Irregular Wave Reflection and Run‐Up on Rough Impermeable Slopes

Abstract

Three irregular wave test runs were conducted to obtain detailed data on irregular wave reflection and run‐up on a 1:3 rough impermeable slope. The test results were also used to evaluate the capabilities and limitations of an extended numerical model for predicting the time series and spectral characteristics of the reflected waves and waterline oscillations on the slope. The numerical model is shown to predict the measured time series and spectra reasonably well, including the selective nature of wave reflection and dissipation as well as the appearance of low‐frequency wave components in the waterline oscillations on the 1:3 slope. The numerical model extended herein may not be as accurate as hydraulic model tests but can be used to predict hydrodynamic quantities that are difficult to measure directly. Moreover, any incident irregular wave train including that measured in the field or generated numerically for given incident wave spectrum can be specified as input to the numerical model. This will avoid the difficulties associated with the reproduction of specified incident irregular waves in experiments.