Parameter $\phi$ for trough

Symbol
$\phi_{b}$
Formulae
$\frac{2.13 \left(\frac{w_{t}}{h_{t}}\right)^{0.065}}{\left(0.05 + \frac{t_{t}}{h_{t}}\right)^{0.39}}$
Related
$h_{t}$
$w_{t}$
Used in
$T_{tr}$