Wave Overtopping on Vertical and Composite Breakwaters

Franco, Leopoldo; Gerloni, M. de; Meer, Jentsje W. van der

doi:10.1061/9780784400890.076

Cited by 63 publications

(84 citation statements)

References 1 publication

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“…These methods are based on the classical overtopping approach of defining dike safety based on an allowable overtopping discharge q max [m 3 /s/m]. Other studies concluded that overtopping erosion is better estimated from individual wave overtopping volumes V [m 3 /m] [10][11][12][13]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Failure of Grass Covered Flood Defences with Roads on Top Due to Wave Overtopping: A Probabilistic Assessment Method

Lopez

Warmink²,

Bomers³

et al. 2018

JMSE

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Abstract:Hard structures, i.e., roads, are commonly found over flood defences, such as dikes, in order to ensure access and connectivity between flood protected areas. Several climate change future scenario studies have concluded that flood defences will be required to withstand more severe storms than the ones used for their original design. Therefore, this paper presents a probabilistic methodology to assess the effect of a road on top of a dike: it gives the failure probability of the grass cover due to wave overtopping over a wide range of design storms. The methodology was developed by building two different dike configurations in computational fluid dynamics Navier-Stokes solution software; one with a road on top and one without a road. Both models were validated with experimental data collected from field-scale experiments. Later, both models were used to produce data sets for training simpler and faster emulators. These emulators were coupled to a simplified erosion model which allowed testing storm scenarios which resulted in local scouring conditioned statistical failure probabilities. From these results it was estimated that the dike with a road has higher probabilities (5 × 10 −5 > P f >1 × 10 −4 ) of failure than a dike without a road (P f < 1 × 10 −6 ) if realistic grass quality spatial distributions were assumed. The coupled emulator-erosion model was able to yield realistic probabilities, given all the uncertainties in the modelling process and it seems to be a promising tool for quantifying grass cover erosion failure.

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Section: Introductionmentioning

confidence: 99%

Failure of Grass Covered Flood Defences with Roads on Top Due to Wave Overtopping: A Probabilistic Assessment Method

Lopez

Warmink²,

Bomers³

et al. 2018

JMSE

View full text Add to dashboard Cite

show abstract

“…As an example, the formula for calculating the mean overtopping rate at the various reservoirs [11] has the same structure as that commonly used for the rubble mound breakwaters [12] and the procedure for evaluating the efficiency of the device includes an algorithm to estimate the "wave by wave" overtopping discharge, which has been originally suggested for vertical breakwaters [13].…”

Section: Japanese Design Practice For Monolithic Maritime Dikesmentioning

confidence: 99%

Non Breaking Wave Forces at the Front Face of Seawave Slotcone Generators

et al. 2012

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Abstract:The Seawave Slotcone Generator (WAVEnergy SAS, 2003) is a wave energy converter based on the overtopping principle. Although it has been effectively researched during the last decade, no design tool has been supplied to estimate the hydrodynamic loads the waves exert on its front face. In this article a set of well reliable 3D experiments has been re-analyzed, in order to get indications on possible calculation methods. It is shown that the Japanese design tools for monolithic sea dikes may be reasonably adapted to the present case. Finally a new approach is presented, which is based on the so called momentum flux principle; the resulting predictive equation fits the experimental data remarkably well.

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“…As far as the volume influx Q in,j is concerned, it is supposed to be constant over a "wave cycle" of duration T m and to vary wave by wave. Thus, a random series of overtopping discharges is simulated, using the approach described in [34], which is based on a three parameters Weibull distribution. One of these parameters is the mean overtopping discharge, q ov,j , whose estimation is discussed in Section 2.…”

Section: A-i3 the Mean Available Power In A Sea-statementioning

confidence: 99%

The SSG Wave Energy Converter: Performance, Status and Recent Developments

et al. 2012

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Abstract:The Sea-wave Slot-cone Generator (SSG) is a Wave Energy Converter based on the wave overtopping principle; it employs several reservoirs placed on top of each other, in which the energy of incoming waves is stored as potential energy. Then, the captured water runs through turbines for electricity production. The system works under a wide spectrum of different wave conditions, giving a high overall efficiency. It can be suitable for shoreline and breakwater applications and presents particular advantages, such as sharing structure costs, availability of grid connection and recirculation of water inside the harbor, as the outlet of the turbines is on the rear part of the system. Recently, plans for the SSG pilot installations are in progress at the Svaaheia site (Norway), the port of Hanstholm (Denmark) and the port of Garibaldi (Oregon, USA). In the last-mentioned two projects, the Sea-wave Slot-cone Generator technology is integrated into the outer harbor breakwater and jetty reconstruction projects. In the last years extensive studies have been performed on the hydraulic and the structural response of this converter, with the aim of optimizing the design process. The investigations have been conducted by physical model tests and numerical simulations and many results have been published on both conference proceedings and journals. The main scope of this paper is reviewing the most significant findings, to provide the reader with an organic overview on the present status of knowledge. T m = time domain mean wave period (s). T p = peak wave period (s). WAB = Wave Activated Bodies. WEC = Wave Energy Converter. Greek Letters:α r = front ramp angle on the horizontal (deg.). α eq. = equivalent front angle for reflection analysis. α incl = mean front slope in the run-up area. Δ = duration of a sea-state (s or hr.).

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Wave Overtopping on Vertical and Composite Breakwaters

Cited by 63 publications

References 1 publication

Failure of Grass Covered Flood Defences with Roads on Top Due to Wave Overtopping: A Probabilistic Assessment Method

Failure of Grass Covered Flood Defences with Roads on Top Due to Wave Overtopping: A Probabilistic Assessment Method

Non Breaking Wave Forces at the Front Face of Seawave Slotcone Generators

The SSG Wave Energy Converter: Performance, Status and Recent Developments

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