Layer thicknesses and velocities of wave overtopping flow at seadikes

Schüttrumpf, Holger; Oumeraci, Hocine

doi:10.1016/j.coastaleng.2005.02.002

Cited by 103 publications

(151 citation statements)

References 2 publications

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“…Equations for flow depth and velocity have been based on physical model investigations like by Schüttrumpf (2001Schüttrumpf ( , 2005 and Van Gent (2002), published as a joined paper in Schüttrumpf and Van Gent (2003). The problem at that time was that the flow depth predicted by Schüttrumpf was twice the one by Van Gent.…”

Section: Existing Equations Of Flow Depth and Flow Velocitymentioning

confidence: 99%

Flow Depths and Velocities at Crest and Landward Slope of a Dike, in Theory and With the Wave Overtopping Simulator

Meer

Hardeman²,

Steendam

et al. 2011

Int. Conf. Coastal. Eng.

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,Wave overtopping discharges at coastal structures are well described in the EurOtop Manual (2007), including the distribution of overtopping wave volumes. Each volume that overtops a dike or levee will have a certain flow velocity and depth record in time, often given by the maximum velocity and flow depth. This paper describes some further development of the theory on flow depth and velocities on the crest, but will also show an inconsistency with respect to the mass balance. The second part of the paper gives an analysis of measured values on real dikes, simulated by the Wave Overtopping Simulator. It gives also the method of "cumulative hydraulic load" to compare overtopping discharges for different wave conditions. A large wave height with less overtopping waves, but larger overtopping wave volumes, is more damaging than a small wave height with more, but smaller overtopping volumes, even if the overtopping discharge is similar. The reasons to develop the cumulative hydraulic load have been compared with the recently in the US developed method of erosional equivalence.

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Section: Existing Equations Of Flow Depth and Flow Velocitymentioning

confidence: 99%

Flow Depths and Velocities at Crest and Landward Slope of a Dike, in Theory and With the Wave Overtopping Simulator

Meer

Hardeman²,

Steendam

et al. 2011

Int. Conf. Coastal. Eng.

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“…Nevertheless, it relies on empirical formulas for estimating the water depths and flow velocities on top of the crest and along the landside slope. These empirical formulas [22] simplified the estimation of water depth and flow velocity for the design of sea dikes by proving a set of equations. More holistic approaches [23,24] are available for including the effects of bottom irregularities in the flow.…”

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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“…The formulae for calculating overtopping discharge can be found in Schüttrumpf and Oumeraci (2005) and Peng and Zou (2011). We found that both the layer thickness and velocity at the crest display large variations with time even for constant wave height and water depth, consequently leading to large variations of wave run-up and overtopping.…”

Section: Surf Zone Modellingmentioning

confidence: 98%

“…Wave overtopping discharge is equal to the volume flux at the crest of structure; therefore, Schüttrumpf and Oumeraci (2005) proposed that the overtopping discharge can be calculated from the product of the layer thickness and velocity at the crest. The formulae for calculating overtopping discharge can be found in Schüttrumpf and Oumeraci (2005) and Peng and Zou (2011).…”

Section: Surf Zone Modellingmentioning

confidence: 99%

Ensemble prediction of coastal flood risk arising from overtopping by linking meteorological, ocean, coastal and surf zone models

Zou

Chen

Cluckie

et al. 2013

Quart J Royal Meteoro Soc

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This paper presents an integrated 'Clouds-to-Coast' ensemble modelling framework of coastal flood risk due to wave overtopping. The modelling framework consists of four key components: meteorological forecasts, wave-tide-surge predictions, nearshore wave models and surf zone models. This type of ensemble prediction approach allows us to estimate the probabilities of various outcomes and so improve our understanding of the reliability of results. It also provides a measure of the uncertainty associated with predictions, which can be particularly large for extreme storms, and allows us to assess how the uncertainty propagates from meteorological forecasts to overtopping and subsequent coastal flood risk predictions. Copyright c 2013 Royal Meteorological SocietyKey Words: coastal flooding; overtopping; extreme events; ensemble prediction; uncertainty; sea wall

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Layer thicknesses and velocities of wave overtopping flow at seadikes

Cited by 103 publications

References 2 publications

Flow Depths and Velocities at Crest and Landward Slope of a Dike, in Theory and With the Wave Overtopping Simulator

Flow Depths and Velocities at Crest and Landward Slope of a Dike, in Theory and With the Wave Overtopping Simulator

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

Ensemble prediction of coastal flood risk arising from overtopping by linking meteorological, ocean, coastal and surf zone models

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