Generation of Highly Nonlinear Waves in a Short Wave Flume

The typical approach for generating nonlinear waves in physical models involves employing first-or second-order wave theory, requiring a large water depth at the wavemaker. When the prototype bathymetry showsa gentleslope, a largefacility is required. However, practical constraints often make this unfeasible, leading to the useof steep transition slopes to obtainsufficient water depth at the generator.Incorporating a transition slope may generateunwanted free waves beyond the transition point, significantly impacting the wave parameters. The presence of these freewaves causes the response of the tested structure to deviate from thatfoundin the prototype.This paper offers guidelines for usingtransition slopes effectively while avoiding the generation of undesired free waves after the transition point