Residual waves and their possible damping time in the OEB

After the termination of wave making, the characteristics and decays\u2019 of the existing wave components in a 3D large scale Offshore Engineering wave Basin (OEB) at Ocean, Coastal and River Engineering (OCRE) portfolio of the National Research Council of Canada have been investigated experimentally. Measured experimental time series data are analysed to identify the time required to reach the surface undulation to a pre-set threshold of 0.5mm. This threshold is assumed to be the allowable undulation of the free surface in the OEB to generate next wave. In the present work regular and irregular waves are used. From a set of experimental wave data obtained from OEB, the settling time of the water surface can be calculated using a threshold. In the present analysis comparisons of the surface elevations are done for regular and irregular waves for two different waiting times such as 20 minutes and calculated waiting time [when waves are generated with free surface undulation is between 0 and 0.5mm].Peer reviewed: NoNRC publication: Ye