Searched for: author:"Hofland, B."
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Shafieefar, Mehdi (author), Shekari, Mohammad Reza (author), Hofland, B. (author)
Reshaping berm breakwaters have been mainly designed and built for water depth less than 20 m. In such conditions, a toe structure may be needed to reduce bottom settlements and increase geotechnical stability in the loose subsoil condition. Also, a toe berm can be deployed to reduce the berm recession and increase the stability of the...
journal article 2020
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Dào, H.T. (author), Hofland, B. (author), Stive, M.J.F. (author), Mai, Tri (author)
Wooden fences are applied as a nature-based solution to support mangrove restoration along mangrove coasts in general and the Mekong Delta coast in particular. The simple structure uses vertical bamboo poles as a frame to store horizontal bamboo and tree branches (brushwood). Fence resistance is quantitatively determined by the drag...
journal article 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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de Almeida Sousa, E. (author), Hofland, B. (author)
This study focusses on increasing the understanding on vertical hydraulic structures with relatively short overhangs subjected to standing wave impacts. To this end, the impact velocity and the entrapped air are studied in detail, given their influence on the impulsive loading characteristics and consequently on the structural dynamic response....
journal article 2020
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de Almeida Sousa, E. (author), Hofland, B. (author)
The applicability of pressure-impulse theory is evaluated for predicting wave impact loading magnitudes for non-breaking standing wave impacts on vertical hydraulic structures with relatively short overhangs. To this end, tests were carried out on a schematized but realistic configuration with low steepness regular wave impacts on a straight...
journal article 2020
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van Meerkerk, M. (author), Poelma, C. (author), Hofland, B. (author), Westerweel, J. (author)
We present an experimental study on the variation in wave impact location and present a mechanism for the development of free surface instabilities on the wave crest for repeatable plunging wave impacts on a vertical wall. The existence of free surface instabilities on an impacting wave is well known, but their characteristics and formation...
journal article 2020
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Meinen, Nadieh Elisabeth (author), Maria, Raphaël Daniël Johannes (author), Hofland, B. (author), Jonkman, Sebastiaan N. (author)
Vertical slender hydraulic structures such as sluices, navigation locks, or storm-surge barriers are often dynamically loaded by waves. For a safe and economic design, an accurate description of the wave loads is needed. A widely used formula for this purpose is the Goda–Takahashi wave load formula (GT). It was derived for the assessment of...
journal article 2020
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van den Berg, Ileen (author), Hofland, B. (author), Reedijk, Bas (author)
Many rubble mound breakwaters are nowadays made with an armour layer consisting of single layer interlocking elements. The stability of these armour layers could well be influenced by the irregularity of the rock underlayer, as that influences the degree of interlocking. Especially for the new types of regularly placed armour, this might be...
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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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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Santos, João Alfredo (author), Lemos, Rute (author), Weimper, Julius (author), Gronz, Oliver (author), Hofland, B. (author), Sande, José (author), Pinheiro, Liliana (author), Spans, Jan H. (author), van den Bos, J.P. (author)
A set of scale-model tests was carried out at the wave basin of the Leibniz University Hannover to extend the range of wave steepness values analysed in run-up, overtopping and armour layer stability studies, focusing on oblique extreme wave conditions and on their effects on a gentler slope breakwater’s trunk armour and roundhead. The paper...
conference paper 2019
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Oosterlo, P. (author), van Vledder, G.P. (author), Hofland, B. (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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Tieleman, O.C. (author), Tsouvalas, A. (author), Hofland, B. (author), Peng, Y. (author), Jonkman, Sebastiaan N. (author)
A model is developed to predict bending vibrations of flood gates with fluid on both sides. The liquid flow is three-dimensional and the gate is represented as a thin plate. The fluid response is considered within the linear potential flow theory including the effect of compressibility and the generation of free surface waves. This way, the...
journal article 2019
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van Gent, Marcel R.A. (author), de Almeida Sousa, E. (author), Hofland, B. (author)
Physical model tests were performed in a wave flume at Deltares with rock armoured slopes. A shallow foreshore was present. At deep water, the same wave conditions were used, but by applying different water levels, the wave loading on the rock armoured slopes increased considerably with increasing water levels. This allowed an assessment of the...
journal article 2019
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Chen, X. (author), Hofland, B. (author), Molenaar, W.F. (author), Capel, Alex (author), Van Gent, Marcel R.A. (author)
This paper describes a method of determining the reaction forces of a vertical structure with an overhang to impulsive wave impacts. The aim is to develop a method to design a hydraulic structure exposed to the impulsive wave impact. At present, there is a lack of guidelines on the designing and verification with such a purpose. The impulse...
journal article 2019
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van Vledder, G.P. (author), Hofland, B. (author), Tuin, Henry (author), van Maris, Bob (author)
This paper describes a numerical evaluation of design rules for the determination of wave loads of non-breaking waves on vertical structures. Design guidelines were proposed by Sainflou (1928) and Goda (1974). These guidelines use geometric parameters of the structure, an incident wave height and a wave period. In practice (cf. CERC, 1984), a...
conference paper 2019
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Streicher, Maximilian (author), Kortenhaus, Andreas (author), Altomare, Corrado (author), Hughes, Steven (author), Marinov, Krasimir (author), Hofland, B. (author), Chen, X. (author), Suzuki, T. (author), Cappietti, Lorenzo (author)
Overtopping bore impact forces on a dike mounted vertical wall were measured in similar large-scale (Froude length scale factor 1-to-4.3) and small-scale (Froude length scale factor 1-to-25) models. The differences due to scale effects were studied, by comparing the up-scaled force measurements from both models in prototype. It was noted that if...
conference paper 2019
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de Almeida Sousa, E. (author), van Gent, Marcel R.A. (author), Hofland, B. (author)
In order to design reliable coastal structures, for present and future scenarios, universal and precise damage assessment methods are required. This study addresses this need, and presents improved damage characterization methods for coastal structures with rock armored slopes. The data used in this study were obtained from a test campaign...
journal article 2019
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de Almeida Sousa, E. (author), Hofland, B. (author), Jonkman, Sebastiaan N. (author)
The study of wave impact physics and magnitudes are key for the design of vertical coastal hydraulic structures. This research addresses the study of standing wave impacts on vertical coastal hydraulic structures with a relatively short horizontal overhang, which is especially relevant for structures such as lock gates, sluice gates, dewatering...
conference paper 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: author:"Hofland, B."
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