I have been involved in a European Union funded project on research and development of wave power devices. My contribution was concerned with the effects of hydrodynamic interactions on the performance of arrays of devices. Part of this work was carried out in collaboration with Spyros Mavrakos of the National Technical University of Athens, Greece. Return to contents . The McIver toroid Permeable breakwaters Noise barriers Wave power Return to contents .
Trapped modes are oscillations of an unbounded medium that have finite energy.
Mathematically, a trapped mode in this problem corresponds to eigenvalue embedded in the continuous spectrum of the relevant operator. The above images show the amplitude of the fluid motion due to plane wave incidence on a semi-infinite breakwater. On the other hand, the permeable breakwater allows tranmission into the shadow region and weakens reflections. This picture shows the sound field around a rigid noise barrier standing on a horizontal plane. The sound is incident from the left and regions of low sound intensity are identified by the dark tones.