SHAPE OF THE TAIL OF A 2-DIMENSIONAL SANDPILE

We study the shape of the tail of a heap of granular material. A simpl e theoretical argument shows that the tail adds a logarithmic correcti on to the slope given by the angle of repose. This expression is in go od agreement with experiments. We present a cellular automaton that co ntains gravity, dissipation, and surface roughness and its simulation also gives the predicted shape.