  This work is devoted to the study of a viscous shallow-water system with
friction and capillarity term. We prove in this paper the existence of global
strong solutions for this system with some choice of large initial data when
$N\geq 2$ in critical spaces for the scaling of the equations. More precisely,
we introduce as in \cite{Hprepa} a new unknown,\textit{a effective velocity}
$v=u+\mu\n\ln h$ ($u$ is the classical velocity and $h$ the depth variation of
the fluid) with $\mu$ the viscosity coefficient which simplifies the system and
allow us to cancel out the coupling between the velocity $u$ and the depth
variation $h$. We obtain then the existence of global strong solution if
$m_{0}=h_{0}v_{0}$ is small in $B^{\N-1}_{2,1}$ and $(h_{0}-1)$ large in
$B^{\N}_{2,1}$. In particular it implies that the classical momentum
$m_{0}^{'}=h_{0} u_{0}$ can be large in $B^{\N-1}_{2,1}$, but small when we
project $m_{0}^{'}$ on the divergence field. These solutions are in some sense
\textit{purely compressible}. We would like to point out that the friction term
term has a fundamental role in our work inasmuch as coupling with the pressure
term it creates a damping effect on the effective velocity.
