Wave overtopping performance of mild slope rock revetments enhanced with additional armour layer thickness

Mild slope rock revetments offer strong potential for improving coastal resilience, particularly under future climate conditions where higher overtopping risks are expected. However, overtopping performance data for mild slope rock revetments, especially with enhanced armour configurations, remain limited. This study investigated small-scale 2D physical model tests on mean overtopping discharges at rock revetments with mild slopes of cot α = 4 and cot α = 5, considering both conventional two-rock layer and enhanced three-rock layer thick armour configurations. The present data extends the existing EurOtop database, contributing to a broader range of slopes and armour layer thicknesses. The EurOtop empirical prediction for mean overtopping discharges on impermeable slopes under breaking wave conditions was improved with respect to the influence of roughness, which incorporates the effects of both surface roughness and permeability. Based on the present tests on mild slope rock revetments, including those with an additional armour layer, the influence of roughness was found to correspond to roughness factors ranging from 0.35 to 0.43. Despite minor variations, a roughness factor of 0.40 was proposed to support practical application. Additionally, the findings provide new insights into how an additional armour layer on the slope up to the crest under increased water levels affect the influence of roughness.

Text 124711.pdf - Published Version Restricted to Repository staff only Download (3MB) Official URL or Download Paper: https://linkinghub.elsevier.com/retrieve/pii/S0029...

Actions (login required)

View Item