Experimental Analysis of Wave Overtopping: A New Small Scale Laboratory Dataset for the Assessment of Uncertainty for Smooth Sloped and Vertical Coastal Structures

Most physical model tests carried out to quantify wave overtopping are conducted using a wave energy spectrum, which is then used to generate a free surface wave time series at the wave paddle. This method means that an infinite number of time series can be generated, but, due to the expense of running physical models, often only a single time series is considered. The aim of this work is to investigate the variation in the main overtopping measures when multiple wave times series generated from the same spectrum are used. Physical model tests in a flume measuring 15 m (length) by 0.23 m (width) with an operating depth up to 0.22 m were carried out using a stochastic approach on two types of structures (a smooth slope and a vertical wall), and a variety of wave conditions. Results show variation of overtopping discharge, computed by normalising the range of the discharges at a certain wave condition with the maximum value of the discharge in the range up to 10 % , when the same wave time series is used, but this range increases to 75 % when different time series are used. This variation is found to be of a similar magnitude to both the one found with similar experiments looking at the phenomena in numerical models, and that specified by the confidence bounds in empirical methods.

[1]  Hannah Elizabeth Williams.  Uncertainty in the prediction of overtopping parameters in numerical and physical models due to offshore spectral boundary conditions , 2015 .

[2]  Marco Petti,et al.  Numerical simulation of wave overtopping at coastal dikes and low-crested structures by means of a shock-capturing Boussinesq model , 2013 .

[3]  Hannah E. Williams,et al.  The Uncertainty in the Prediction of the Distribution of Individual Wave Overtopping Volumes Using a Nonlinear Shallow Water Equation Solver , 2016, Journal of Coastal Research.

[4]  Steven A Hughes,et al.  PHYSICAL MODELS AND LABORATORY TECHNIQUES IN COASTAL ENGINEERING , 1993 .

[5]  Julien De Rouck,et al.  Field measurements of wave overtopping at the rubble mound breakwater of Rome-Ostia yacht harbour , 2005 .

[6]  Nicholas Dodd,et al.  Numerical Model of Wave Run-Up, Overtopping, and Regeneration , 1998 .

[7]  A. Kortenhaus,et al.  Impacts on a storm wall caused by non-breaking waves overtopping a smooth dike slope , 2017 .

[8]  A. Pedrozo‐Acuña,et al.  On the role of uncertainty for the study of wave–structure interaction , 2015 .

[9]  Peter A. Troch,et al.  Probability distribution of individual wave overtopping volumes for smooth impermeable steep slopes with low crest freeboards , 2012 .

[10]  Leopoldo Franco,et al.  Overtopping performance of different armour units for rubble mound breakwaters , 2009 .

[11]  Hadewych Verhaeghe,et al.  The new wave overtopping database for coastal structures , 2009 .

[12]  Terry Hedges,et al.  Investigating the Lengths of Scale Model Tests to Determine Mean Wave Overtopping Discharges , 2008 .

[13]  Leopoldo Franco,et al.  Uncertainties in the physical modelling of the wave overtopping over a rubble mound breakwater: The role of the seeding number and of the test duration , 2015 .

[14]  Josep R. Medina,et al.  Neural network modelling of wave overtopping at coastal structures , 2007 .

[15]  Peter Stansby,et al.  Coupled wave action and shallow-water modelling for random wave runup on a slope , 2011 .

[16]  J. A. Battjes,et al.  Wave height distributions on shallow foreshores , 2000 .

[17]  William Allsop,et al.  Prediction of Wave Overtopping at Steep Seawalls—Variabilities and Uncertainties , 2002 .

[18]  Dominic E. Reeve,et al.  Numerical study of combined overflow and wave overtopping over a smooth impermeable seawall , 2008 .

[19]  Tim Pullen,et al.  Field and laboratory measurements of mean overtopping discharges and spatial distributions at vertical seawalls , 2009 .

[20]  Tim Pullen,et al.  The role of offshore boundary conditions in the uncertainty of numerical prediction of wave overtopping using non-linear shallow water equations. , 2014 .

[21]  Peter A. Troch,et al.  Numerical investigations of wave overtopping at coastal structures , 2009 .

[22]  M. Zijlema,et al.  Efficient and robust wave overtopping estimation for impermeable coastal structures in shallow foreshores using SWASH , 2017 .

[23]  Julien De Rouck,et al.  Full-scale wave overtopping measurements on the Zeebrugge rubble mound breakwater , 2004 .

[24]  Matthew E. Hubbard,et al.  A 2D numerical model of wave run-up and overtopping , 2002 .

[25]  Julien De Rouck,et al.  Prototype measurements and small-scale model tests of wave overtopping at shallow rubble-mound breakwaters: the Ostia-Rome yacht harbour case , 2009 .

[26]  Hans F. Burcharth,et al.  Distribution of individual wave overtopping volumes in shallow water wave conditions , 2014 .

[27]  Hassan Akbari,et al.  Simulation of wave overtopping using an improved SPH method , 2017 .

[28]  P. Girolamo,et al.  Large impulsive forces on recurved parapets under non-breaking waves. A numerical study , 2018, Coastal Engineering.

[29]  Peter Stansby,et al.  Random wave runup and overtopping a steep sea wall: Shallow-water and Boussinesq modelling with generalised breaking and wall impact algorithms validated against laboratory and field measurements , 2013 .

[30]  C. Favaretto,et al.  Experimental investigation on non-breaking wave forces and overtopping at the recurved parapets of vertical breakwaters , 2018, Coastal Engineering.