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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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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 (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 allows the assessment of...
conference paper 2018
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Esteban, Miguel (author), Takabatake, Tomoyuki (author), Glasbergen, Toni (author), Hofland, B. (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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Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, B. (author), van Vledder, G.P. (author)
This paper considers the Eems-Dollard estuary in the north of the Netherlands, which is part of the shallow shelf sea the Wadden Sea. This estuary is a highly complex area with tidal flats and deep channels and is characterised by an offshore directed wind, posing a challenge to wave prediction models. As little measurements are available, a...
conference paper 2018
document
de Almeida Sousa, E. (author), van gent, Marcel (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 armoured slopes. The data used in this study was obtained from a test campaign...
conference paper 2018
document
Shen, Y. (author), Wang, Jinguo (author), Lindenbergh, R.C. (author), Hofland, B. (author), Ferreira, Vagner G. (author)
The use of a terrestrial laser scanner is examined to measure the changes of rock slopes subject to a wave attack test. Real scenarios are simulated in a water flume facility using a wave attack experiment representing a storm of 3000 waves. The stability of two rock slopes of different steepness was evaluated under the set conditions. For...
journal article 2018
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Hofland, B. (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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Lemos, Rute (author), Fortes, Conceição J.E.M. (author), Mendonca, Ana (author), Rosa-Santos, Paulo (author), Taveira-Pinto, Francisco (author), de Almeida Sousa, E. (author), Hofland, B. (author)
No âmbito do projeto HYDRALAB+ (H2020-INFRAIA-2014-2015), foi realizado no LNEC um conjunto de ensaios em modelo físico bidimensional (2D) de um perfil de um quebra-mar de talude em enrocamento, construído à escala geométrica 1:30, para diferentes condições de agitação marítima e níveis de maré correspondentes a cenários de alterações climáticas...
conference paper 2018
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Oosterlo, P. (author), van der Meer, J.W. (author), Hofland, B. (author), van Vledder, G.P. (author)
abstract 2018
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Oosterlo, P. (author), McCall, R.T. (author), Vuik, V. (author), Hofland, B. (author), van der Meer, J.W. (author), Jonkman, Sebastiaan N. (author)
Shallow foreshores in front of coastal dikes can reduce the probability of dike failure due to wave overtopping. A probabilistic model framework is presented, which is capable of including complex hydrodynamics like infragravity waves, and morphological changes of a sandy foreshore during severe storms in the calculations of the probability of...
journal article 2018
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Tieleman, O.C. (author), Hofland, B. (author), Jonkman, Sebastiaan N. (author)
This paper describes a first case study of the application of a newly developed fluid-structure interaction model to the design of flood gates. The gates in the Afsluitdijk, that will be replaced in the coming years, are considered. Due to the presence of a concrete beam in front of the gates breaking wave can occur, leading to high impact...
conference paper 2018
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Esteban, Miguel (author), Glasbergen, Toni (author), Takabatake, Tomoyuki (author), Hofland, B. (author), Nishizaki, Shinsaku (author), Nishida, Yuta (author), Stolle, Jacob (author), Nistor, Ioan (author), Bricker, J.D. (author), Takagi, Hiroshi (author), Shibayama, Tomoya (author)
Following the 2011 Tohoku Earthquake and Tsunami, Japanese tsunami protection guidelines stipulate that coastal defences should ensure that settlements are shielded from the coastal inundation that would result from Level 1 tsunami events (with return periods in the order of about 100 years). However, the overtopping mechanism and leeward...
journal article 2017
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Shen, Y. (author), Lindenbergh, R.C. (author), Hofland, B. (author), Kramer, R. (author)
For better understanding how coastal structures with gentle slopes behave during high energy events, a wave attack experiment representing a storm of 3000 waves was performed in a flume facility. Two setups with different steepness of slope were compared under the same conditions. In order to quantify changes in the rock slopes after the wave...
conference paper 2017
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Hofland, B. (author), Rosa-Santos, Paulo (author), Taveira-Pinto, Francisco (author), Lemos, Rute (author), Mendonça, A. (author), Juana Fortes, C (author)
This paper studies novel ways to evaluate armour damage in physical models of coastal structures. High-resolution damage data for reference rubble mound breakwaters obtained under the HYDRALAB+ joint-research project are analysed and discussed. These tests are used to analyse the way to describe damage, the influence of the sequence of testing,...
conference paper 2017
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Hofland, B. (author), Chen, X. (author), Altomare, Corrado (author), Oosterlo, P. (author)
During the last decades, the spectral wave period Tm-1,0 has become accepted as a characteristic wave period when describing the hydraulic attack on coastal structures, especially over shallow foreshores. In this study, we derive an empirical prediction formula for Tm-1,0 on shallow to extremely shallow...
journal article 2017
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Okumura, N. (author), Jonkman, Sebastiaan N. (author), Esteban, M (author), Hofland, B. (author), Shibayama, T (author)
This paper presents a methodology for tsunami risk assessment, which was applied to a case study in Kamakura, Japan. This methodology was developed in order to evaluate the effectiveness of a risk-reducing system against such hazards, also aiming to demonstrate that a risk assessment is possible for these episodic events. The tsunami risk...
journal article 2017
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Streicher, Maximilian (author), Kortenhaus, Andreas (author), Altomare, Corrado (author), Gruwez, Vincent (author), Hofland, B. (author), Chen, X. (author), Marinov, Krasimir (author), Scheres, Babette (author), Schüttrumpf, Holger (author), Hirt, Matthias (author), Cappietti, Lorenzo (author), Esposito, Andrea (author), Saponieri, Alessandra (author), Valentini, Nico (author), Tripepi, Giuseppe (author), Di Risio, Marcello (author), Aristodemo, Francesco (author), Damiani, Leonardo (author), Willems, Marc (author), Vanneste, Dieter (author), Suzuki, T. (author), Klein Breteler, Mark (author), Kaste, Dorothea (author)
Overtopping wave loads on vertical structures on top of a dike have been investigated in several small scale experiments in the past. A large-scale validation for a mild foreshore situation is still missing. Hence the WALOWA experimental campaign was carried out to address this topic. In the present paper the objectives of the WALOWA project are...
conference paper 2017
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Hofland, B. (author)
Foto's van de schade in 1953 bij Halsteren, de noodmaatregelen en het herstel daarna. Beschrijving en tekeningen van de situatie uit het Verslag van de Stormvloed.
report 2016
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Hofland, B. (author), Marissen, R. (author), Bergsma, O.K. (author)
Proof-of-concept model tests on a novel self-deploying on-shore tsunami barrier were executed. The tsunami barrier consists of a membrane, floater and cables that are stored underground. Due to buoyancy the barrier self-deploys when struck by a tsunami. The membrane and cables consist of the strong, flexible and light-weight material Dyneema...
conference paper 2016
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