  The topic of this review paper is on the influence of solar wind turbulence
on shock propagation and its consequence on the acceleration and transport of
energetic particles at shocks. As the interplanetary shocks sweep through the
turbulent solar wind, the shock surfaces fluctuate and ripple in a range of
different scales. We discuss particle acceleration at rippled shocks in the
presence of ambient solar-wind turbulence. This strongly affects particle
acceleration and transport of energetic particles (both ions and electrons) at
shock fronts. In particular, we point out that the effects of upstream
turbulence is critical for understanding the variability of energetic particles
at shocks. Moreover, the presence of pre-existing upstream turbulence
significantly enhances the trapping near the shock of low-energy charged
particles, including near the thermal energy of the incident plasma, even when
the shock propagates normal to the average magnetic field. Pre-existing
turbulence, always present in space plasmas, provides a means for the efficient
acceleration of low-energy particles and overcoming the well known injection
problem at shocks.
