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We report on an experimental study of a device composed by an array ofsubmerged, reversed and periodic cylindrical pendula (resonators), whoseobjective is the attenuation of surface gravity waves. The idea is inspired bythe concept of metamaterials, i.e. engineered structures designed to interactwith waves and manipulate their propagation properties. The study is performedin a wave flume where single frequency waves are excited in a wide range offrequencies. We explore various configurations of the device, measuring thetransmitted, reflected and dissipated energy of the waves. If the incoming wavefrequencies are sufficiently close to the natural frequency of the pendula, wefind a considerable wave attenuation effect, driven by viscous dissipativemechanisms. This behaviour is enhanced by the number of resonators in thearray. Moreover, the device is also capable of reflecting the energy ofselected frequencies of the incoming waves. These frequencies can be predictedby assuming the interactions involving at least three wave modes, includinghigher harmonics, and are therefore associated with the distance between theresonators. The presented results show promise for the development of aenvironmentally sustainable device for mitigating waves in coastal zones.

Attenuating surface gravity waves by an array of submerged resonators: an experimental study