Wave run-up and overtopping over smooth and rock slopes of coastal structures without crown walls

Abstract

This paper is concerned with a comparatively largescale laboratory investigation carried out to examine the
overtopping performance of a straight, rock slope without a crown
wall. Measurements made over a smooth slope to verify the
reliability of the experimental set-up are also reported. The wave
run-up and overtopping data from the present tests with regular
waves, when appropriately scaled based on the assumption of
Rayleigh distribution for wave heights, show good agreement
with corresponding data from irregular waves. The average
overtopping discharges over the smooth and rock slopes have also
been compared with different models available in the literature.
Moreover, the overtopping rates for the comparatively large-scale
rock slope tested in the present study show good agreement with
the previous measurements reported in Van der Meer when scaled
with a roughness reduction factor of 0.55. The overtopping
measurements for the rock slope without a crown wall have also
been compared with the overtopping model employed by
Bradbury and Allsop for their measurements over rock slopes
with crown walls.