Searched for:
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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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Hoan, N.T. (author), Booij, R. (author), Hofland, B. (author), Stive, M.J.F. (author), Verhagen, H.J. (author)
The current research is aimed at finding a proper relation between flow forces acting on the bed and the bed response. To this end, experiments were carried out in which both the bed response (quantified by a dimensionless entrainment rate) and the flow field (velocity and turbulence intensity distributions) are measured. The three available...
conference paper 2007
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Hoan, N.T. (author), Booij, R. (author), Hofland, B. (author), Stive, M.J.F. (author), Verhagen, H.J. (author)
The current research is aimed at evaluating the applicability of a numerical flow model to predict bed damage. First, an experimental study was carried out to get more inside into the relation between flow forces acting on a bed and the bed response (damage). The experiments were then used as the basis for the evaluation. Second, the flow was...
conference paper 2008
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Tieleman, O.C. (author), Hofland, B. (author), Jonkman, S.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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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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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
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Chen, X. (author), Hofland, B. (author), Altomare, C. (author), Uijttewaal, J.S.W. (author)
In this paper the impact process and mechanism of overtopping flow on a vertical wall on a dike crest are investigated by means of a series of physical model tests. A double-peaked force was recognized in a time series of an overtoping flow. Four stages were summarized for the whole overtopping flow impact process. An empirical relationship...
conference paper 2014
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Hoan, N.T. (author), Booij, R. (author), Hofland, B. (author), Stive, M.J.F. (author), Verhagen, H.J. (author)
The current research is aimed at finding a dimensionless stability parameter for non-uniform flow in which the effect of turbulence is incorporated. To this end, experiments were carried out in which both the bed response (quantified by a dimensionless entrainment rate) and the flow field (velocity and turbulence intensity distributions) are...
conference paper 2007
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Hofland, B. (author), Rosa-Santos, Paulo (author), Taveira-Pinto, Francisco (author), de Almeida Sousa, E. (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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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
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Wenneker, I. (author), Hoffmann, Rob (author), Hofland, B. (author)
The new Delta Flume of Deltares (300 m long x 5 m wide x 9.5 m deep) is used to test wave interaction with, among others, sea defences (dikes, dunes), coastal structures (e.g. breakwaters, revetments and jetties), eco-dynamic designs and<br/>coastal morphology. The present paper presents the first outcomes of the performance tests of the flume...
conference paper 2016
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Hofland, B. (author), van gent, Marcel (author)
A method to quantify, analyse, and present the settlement of single-layer concrete armour layers of coastal structures is presented. The use of the image processing technique for settlement analysis is discussed based on various modelling<br/>studies performed over the years. The accuracy of the technique is assessed, and the application of the...
conference paper 2016
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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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Streicher, M. (author), Hofland, B. (author), Lindenbergh, R.C. (author)
Currently a new wave flume for hydraulic experiments near to prototype scale is under construction at Deltares. In the flume, modern measurement equipment will be installed. One of the potential sensor techniques is Terrestrial Laser Scanner (TLS) based range measurements of water waves. TLS range measurements are a very fast and accurate method...
conference paper 2013
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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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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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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), More Authors (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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