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The influence of infragravity waves on the safety of coastal defences: a case study of the Dutch Wadden Sea

Lashley, Christopher H. (author), Jonkman, Sebastiaan N. (author), van der Meer, J.W. (author), Bricker, J.D. (author), Vuik, V. (author)

Many coastlines around the world are protected by dikes with shallow foreshores (e.g. salt marshes and mudflats) that attenuate storm waves and are expected to reduce the likelihood and volume of waves overtopping the dikes behind them. However, most of the studies to date that assessed their effectiveness have excluded the influence of...

journal article 2022

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Field measurements of very oblique wave run-up and overtopping with laser scanners

Oosterlo, P. (author), Hofland, Bas (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author)

This paper presents the first field measurements with an innovative laser scanner system, during an actual severe winter storm with very oblique wave attack. The goal of this paper is to validate this innovative system for measuring wave run-up and wave overtopping parameters during storms with very oblique wave attack. The paper describes the...

journal article 2021

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Calibration and preparation of field measurements of oblique wave run-up and overtopping on dikes using laser scanners

Oosterlo, P. (author), Hofland, Bas (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author)

Wave overtopping is typically measured in the field using overtopping tanks. In this paper, an alternative system is developed that uses two laser scanners. The system also measures wave run-up, as well as run-up depths and velocities, both during perpendicular and oblique waves on a dike in the field. The paper considers the first calibration...

journal article 2021

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Field Measurements of Very Oblique Wave Run-up and Overtopping with Laser Scanners

Oosterlo, P. (author), Hofland, Bas (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author)

Oosterlo et al. (2019) developed a system using two terrestrial laser scanners, which can measure run-up heights, depths and velocities of waves on a dike in field situations. The system has now been placed next to two overtopping tanks on a dike in the Eems-Dollard estuary in the Netherlands to measure during actual severe winter storms. The...

abstract 2020

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Relative Magnitude of Infragravity Waves at Coastal Dikes with Shallow Foreshores: A Prediction Tool

Lashley, Christopher H. (author), Bricker, J.D. (author), van der Meer, J.W. (author), Altomare, Corrado (author), Suzuki, T. (author)

Despite the widely recognized role of infragravity (IG) waves in many often-hazardous nearshore processes, spectral wave models, which exclude IG-wave dynamics, are often used in the design and assessment of coastal dikes. Consequently, the safety of these structures in environments where IG waves dominate remains uncertain. Here, we combine...

journal article 2020

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Benchmarking of numerical models for wave overtopping at dikes with shallow mildly sloping foreshores: Accuracy versus speed

Lashley, Christopher H. (author), Zanuttigh, B. (author), Bricker, J.D. (author), van der Meer, J.W. (author), Altomare, Corrado (author), Suzuki, T. (author), Roeber, Volker (author), Oosterlo, P. (author)

Practitioners often employ diverse, though not always thoroughly validated, numerical models to directly or indirectly estimate wave overtopping (q) at sloping structures. These models, broadly classified as either phase-resolving or phase-averaged, each have strengths and limitations owing to the physical schematization of processes within...

journal article 2020

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Measuring (Oblique) Wave Run-Up and Overtopping with Laser Scanners

Oosterlo, P. (author), Hofland, Bas (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author), Nieuwenhuis, Jan-Willem (author), van Vledder, G.P. (author), Steetzel, Henk (author), Reneerkens, Michiel (author)

Wave overtopping is commonly measured using overtopping tanks. In this paper, an alternative system is developed by using two laser scanners. It measures wave run-up, as well as layer thicknesses and front velocities, both during normally and obliquely incident waves on a dike in the field. The paper considers the first field validation tests...

conference paper 2019

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Measuring oblique wave run-up and overtopping with laser scanners

Oosterlo, P. (author), Hofland, Bas (author), van der Meer, J.W. (author), Overduin, Maarten (author), Steendam, Gosse Jan (author), Nieuwenhuis, Jan-Willem (author), van Vledder, G.P. (author), Steetzel, Henk (author), Reneerkens, Michiel (author)

abstract 2019

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Wave modelling and field measurements in a complex estuary

Oosterlo, P. (author), van Vledder, G.P. (author), Hofland, Bas (author), van der Meer, J.W. (author), Geleynse, Nathanaël (author), Reneerkens, Michiel (author), Steendam, Gosse Jan (author), Veendorp, Marco (author)

abstract 2019

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Modelling for analysis of refraction effects on overtopping in a complex estuary

Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, Bas (author), van Vledder, G.P. (author)

abstract 2018

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Wave modelling in a complex estuary: Study in preparation of field measurement campaign Eems-Dollard estuary

Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, Bas (author), van Vledder, G.P. (author)

This paper considers the Eems-Dollard estuary in the north of the Netherlands, which is part of the shallow shelf sea the Wadden Sea. This estuary is a highly complex area with tidal flats and deep channels and is characterised by an offshore directed wind, posing a challenge to wave prediction models. As little measurements are available, a...

conference paper 2018

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Probabilistic Assessment of Overtopping of Sea Dikes with Foreshores including Infragravity Waves and Morphological Changes: Westkapelle Case Study

Oosterlo, P. (author), McCall, R.T. (author), Vuik, V. (author), Hofland, Bas (author), van der Meer, J.W. (author), Jonkman, Sebastiaan N. (author)

Shallow foreshores in front of coastal dikes can reduce the probability of dike failure due to wave overtopping. A probabilistic model framework is presented, which is capable of including complex hydrodynamics like infragravity waves, and morphological changes of a sandy foreshore during severe storms in the calculations of the probability of...

journal article 2018

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First Tests on the Symmetrical Breakwater Armor Unit Crablock

Salauddin, M (author), Broere, A. (author), van der Meer, J.W. (author), Verhagen, H.J. (author), Bijl, E (author)

Single layer concrete armor systems are being widely used nowadays in the design of rubble mound breakwaters. Recently, a new concrete armor unit has been developed and applied as single layer armor system in the repair works of one damaged breakwater at Al Fujeirah, UAE. It has a symmetrical shape, in contrast to most other units. Modern...

journal article 2017

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A New Symmetrical Unit for Breakwater Armour: First Tests

Salauddin, M. (author), Broere, A. (author), Van der Meer, J.W. (author), Verhagen, H.J. (author), Bijl, E. (author)

A new and symmetrical single layer armour unit, the crablock, has been designed in the UAE. One breakwater was reconstructed with crablock, but very limited testing had been performed. Just to become more acquainted with this new unit, pre-competitive research at a university has been performed, which is the subject of this paper. Being a new...

conference paper 2015

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Wave overtopping simulator tests on Vietnamese sea dikes

Trung, L.H. (author), Van der Meer, J.W. (author), Verhagen, H.J. (author)

Little is known about the strength of the land-side slopes of the Vietnamese sea dikes under overtopping attack. Some grass-covered slopes were tested by a wave overtopping simulator. The paper describes the simulator and presents the test results. The tested grass covers could withstand overtopping rates varying from 20 l/s to 100 l/s per meter...

journal article 2014

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Notional Permeability

Kik, R. (author), Van den Bos, J.P. (author), Maertens, J. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author)

Different layer design of a rock slope and under layers has a large effect on the strengths on the rock slope itself. In the stability formula developed of VAN DER MEER [1988] this effect is represented by the term Notional Permeability with symbol P. A more open, or permeable, structure underneath the armour layer has the ability to dissipate...

conference paper 2012

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Strength of the landward slopes of sea dikes in Vietnam

Trung, L.H. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author), Cat, V.M. (author)

The landware slopes of sea dikes in the north of Vietnam are steep and solely constructed by soil covered with grass due to the budget constraints and also the out-of-date design guidelines.The resistance against erosion due to wave overtopping of several grass covered slopes were tested with the Wave Overtopping Simulator to show if a slope...

conference paper 2012

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Wave overtopping resistance of grassed slopes in Viet Nam

Trung, L.H. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author)

The Simulator was applied to test the resistance against wave overtopping of grass covered dike slopes in Viet Nam. Observation and measurement during destructive tests were performed to investigate the development process of damage induced by overtopping flow. Damages were likely to be initiated at transition of either geometry or materials, at...

conference paper 2011

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Wave overtopping resistance of grassed dike slopes in Vietnam

Trung, L.H. (author), Van der Meer, J.W. (author), Luong, N.Q. (author), Verhagen, H.J. (author), Schiereck, G.J. (author)

The resistance of various grassed slopes against wave overtopping has been appraised by means of the Wave Overtopping Simulator in situ for a couple of years in Viet Nam. Destructive test results show that a dike slope covered with grass could suffer a certain overtopping discharge not smaller than 20 l/s per m. During testing it was difficult...

conference paper 2011

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Flow depths and velocities at crest and landward slope of a dike, in theory and with the wave overtopping simulator

Van der Meer, J.W. (author), Hardeman, B. (author), Steendam, G.J. (author), Schüttrumpf, H. (author), Verheij, H.J. (author)

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...

conference paper 2011