scholarly journals UPDATE OF THE EUROTOP MANUAL: NEW INSIGHTS ON WAVE OVERTOPPING

2017 ◽  
pp. 40 ◽  
Author(s):  
Jentsje W. Van der Meer ◽  
William Allsop ◽  
Tom Bruce ◽  
Julien De Rouck ◽  
Tim Pullen ◽  
...  
Keyword(s):  
Neural Network ◽  
Wave Overtopping ◽  
Major Improvement ◽  
Vertical Walls ◽  
Run Up ◽  
Steep Slopes

Quite some new insights on wave overtopping were achieved since the first submission of the EurOtop Manual in 2007, which have now resulted in a second edition of this Manual. A major improvement has been made on the understanding of wave by wave overtopping and tolerable wave overtopping that is connected to it. Many videos are available on the overtopping website that show all kind of overtopping discharges and volumes and may give guidance for the user of the Manual. The EurOtop Neural Network and the EurOtop database are improved and extended versions of the earlier NN and CLASH database. New insights and prediction formulae have been developed for very low freeboards; for very steep slopes up to vertical walls; for run-up on steep slopes; for overtopping on storm walls on a promenade; and for overtopping on vertical walls, where overtopping has been divided in situations with and without an influencing foreshore and where the first situation may be divided in non-impulsive and impulsive overtopping.

scholarly journals EXPERIMENTAL STUDY ON THE OVERTOPPING BEHAVIOUR OF STEEP SLOPES – TRANSITION BETWEEN MILD SLOPES AND VERTICAL WALLS

2012 ◽  
Vol 1 (33) ◽  
pp. 61
Author(s):  
Lander Victor ◽  
Peter Troch
Keyword(s):  
Slope Angle ◽  
Breaking Waves ◽  
The Other ◽  
Prediction Methods ◽  
Wave Overtopping ◽  
Wave Energy Converters ◽  
Vertical Walls ◽  
The One ◽  
Steep Slopes ◽  
Existing Data

Extensive knowledge is available on the overtopping behaviour of traditional smooth impermeable sea defence structures, such as mildly sloping dikes and vertical walls, both typically featuring a high crest freeboard to reduce wave overtopping. A particular design application emerges in the development of wave energy converters of the overtopping type, where maximisation of wave overtopping is required, i.e. smooth impermeable steep sloping structures with low crest freeboards subjected to non-breaking waves. To date, only relatively limited knowledge is available on the overtopping behaviour of those structures. In this study, the average overtopping rate obtained from new experiments has been analysed and compared with existing prediction methods. This study contributes to a better knowledge on the overtopping behaviour of the steep low-crested structures, which is positioned in between that of mildly sloping dikes and vertical walls on the one hand, and in between that of structures with zero crest freeboards and relatively large crest freeboards on the other hand. The existing prediction methods seem unable to predict the significant effects of the slope angle and small relative crest freeboards on the average overtopping rate accurately. Therefore, a new set of prediction formulae is proposed based on the new experiments combined with existing data from literature. These formulae include wave overtopping at vertical walls subjected to non-impacting waves and at structures with zero crest freeboard.

scholarly journals Wave Overtopping Database As the Starting Point for a Neural Network Prediction Method

2004 ◽  
Author(s):  
H. Verhaeghe ◽  
J. W. van der Meer ◽  
G.-J. Steendam ◽  
P. Besley ◽  
L. Franco ◽  
...  
Keyword(s):  
Neural Network ◽  
Prediction Method ◽  
Wave Overtopping ◽  
Starting Point ◽  
Neural Network Prediction ◽  
Network Prediction

scholarly journals PHYSICAL MODEL TESTS ON WAVE OVERTOPPING AND FLOW PROCESSES ON DIKE CRESTS INFLUENCED BY WAVE-CURRENT INTERACTION

2012 ◽  
Vol 1 (33) ◽  
pp. 34 ◽  
Author(s):  
Stefanie Lorke ◽  
Babette Scheres ◽  
Holger Schüttrumpf ◽  
Antje Bornschein ◽  
Reinhard Pohl
Keyword(s):  
Physical Model ◽  
Model Tests ◽  
Longshore Current ◽  
Wind Fields ◽  
Incoming Wave ◽  
Wave Overtopping ◽  
Improve Design ◽  
Physical Model Tests ◽  
Flow Processes ◽  
Run Up

Flow processes like flow depths and flow velocities give important information about erosion and infiltration processes, which can lead to an unstable dike structure and consequently to dike failure. Up to now several physical model tests on wave run-up and wave overtopping are available to adjust and improve design formula for different dike structures. This kind of physical model tests have been performed in the here presented project FlowDike. Its main purpose is to consider two new aspects that could influence the assessment of wave run-up and wave overtopping as well as the flow processes on dikes which have not been investigated yet: longshore current and wind. Especially in estuaries and along coasts, the effect of tidal and storm induced currents combined with local wind fields can influence the incoming wave parameters at the dike toe as well as the wave run-up height, the wave overtopping rate and the flow processes on dikes. This paper will focus on these flow processes on dike slopes and dike crests on an 1:6 sloped dike influenced by oblique wave attack and longshore current.

scholarly journals THE WAVE RUN-UP SIMULATOR, THEORY AND FIRST PILOT TEST

2012 ◽  
Vol 1 (33) ◽  
pp. 65 ◽  
Author(s):  
Jentsje Van der Meer ◽  
Yvo Provoost ◽  
Gosse Jan Steendam
Keyword(s):  
Prediction Method ◽  
Pilot Test ◽  
Wave Overtopping ◽  
Run Up

The idea of the Wave Run-up Simulator is based on the experiences with the Wave Overtopping Simulator. It is possible to simulate wave tongues overtopping a dike crest in reality. It must also be possible to simulate waves in the run-up and run-down zone of the seaward slope. This is the zone after waves have broken and when they rush-up the slope. The present paper describes this new idea of the Wave Run-up Simulator, why it is useful to develop the machine, to perform research with it and to develop a prediction method for slope strength. In fact, a prediction method can already be developed from the Cumulative Overload Method, which was developed on the basis of results with the Wave Overtopping Simulator, see Van der Meer et al. (2010). It also means that tests on the seaward slope will be done for validation purposes only. The paper describes in detail what is known about the movement of waves in this run-up zone and what actually the Wave Run-up Simulator has to simulate. Not a lot of research has been performed to describe the wave run-up process in detail, physically nor statistically. Finally, the pilot test has been described including hydraulic measurements on the slope.

Influence of Parapets and Recurves on Wave Overtopping and Wave Loading of Complex Vertical Walls

2004 ◽  
Author(s):  
A. Kortenhaus ◽  
J. Pearson ◽  
T. Bruce ◽  
N. W. H. Allsop ◽  
J. W. van der Meer
Keyword(s):  
Wave Loading ◽  
Wave Overtopping ◽  
Vertical Walls
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