  The aim of this work is to study trapped waves and their collisions between
two topographic obstacles for the forced Korteweg-de Vries equation. Numerical
simulations show that solitary waves remain trapped bouncing back and forth
between the obstacles until the momentum overcomes a certain threshold. We find
that the waves have a certain tendency of escaping out upstream. Furthermore,
the time of escape of the trapped wave varies linearly with the distance
between the bumps. Besides, we study collisions of solitary waves between the
obstacles. Although the dynamic of one wave is affected by the other one,
statistically this feature is not evident.
