Searched for: subject:"overtopping"
(1 - 20 of 187)

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van Gent, M.R.A. (author)
The amount of wave overtopping at coastal structures such as vertical caisson breakwaters is strongly dependent on the angle of wave attack. The reducing effects of oblique waves on wave overtopping compared to perpendicular wave attack has been studied by means of three-dimensional wave basin tests. In these physical model tests the caisson...
journal article 2021
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Koosheh, Ali (author), Etemad-Shahidi, Amir (author), Cartwright, Nick (author), Tomlinson, Rodger (author), van Gent, M.R.A. (author)
Conventionally, allowable mean overtopping discharge is used as a design criterion for coastal structures. The mean overtopping discharge needs to be limited to ensure structural stability as well as the safety of people, vehicles, and properties behind the structure. Nowadays, limits for the maximum individual overtopping volumes are also...
review 2021
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Jonker, R.G. (author)
In this research OpenFOAM is used to model and determine the complex hydrodynamic behaviour of a Homogeneous low-crested structure (HLCS) consisting of cubipod artificial concrete elements. The validated model is used to gain insight in the design sensitivities of a two dimensional cross sectional layout to reduce sea wall overtopping. HLCS and...
master thesis 2020
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Moretto, Marco (author)
Worldwide, rubble mound breakwaters are designed and built to shelter and protect coastal areas from overtopping and flooding, especially harbours and shorelines. Rubble mound breakwaters are essential to preserve desired hydraulic conditions within the hinterland, avoiding damage to inhabited or industrial areas. This research focuses on the...
master thesis 2020
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Wegman, Rik (author)
Wave overtopping is responsible for many dike failures, dike breaches and severe flooding. The erosion resistance of dikes to overtopping waves is determined by the strength of the grass cover. Therefore, a thorough understanding of the erosion resistance of grass covers is desired to enable a good and effective dike management. In the existing...
master thesis 2020
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Esteban, Miguel (author), Roubos, Jochem Jan (author), Iimura, Kotaro (author), Salet, Jorrit Thomas (author), Hofland, B. (author), Bricker, J.D. (author), Ishii, Hidenori (author), Hamano, Go (author), Takabatake, Tomoyuki (author), Shibayama, Tomoya (author)
The accurate modelling of overtopping of coastal defences by tsunami waves is of vital importance for the formulation of disaster management strategies. To improve knowledge of this phenomena the authors conducted experiments on coastal structure overtopping using bores that were generated by a dam-break mechanism. Three types of structures...
journal article 2020
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Nguyen, H. (author), Hofland, B. (author), Chinh, Vu Dan (author), Stive, M.J.F. (author)
The spectral wave period T<sub>m-1,0</sub> at the toe of sea-dikes is a crucial parameter to predict wave overtopping discharge over sea-dikes. It is known from literature that this period quickly increases when waves reach shallow foreshores; however, sometimes the assumption is made that the wave period remains constant from offshore to...
journal article 2020
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Dan, Sebastian (author), Altomare, Corrado (author), Suzuki, T. (author), Spiesschaert, Tim (author), Verwaest, Toon (author)
Physical model experiments were conducted in a wave tank at Flanders Hydraulics Research, Antwerp, Belgium, to characterize the wave overtopping and impact force on vertical quay walls and sloping sea dike (1:2.5) under very oblique wave attack (angle between 45° and 80°). This study was triggered by the scarce scientific literature on the...
journal article 2020
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Altomare, Corrado (author), Gironella, Xavi (author), Suzuki, T. (author), Viccione, Giacomo (author), Saponieri, Alessandra (author)
Design criteria for coastal defenses exposed to wave overtopping are usually assessed by mean overtopping discharges and maximum individual overtopping volumes. However, it is often difficult to give clear and precise limits of tolerable overtopping for all kinds of layouts. A few studies analyzed the relationship between wave overtopping...
