Influence of waves on Lagrangian acceleration in two-dimensional turbulent flows Romain Nguyen van yen, Benjamin Kadoch, Vivek Kumar, Benjamin Ménétrier, Marie Farge, Kai Schneider, Diane Douady and Lionel Guez ESAIM: Proc., 32 (2011) 231-241 Published online: 03 November 2011 DOI: 10.1051/proc/2011023