Prediction of Dynamic and Quasi-Static Impacts on Vertical Sea Walls Caused by an Overtopped Bore

Streicher, Maximilian; Kortenhaus, Andreas; Gruwez, Vincent; Hofland, Bas; Chen, Xuexue; Hughes, Steven A.; Hirt, Matthias

doi:10.9753/icce.v36.papers.28

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…These conditions highlight the design uncertainties in an OWC installed breakwater design when exposed to actual wave loads, especially impact loads. There has been a century of quantified observation on wave loadings occur on a breakwater (Viviano et al, 2019;Lugni et al, 2010a;Lugni et al, 2010b;Lugni et al, 2006;Oumeraci et al, 2001) including the one caused by overtopped bore, such as during the event like tsunami (Streicher et al, 2017, Streicher et al, 2018and Streicher et al, 2019. The earlier attempt to model the wave loads ignored the distinction between a non-impulsive and impulsive wave loads (Hiroi, 1919).…”

Section: Introductionmentioning

confidence: 99%

Front Wall and In-Chamber Impact Loads on a Breakwater-Integrated Oscillating Water Column

Pawitan

Vicinanza

Allsop³

et al. 2020

J. Waterway, Port, Coastal, Ocean Eng.

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Large-scale tests (about 1:9 of full scale) were carried out at the Large Wave Channel (GWK) on Oscillating Water Column (OWC) wave energy converters to analyse loading and water column behaviour over a wide range of wave steepnesses. The paper shows that prediction methods for non-impulsive wave loads and impulsive wave loads developed for conventional e ca b ea a e ca be ada ed OWC a ad e ac (). T e a e ad analysis demonstrates that the impact probability method from project Probabilistic Design Tools for Vertical Breakwater (PROVERBS) estimates well the proportion of impacts experienced. Observations within the OWC chamber provide new insight on water column behaviour, c d ee d e e c a ca ac d e a : e ac , cce a ac , a d a e c ac. T e e de a e c d at risk of violent impact inside the chamber.

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Section: Introductionmentioning

confidence: 99%

Front Wall and In-Chamber Impact Loads on a Breakwater-Integrated Oscillating Water Column

Pawitan

Vicinanza

Allsop³

et al. 2020

J. Waterway, Port, Coastal, Ocean Eng.

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“…The processes involved in an overtopped wave bore impacting the vertical wall are described by Streicher et al (2019). Here, two simultaneous wave impact force measurements are shown in Fig.…”

Section: Wave Impact Forcesmentioning

confidence: 99%

2d Overtopping and Impact Experiments in Shallow Foreshore Conditions

Gruwez

Vandebeek

Kisacik

et al. 2018

Int. Conf. Coastal. Eng.

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This paper introduces the 2D experiments conducted for the CREST project in the wave flume of Ghent University. The experiments focus on wave interactions with low-crested sea dikes fronted by a shallow foreshore and mildly to steeply sloping beaches, which is a very typical situation along the Belgian coast. Foreshore slopes of 1/20, 1/35, 1/50 and 1/80 were tested for a range of low to high energy wave conditions, a variation in wave steepness and two water levels. The main goal was to obtain a dataset in which the effects of the infragravity waves on the wave-structure interactions (i.e. wave overtopping and impact forces) can be studied. The tests included high spatial resolution surface elevation measurement tests, which is new for beaches including a dike in the inner surf zone. From the first results it became clear that the foreshore slope influences the wave transformation up to the dike toe. The influence is apparent comparing to existing (semi-) empirical models for prediction of the spectral wave period at the dike toe and wave overtopping at the dike crest. The high spatial resolution data show a steep increase in infragravity significant wave height in the very shallow area in front of the dike.

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Classification of bore patterns induced by storm waves overtopping a dike crest and their impact types on dike mounted vertical walls – a large-scale model study

Streicher

Kortenhaus

Marinov

et al. 2019

Coastal Engineering Journal

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States 14 Classification of bore patterns induced by storm waves 15 overtopping a dike crest and their impact types on dike mounted 16 vertical walls -A large-scale model study 17 Short duration bores in the coastal zone are generated by wave breaking in shallow 18water and mild foreshore conditions. In storm weather situations and for sea level 19 rise scenarios these bores approach the dike and interact with previously overtopped 20 or reflected bores. This results in a complex and turbulent interaction process of the 21 water masses before impact on any structure on top of the dike. Combined laser 22 scanner and video measurements were used to study the bore interaction processes. 23Five bore interaction patterns were distinguished as 1) regular bore pattern; 2) 24 collision bore pattern; 3) plunging breaking bore pattern; 4) sequential overtopping 25 bore pattern and 5) catch-up bore pattern. Video images of the bore running up the 26 wall and motion tracking of the leading edge were used to obtain a time series of 27 the run-up water at the wall. The impact loads of the bore hitting the wall on the 28 promenade were studied based on the signal of a vertical array of 13 pressure 29 sensors installed over the wall height. Three impact types were distinguished and 30 classified as 1) impulsive impact type; 2) dynamic impact type and 3) quasi-static 31 impact type. The majority of ~2/3 of the total number of impacts were comprised of 32 the quasi-static impact type. Links between the bore patterns and impact types were 33 discussed and its implication on force prediction under consideration of possible 34 scale effects highlighted. 35 Keywords: bore impact; pressure and force; overtopping bore; sea dike; vertical 36 crest wall; large-scale physical model; WALOWA project 37 42 the demand for a sufficient coastal defense system to protect these areas from flooding 43 and wave impact is apparent. The coasts along Belgium, The Netherlands or Germany 44 are often comprised of shallow waters and a mildly sloping sand foreshore (see Figure 45 1). At the end of the foreshore a second coastal defense structure may be built, most 46 48 defense structure. Overtopped wave impacts are then the result of the interaction 49 between the overtopped wave with any obstacle situated on the promenade. It was 50 previously described that the overtopped wave shows a bore type behavior (Chen et al. 51 2014). Recently, Lubin & Chanson (2017) proposed to use the analogy of a tidal 52 breaking bore to describe best the similarities to a bore resulting from broken waves. 53They observed that both bores are highly aerated and tidal bores showed a sequence of 54 splash-ups which are also found in splashing hydrodynamics of breaking waves as well 55 as similarities between bubble plume behavior in tidal bores and breaking waves in the 56 surf zone. Compared to tidal bores, the overtopped bores resulting from an irregular 57 wave field are of very short duration (T=0.5-3s) and prone to interactions with 58 previously overtopped bores,...

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Prediction of Dynamic and Quasi-Static Impacts on Vertical Sea Walls Caused by an Overtopped Bore

Cited by 4 publications

References 24 publications

Front Wall and In-Chamber Impact Loads on a Breakwater-Integrated Oscillating Water Column

Front Wall and In-Chamber Impact Loads on a Breakwater-Integrated Oscillating Water Column

2d Overtopping and Impact Experiments in Shallow Foreshore Conditions

Classification of bore patterns induced by storm waves overtopping a dike crest and their impact types on dike mounted vertical walls – a large-scale model study

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