ich formulation is used to
calculate the strength of the pack ice.  The (<A
 HREF="node40.html#hibl79">Hibler(1979)</A>) calculation
depends on mean ice thickness and open water fraction.  The calculation
of (<A
 HREF="node40.html#roth75b">Rothrock(1975)</A>) is based on energetics and should not be used if the
ice that participates in ridging is not well resolved.  

<P>
<TT>evp_damping</TT> is used to control the damping of elastic waves in
the ice dynamics.  It is typically set to <TT>.true</TT>. for hig