Wave trapping and radiation by semi-immersed circular cylinders

For the first time laboratory measurements are presented of wave propagation in conditions in which Porter & Evans (2009) made the following predictions: (a) that waves incident on a floating semi-immersed cylinder would be totally reflected, and (b) that a pair of semi-immersed cylinders can exhibit a family of motion-trapped modes. The theory is extended to cover the situation in which the cylinders in the latter case are mechanically driven. 1