journal article 2020
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Suzuki, T. (author), Altomare, Corrado (author), Yasuda, Tomohiro (author), Verwaest, Toon (author)
Due to ongoing climate change, overtopping risk is increasing. In order to have effective countermeasures, it is useful to understand overtopping processes in details. In this study overtopping flow on a dike with gentle and shallow foreshores are investigated using a non-hydrostatic wave-flow model, SWASH (an acronym of Simulating WAves till...
journal article 2020
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Jordans, Luuk (author)
“During the last safety assessment of Rijkswaterstaat in 2006 the Afsluitdijk failed on the current safety standards regarding flood protection. A new design was needed which ensured continuous protection against flooding in the future. Large scale and small scale tests are performed to optimize the design. Clear differences in the average wave...
master thesis 2019
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van Melis, Tijmen (author)
Wave overtopping is an important aspect for the design of rubble mound breakwaters. Acceptable overtopping limits are usually based on the mean overtopping discharge or the maximum overtopping volume (EurOtop, 2018). For temporary situations, such as breakwaters under construction, overtopping limits are not clearly defined. This complicates the...
master thesis 2019
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Patil, Akshay (author)
Rapid climate change and the corresponding estimated sea level rise can affect the performance of the coastal defense structures such as breakwaters, seawalls, and dikes. In order to improve these coastal defenses, a detailed understanding of the processes which contribute to wave run-up and overtopping over the coastal defenses needs to be...
master thesis 2019
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Zhang, Yuxi (author)
Churchill Barriers, a series of four causeways in Orkney Islands, Scotland were constructed during Second World War and now serve and a critical link for South Ronaldsay and Burray to the Orkney Mainland. Due to their location and design, causeways are exposed to storm waves generated in the North Sea. During coastal storms, some waves are able...
master thesis 2019
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Zaalberg, Piet (author)
OpenFOAM allowed the author to simulate a large number of scenarios in which the influences of cross-shore profile shape, cobble porosity, cobble diameter and layer thickness on wave overtopping were examined. Four validation runs and six simulations to map the sensitivity are compared with data from two physical experiments conducted in the...
master thesis 2019
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Mann, Mathijs (author)
The port of Rotterdam was full and new mooring locations were required to host the largest ships in the world. And if there’s no space to expand on land, why not create land in the sea? That is exactly what The Netherlands did by creating Maasvlakte 2. The construction of Maasvlakte 2 started in 2008 and was officially completed on May 22nd ,...
master thesis 2019
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Çete, Ceylan (author)
It is already acknowledged that Nature-based Solutions can be used to attenuate waves, however it is still uncertain to what extent the vegetation can contribute to decreasing the flood risk. So far mainly small-scale tests have been performed to quantify wave attenuating properties of vegetation. To quantify the effect of more extreme wave...
master thesis 2019
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Huppes, Niek (author)
After more than 85 years, the iconic Afsluitdijk is in need of a reinforcement. During the latest safety assessment of Rijkswaterstaat the dike did not meet the standards at two components; the amount of wave overtopping (&gt;10 l/m/s) and armour stability. This research goes into detail about the overtopping on the Afsluitdijk. In the new...
master thesis 2019
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Ponsioen, Luc (author), van Damme, M. (author), Hofland, B. (author), Peeters, Patrik (author)
A high quality safety assessment of levee systems requires a good prediction of when the grass cover of levees fail. Current methods relate the onset of failure to the peak in momentum or energy of the flow, instead of the peak in momentum transfer or energy transfer to the grass cover. The critical velocity necessary in the current methods...
journal article 2019
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Streicher, Maximilian (author), Kortenhaus, Andreas (author), Marinov, Krasimir (author), Hirt, Matthias (author), Hughes, Steven (author), Hofland, B. (author), Scheres, Babette (author), Schüttrumpf, Holger (author)
Short duration bores in the coastal zone are generated by wave breaking in shallow water and mild foreshore conditions. In storm weather situations and for sea level rise scenarios, these bores approach the dike and interact with previously overtopped or reflected bores. Combined laser scanner and video measurements were used to study the...
journal article 2019
Searched for: subject:"overtopping"
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