National Research Council of Canada. Ocean, Coastal and River Engineering
Text, Technical Report
wave damping in OEB; natural frequency; shallow water
During the generation of any wave in the tank we get relevant primary wave component along with bounded wave components if the incident primary wave has more than one frequency. Inevitably we also get interacted wave components, natural frequency components of the tank and other free waves. In this report the natural frequency energy components in the OEB were investigated using several cases of mono- and bi-chromatic waves in the tank. These natural frequency components were compared with the total energy and bounded wave energy measured in the tank. The reason of this investigation is to understand the extent of the natural frequency energy components of the tank of different modes in the measured wave data and also the damping rate of the residual surface undulation components in the tank with time. Results are shown for both mono and bi-chromatic waves. It is found that the primary frequency components are interacting with each other in different forms and wave energies are transferred to the interacted frequency bands. Also from the data, we observed that the natural frequency components for both longitudinal and transverse directions of the tank were too small compare to the primary wave components at least in the cases that we considered here.