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\begin{equation} \tag{87}
\text{Ribberink (1998)}\Phi (t)=\frac{{{\theta }_{w}}(t)}{\left| {{\theta }_{w}}(t) \right|}
\end{equation}
\begin{equation} \tag{87}
\text{Ribberink (1998)}\Phi (t)=\frac{{{\theta }_{w}}(t)}{\left| {{\theta }_{w}}(t) \right|}
\end{equation}
