What is the primary operational difference between an attenuator and a terminator WEC?

The primary operational difference between an attenuator and a terminator Wave Energy Converter (WEC) lies in their orientation and how they interact with incoming waves. An attenuator WEC is typically a long, multi-segmented structure oriented parallel to the direction of wave propagation. It flexes and bends as waves pass along its length, extracting energy from the relative motion between its segments. For example, the Pelamis WEC was an attenuator, consisting of several cylindrical sections connected by hinged joints. Conversely, a terminator WEC is oriented perpendicular to the direction of wave propagation. It aims to intercept and absorb the energy of the incoming waves across its entire width. Overtopping devices, which capture water as waves break over them and then channel this water back to sea level through turbines, are an example of terminator WECs. Therefore, attenuators ride the waves, flexing with their motion, while terminators block and absorb the waves directly.