  We study computationally the dynamics of forced, Brownian particles through a
disordered system. As the concentration of mobile particles and/or fixed
obstacles increase, we characterize the different regimes of flow and address
how clogging develops. We show that clogging is preceded by a wide region of
anomalous transport, characterized by a power law decay of intermittent bursts.
We analyze the velocity distribution of the moving particles and show that this
abnormal flow region is characterized by a coexistence between mobile and
arrested particles, and their relative populations change smoothly as clogging
is approached. The comparison of the regimes of anomalous transport and
clogging with the corresponding scenarios of particles pushed through a single
bottleneck show qualitatively the same trends highlighting the generality of
the transport regimes leading to clogging.
