Wave Run-Up Observations on Revetments With Different Porosities

Abstract

Wave run-up plays an important role in the design of coastal protection structures. However, none of the existing formulae for wave run-up predictions explicitly considers the effect of revetment porosity. Recently, two revetments have been tested in the Large Wave Flume (GWK) of Forschungszentrum Küste (FZK), a new type of highly porous polyurethane bonded (PBA revetment) revetment and a smooth interlocked pattern placed concrete block revetment (IPPB revetment), which is considered as "weakly permeable" for the present study. Wave run-up is evaluated by video data analysis based on timestack image processing. The results derived from the timestacks are compared to run-up data measured with conventional wire gauges and the good agreement demonstrates the accuracy and reliability of the video data analysis. The effect of the porosity of the revetment is incorporated into the EuroTop wave run-up formula, showing that for the present case it may reduce the relative run-up heights R u,2% /H m0 by about 25 % to 50 % as compared to a smooth impermeable slope.

Climate change impacts on critical international transportation assets of Caribbean Small Island Developing States (SIDS): the case of Jamaica and Saint Lucia

“…Authors: We agree with the reviewer in all his statements about the importance of waves and many of the authors have substantial experience in monitoring and modelling nearshore wave processes (including wave run up), erosion and hazard in different environmental settings (Broekema et al, 2016;Schimmels et al, 2012;Vousdoukas, 2014;Vousdoukas et al, 2014;Vousdoukas et al, 2009a;Vousdoukas et al, 2009b;Velegrakis et al 2016). We also acknowledge that waves in flooded areas during an 4 extreme event can assault coastal transportation assets in a manner that these assets are not designed for (UNECE 2013).…”

Modeling of wave run-up by applying integrated models of group method of data handling

“…Schimmels et al 5 proposed the following relations: where H mo is the wave height, γ p is the porosity coefficient, is the Iribarren number.…”

“…In this study, the formulas derived by Van der Meer and Stam 8 , and Schimmels et al 5 are applied to determine the two percent wave run-up height.…”

“…In the past decades, numerous studies applied experimental tests 3 – 5 and numerical modeling for simulating and predicting the wave run-up in coastal regions. In recent years modeling complex and nonlinear problems in science and engineering using machine learning (ML) models have received widespread attention and, in general, the capability of these approaches has been confirmed.…”

Wave Run-Up on Mortar-Grouted Riprap Revetments

“…All influence factors in Equation 2become γ i = 1 for a smooth impermeable revetment without a berm and for perpendicular wave attack. The influence factor γ f' is called the "influence factor due to roughness", but is used in the EurOtop Manual [8] and by many researchers, e.g., [22,23], as a factor that summarizes the influence of roughness, porosity, and permeability. Because these influences are summarized in a single influence factor, this factor is determined for each revetment type as a constant or depending on wave parameters and structural parameters of the revetment type being investigated.…”