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- 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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- 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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van Vledder, G.P. (author), Hofland, Bas (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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Hofland, Bas (author), Passos, Marlon (author), de Almeida Sousa, E. (author)Flood gates in storm surge barriers or outlet sluices can be prone to violent wave impacts. When an obstruction is present at the sea side above the gate, confinement of the incoming waves can lead to impulsive wave loads, even when the waves are non-breaking. The large loads can increase the stresses in the gate and structure considerably. One...conference paper 2019
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de Almeida Sousa, E. (author), Hofland, Bas (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, Bas (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
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Ponsioen, Luc (author), van Damme, M. (author), Hofland, Bas (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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van Gent, Marcel R.A. (author), de Almeida Sousa, E. (author), Hofland, Bas (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, Bas (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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Santos, João Alfredo (author), Lemos, Rute (author), Weimper, Julius (author), Gronz, Oliver (author), Hofland, Bas (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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Tieleman, Orson (author), Tsouvalas, A. (author), Hofland, Bas (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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de Almeida Sousa, E. (author), van Gent, Marcel R.A. (author), Hofland, Bas (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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Streicher, Maximilian (author), Kortenhaus, Andreas (author), Altomare, Corrado (author), Hughes, Steven (author), Marinov, Krasimir (author), Hofland, Bas (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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Hofland, Jelle (author)Automation in a domestic environment is not flawless and human interference will be necessary, for implementing robots in this environment. <br/>When remotely controlling semi-autonomous robots, proposed concepts can be divided into two main concepts: To trade control back and forth between the human and the operator and to share control...master thesis 2018
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Hofland, Bernice (author)Infrastructure projects in the construction industry are complex. This complexity leads to unavoidable changes in scope. When scope changes are not formalized and managed correctly, it is a risk contributing to project failure. A scope change that is not formalized is scope creep. This research looks at the causes and effects of scope creep in...master thesis 2018
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Esteban, Miguel (author), Takabatake, Tomoyuki (author), Glasbergen, Toni (author), Hofland, Bas (author), Nishida, Yuta (author), Nishiazaki, Shinsaku (author), Stolle, Jacob (author), Nistor, Ioan (author), Takagi, Hiroshi (author), Bricker, J.D. (author), Shibayama, Tomoya (author)In the aftermath of the 2011 Tohoku Earthquake and Tsunami Japanese tsunami protection philosophy now dictates that coastal defences should prevent the land that they protect from being flooded under a Level 1 event (with a return period in the order of about 100 years). To ascertain the overtopping mechanism and leeward inundation heights of...conference paper 2018
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de Almeida Sousa, E. (author), van Gent, Marcel (author), Hofland, Bas (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 armoured slopes. The data used in this study was obtained from a test campaign...conference paper 2018
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van Gent, Marcel (author), de Almeida Sousa, E. (author), Hofland, Bas (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 allows the assessment of...conference paper 2018
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Hofland, Bas (author), Arefin, Syed Shamsil (author), van der Lem, Cock (author), van Gent, Marcel (author)This paper describes a method to measure the rocking motion of lab-scale armour units. Sensors as found in mobile phones are used. These sensors, data-storage and battery are all embedded in the model units, such that they can be applied without wires attached to them. The technique is applied to double-layer units in order to compare the...conference paper 2018
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- Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, Bas (author), van Vledder, G.P. (author) abstract 2018