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First research outputs of Theme A and E are becoming available, some of which we developed with other research projects.

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Found 37 Outputs - Page 1 of 4

Comparison of Implicit and Explicit Vegetation Representations in SWAN Hindcasting Wave Dissipation by Coastal Wetlands in Chesapeake Bay

Assessing the accuracy of nearshore numerical models—such as SWAN—is important to ensure their effectiveness in representing physical processes and predicting flood hazards. Results show that treating vegetation simply as enhanced bottom roughness (implicitly) underestimates wave energy dissipation. The explicit vegetation representation, however, shows good agreement with field data.

24/12/2018 by Christopher H. Lashley et al.

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Nonhydrostatic and surfbeat model predictions of extreme wave run-up in fringing reef environments

Short-wave resolving and averaged modes of the XBeach model were used to simulate run-up over two laboratory fringing reef profiles. This way we provide insight into the physical processes governing run-up in such environments; and evaluate the performance of both modes in accurately predicting run-up over a wide range of conditions.

01/07/2018 by Christopher H. Lashley et al.

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Contribution of Infragravity Waves to Run-up and Overwash in the Pertuis Breton Embayment (France)

The analysis shows that gravity waves rapidly decrease across the embayment while infragravity (IG) waves are enhanced. These findings show that the contribution of IG waves to dune overwash along the bay is significant and highlight the need for any method or model to consider IG waves when applied to similar environments.

02/07/2019

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Benchmarking of numerical models for wave overtopping at dikes with shallow mildly sloping foreshores

Overtopping is an order of magnitude lower when infragravity waves are neglected. Using more computationally-demanding models does not guarantee improved accuracy. Despite well-modelled infragravity waves, XBeach Surfbeat underestimates overtopping. With empirical corrections, phase-averaged models like SWAN can account for infragravity waves.

01/08/2020 by Christopher H. Lashley et al.

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

Here, we combine physical and numerical modeling to: (1) assess the influence of various offshore, foreshore, and dike slope conditions on the dominance of infragravity waves (IG) waves over those at sea and swell (SS) frequencies; and (2) develop a predictive model that allows practitioners to quickly estimate the relative magnitude of IG.

11/06/2020 by Christopher H. Lashley et al.

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Formulating Wave Overtopping at Vertical and Sloping Structures with Shallow Foreshores Using Deep-Water Wave Characteristics

Accurate estimates of wave height and period at the structure toe often proves difficult and requires the use of either physical modeling or high-resolution numerical wave models. Here, we follow Goda's method to establish an accurate prediction by directly incorporating the foreshore slope and the relative water depth at the structure toe.

31/08/2021 by Christopher H. Lashley et al.

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The Influence of Infragravity Waves on the Safety of Coastal Defences: A Case Study of the Dutch Wadden Sea

A newly developed framework not to overestimate safety along the many coastlines around the world that have shallow foreshores (e.g. saltmarshes and mudflats). Considering the influence of very long waves, which are often neglected in flood risk assessments is important when calculating the likelihood of waves overtopping the dikes.

01/11/2021 by Christopher H. Lashley et al.

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Human interventions in a bifurcating river system: Numerical investigation and uncertainty assessment

For intervention design in a bifurcating river, it is important to consider the entire river system and explicitly account for a range of discharge conditions to avoid unwanted water level increases throughout the river system.

05/10/2021 by Matthijs R.A. Gensen et al.

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Shields-Darcy piping-model. Difference analysis with Sellmeijer and D-GeoFlow

Analyse naar de verschillen tussen de Sellmeijer regel en het Shields-Darcy voor piping, met focus op de modelaannames en schaaleffecten

27/10/2021 by Joost Pol

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Contains: Conference proceedings Publication upon journal access Report

Progression rate of backward erosion piping in laboratory experiments and reliability analysis

Statistische analyse van pipegroeisnelheden in bestaande labproeven, en een studie naar de potentie van het meenemen van tijdsafhankelijke pipegroei in faalkansanalyse van dijken.

27/10/2021

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