 1 \\
& 1.0+2.9 \sin^2 \left( \frac{\pi}{2} \frac{u_{*c}}{W_s} \right)
\text{ if } \frac{W_s}{u_{*c}} \gt 1 \\
\end{align} \right.\qquad\qquad\text{(166)}\]
\[k_w = \frac{\kappa \sigma_w}{3 \pi} = \frac{\kappa}{3 \pi} \left\{
\begin{align}
& 0.15+1.5 \sin^2 \left( \frac{\pi}{2} \frac{W_s}{u_{*w}} \right)
\text{ if } \frac{W_s}{u_{*w}} \le 1 \\
& 1.0+0.65 \sin^2 \left( \frac{\pi}{2} \frac{u_{*w}}{W_s} \right)
\text{ if } \frac{W_s}{u_{*w}} \gt 1 \\
\end{align} \right.\qquad\qquad\text{(167)}\]