Laboratory Effects and Further Uncertainties Associated With Wave Overtopping Measurements

Kortenhaus, Andreas; Oumeraci, Hocine; Geeraerts, J.; Rouck, Julien De; Medina, Josep R.; González-Escrivá, Jose A.

doi:10.1142/9789812701916_0359

Cited by 10 publications

(10 citation statements)

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“…They found that there was good agreement for waves of the same incident crest height, though the data were scattered due to interference by preceding waves and some difficulties in measuring individual overtopped volumes. Pearson et al (2002) and Kortenhaus et al (2004) used weighing cells to determine individual overtopping volumes. The latter found this technique to be more accurate than using either a wave gauge in an overtopping tank or a pair of pressure transducers at the floor of the tank.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement of focused wave group and solitary wave overtopping

Raby

Borthwick

Stansby

et al. 2011

Journal of Hydraulic Research

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Prediction of individual wave overtopping events is important in assessing danger to life and property, but data are sparse and hydrodynamic understanding is lacking. Laboratory-scale waves of three distinct types were generated at the Coastal Research Facility to model extreme waves overtopping a trapezoidal embankment. These comprised wave groups of compact form, wave groups embedded in a background wave field, and a solitary wave. The inshore wave propagation was measured and the time variation of overtopping rate estimated. The total volume overtopped was measured directly. The experiments provide well-defined data without uncertainty due to the effect of reflection on the incident wave train. The dependence of overtopping on a range of wave shapes is thus determined and the influence of wave -wave interactions on overtopping assessed. It was found that extreme overtopping may arise from focused waves with deep troughs rather than large crests. Furthermore, overtopping waves can be generated from small wave packets without affecting the applicability of results to cases in which there are surrounding waves. Finally, overtopping from a solitary wave is comparable with overtopping from focused wave groups of the same amplitude.

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Section: Introductionmentioning

confidence: 99%

Experimental measurement of focused wave group and solitary wave overtopping

Raby

Borthwick

Stansby

et al. 2011

Journal of Hydraulic Research

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“…An RS Instruments load cell was employed for the measurement of wave overtopping quantities following the findings of Kortenhaus et al 8 regarding the accuracy of different methods of measuring wave overtopping discharges. A rectangular container in which overtopping water was to be collected was suspended from the load cell mounted on a rigid beam placed across the concrete walls of the wave flume.…”

Section: Methodsmentioning

confidence: 99%

Wave run-up and overtopping over smooth and rock slopes of coastal structures without crown walls

Wijetunge

2008

J. Natn. Sci. Foundation Sri Lanka

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This paper is concerned with a comparatively large-scale laboratory investigation carried out to examine the overtopping performance of a straight, rock slope without a crown wall. Measurements made over a smooth slope to verify the reliability of the experimental setup are also reported. The wave run-up and overtopping data from the present tests with regular waves, when appropriately scaled based on the assumption of Rayleigh distribution for wave heights, show good agreement with corresponding data from irregular waves. The average overtopping discharges over the smooth and rock slopes have also been compared with different models available in the literature. Moreover, the overtopping rates for the comparatively large-scale rock slope tested in the present study show good agreement with the previous measurements reported in Van der Meer when scaled with a roughness reduction factor of 0.55. The overtopping measurements for the rock slope without a crown wall have also been compared with the overtopping model employed by Bradbury and Allsop for their measurements over rock slopes with crown walls.

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“…Results from field measurements or from large-scale laboratory tests are rather rare. Studies have been performed only recently under the CLASH project Geeraerts & Boone, 2004;Geeraerts & Willems, 2004;Hordijk, 2004;Kortenhaus et al, 2004a;Pullen & Allsop, 2004a in order to fill this gap and allow investigation of both the model and scale effects [Kortenhaus et al, 2004bde Rouck et al, 2005]. One of the conclusions arising from the investigations identifies the number of incident random waves during physical model tests as a key model effect.…”

Section: Introductionmentioning

confidence: 99%

“…If extreme statistics are required from the tests, such as the maximum wave height, the maximum run-up level and the peak overtopping volume, then Pullen & Allsop [2003] suggest the use of 1,000 waves or more, and Kortenhaus et al [2004b] recommend that the number of waves should certainly exceed 1,000, and should preferably be greater than 2,000. If armor stability is to be determined, Matsumi et al [2004] propose a minimum of 600 incident random waves, despite the fact that the most common value in the literature is 1,000, as noted by Wolters [2007].…”

Section: Introductionmentioning

confidence: 99%

“…If armor stability is to be determined, Matsumi et al [2004] propose a minimum of 600 incident random waves, despite the fact that the most common value in the literature is 1,000, as noted by Wolters [2007]. As far as overtopping is concerned, Kortenhaus et al [2004b] recommended a minimum of 1,000 waves in order to reduce the influence of variations in armor layer construction, since this influence is higher when the number of incident waves is small.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Lengths of Scale Model Tests to Determine Mean Wave Overtopping Discharges

Reis

Neves

Hedges

2008

Coastal Engineering Journal

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This paper analyses the influence on the measured mean overtopping discharge of the duration of physical model tests of wave overtopping, bearing in mind the practical purpose of the studies, and the required accuracy of the measurements. The case study of the South Breakwater of Póvoa de Varzim Harbor, Portugal, is used to investigate this subject. During the two-dimensional physical model tests, three main target test conditions were used. For each one, different wave trains were utilized, all conforming to the same target JONSWAP spectrum, and three different test durations were employed. The number of random waves ranged from about 300 to 2400. Then, one of the three main test conditions was again used, but for twelve different test durations. In this case, the number of waves ranged from about 150 to 1900.The results suggest that the convergence of the mean overtopping discharge to a constant value with increasing test duration is not obvious. Regardless of the test duration, the information obtained with a single test gives limited information about the expected mean discharge, as the mean overtopping discharge varies even for the same wave and structure characteristics. Consequently, more information is obtained on the mean discharge if several tests of the same short duration (but with different time series) are undertaken rather than if one test of long duration is carried out.

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Laboratory Effects and Further Uncertainties Associated With Wave Overtopping Measurements

Cited by 10 publications

References 0 publications

Experimental measurement of focused wave group and solitary wave overtopping

Experimental measurement of focused wave group and solitary wave overtopping

Wave run-up and overtopping over smooth and rock slopes of coastal structures without crown walls

Investigating the Lengths of Scale Model Tests to Determine Mean Wave Overtopping Discharges

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