First research outputs of Theme A and E are becoming available, some of which we developed with other research projects.
Found 68 Outputs - Page 4 of 7
An investigation of stress inaccuracies and proposed solution in the material point method (MPM)
Three modifications to MPM are implemented, and together these are able to remove almost all of the observed oscillations in the model.
14/11/2019 by Guido Remmerswaal et al.
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Evaluating residual dike resistance using the Random Material Point Method
The resistance against flooding after initial failure due to slope instability of an idealised dike reduces the probability of flooding by 25% with respect to the initial failure.
01/05/2021 by Guido Remmerswaal et al.
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Inside the black box of collaboration: a process-tracing study of collaborative flood risk governance in the Netherlands
This study suggests that well-organised processes of principled engagement facilitated by adaptive and connective leaders may compensate for lack of shared motivation among collaborating parties and succeed in delivering desired collaborative outputs without investing much in building trust and shared motivation.
11/10/2021
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Integrated coastal flood design strategies: changing paradigm in flood risk management
Exploring future spatial visions by accepting water overtopping, using temporary dikes, and implementing changes in land use and building regulation.
08/10/2021 by Luca Iuorio et al.
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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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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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