  Ostrovsky's equation with time- and space- dependent forcing is studied. This
equation is model for long waves in a rotating fluid with a non-constant depth
(topography). A classification of Lie point symmetries and low-order
conservation laws is presented. Generalized travelling wave solutions are
obtained through symmetry reduction. These solutions exhibit a wave profile
that is stationary in a moving reference frame whose speed can be constant,
accelerating, or decelerating.
