Observation of broad-band water wave guiding in shallow water

We report on the observation and characterization of broad-band wave guiding of surface gravity waves in an open channel in the shallow water limit. The wave guide is constructed by changing locally the depth of the fluid layer, which creates conditions for surfaces waves to propagate along the guide. We present experimental and numerical results of this shallow water wave guiding, which can be straightforwardly matched to the one-dimensional wave equation of shallow water waves. Furthermore, we also probe the possibility of wave guiding in curve guides and measure how this changes wave propagation.