Searched for: subject:"breakwater"
(1 - 20 of 203)

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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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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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Khuong, T.C. (author)
An accurate prediction of shoreline changes behind detached breakwaters is, in regard to the adjustment to the environmental impact, still a challenge for designers and coastal managers. This research is expected to fill the gaps in the estimation of shoreline changes by developing new and generalized relationships of the shoreline changes to...
doctoral thesis 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
studies performed over the years. The accuracy of the technique is assessed, and the application of the...
conference paper 2016
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Van den Bos, J.P. (author), Verhagen, H.J. (author), Kuiper, C. (author)
This paper presents the results of a systematic validation of numerical simulation of reflection and transmission of rubble-mound breakwater structures. The aim of the study is to provide a body of validation measurements for increasingly complex situations, starting simple and building up the comlexity in terms of breawater geometry, wave...
conference paper 2015
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Verpoorten, S.P.K. (author), Ockeloen, W.J. (author), Verhagen, H.J. (author)
Since 1977 dedicated studies are made to the stability of rubble mound break-water toes under wave attack. A large number of stability methods is available, but prediction accuracy is low and validity ranges are too small for use in prac-tice. In this research the decoupled model approach is used to evaluate predic-tion capacity of existing toe...
conference paper 2015
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Salauddin, M. (author)
In the design of rubble mound breakwaters, nowadays single layer systems using concrete armour units have become more common practice compared to conventional two layer systems. However, after the introduction of the accropode in eighties, a small number of single layer armour units have been developed over the years; for example core-loc, A...
report 2015
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Bonfantini, F. (author)
The Crablock is a symmetrical unit, this in contrast to the units that have been applied most in the past. Essentially, this is the main difference. All other units have six “obstacles” that insure interlocking, but they are not symmetrical. All those units are placed randomly in a certain way with more or less contacts to neighbouring units. A...
report 2014
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Van den Bos, J. (author), Verhagen, H.J. (author), Zijlema, M. (author), Mellink, B. (author)
A more detailed understanding of porous flow inside a rubble-mound structure may have potential benefits in breakwater design. Numerical models are expected to be a useful additional research tool in this field, provided that their calculation results can be validated against measurements. This paper presents the results of a systematic effort...
conference paper 2014
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Puente, I. (author), Lindenbergh, R.C. (author), González-Jorge, Higinio (author), Arias, P. (author)
Rubble mound breakwaters are coastal defense structures that protect harbors and beaches from the impacts of both littoral drift and storm waves. They occasionally break, leading to catastrophic damage to surrounding human populations and resulting in huge economic and environmental losses. Ensuring their stability is considered to be of...
journal article 2014
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Latham, John Paul (author), Xiang, Jiansheng (author), Anastasaki, Eleni (author), Guo, Liwei (author), Karantzoulis, Nikolaos (author), Viré, A.C. (author), Pain, Christopher (author)
Numerical modelling has the potential to probe the complexity of the interacting physics of rubble mound armour systems. Through forward modelling of armour unit packs, stochastic variables such as unit displacement and maximum contact force per unit during an external oscillatory disturbance can be predicted. The combined finite-discrete...
conference paper 2014
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Mulders, P.H.M. (author), Verhagen, H.J. (author)
A new series of physical model tests were conducted to analyse the behaviour of a breakwater core when it becomes exposed to wave attack. The emphasis of this research was on the measured influence of a wide stone grading on both the deformation of a breakwater trunk and the occurring longshore transport. This behaviour was investigated for both...
conference paper 2012
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Lioutas, A. (author), Smith, G.M. (author), Verhagen, H.J. (author)
The scope of this research is to find an empirical formula to describe the distribution of wave overtopping in the region behind the crest. A physical model was set up in which irregular waves were generated. In order to find a formula which adequately describes the test observations, the influence of several parameters has been analysed. The...
conference paper 2012
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Van de Koppel, M.A. (author), Muilwijk, M. (author), Verhagen, H.J. (author)
A physical model study on the row averaged static and dynamic load on the bottom row of single layer armour units in order to investigate the influence of various parameters such as the number of rows on the slope of a breakwater and the initial relative packing density.
conference paper 2012
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Villani, M. (author), Bosboom, J. (author), Zijlema, M. (author), Stive, M.J.F. (author)
Submerged shore-parallel breakwaters for coastal defence (henceforth SBWs) are a good compromise between the need to mitigate the effects of waves on the coast and the ambition to ensure the preservation of the landscape and water quality. However, if not properly designed, such structures can force circulation patterns that enhance shoreline...
conference paper 2012
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Kik, R. (author), Van den Bos, J.P. (author), Maertens, J. (author), Verhagen, H.J. (author), Van der Meer, J.W. (author)
Different layer design of a rock slope and under layers has a large effect on the strengths on the rock slope itself. In the stability formula developed of VAN DER MEER [1988] this effect is represented by the term Notional Permeability with symbol P. A more open, or permeable, structure underneath the armour layer has the ability to dissipate...
conference paper 2012
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Schoolderman, J. (author), Reedijk, B. (author), Vrijling, J.K. (author), Molenaar, W.F. (author), Ten Oever, E. (author), Zijlema, M. (author)
A new concept for wave energy conversion is examined as a proof of concept for generating electricity in a moderate wave climate while being integrated in a caisson breakwater. Physical model testing is performed to analyse the preliminary efficiency of the device and to identify areas of improvement. The resulting device is calculated for two...
conference paper 2011
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Verhagen, H.J. (author), Jumelet, D. (author), Vilaplana Domingo, A. (author), Van Broekhoven, P. (author)
In de Van der Meer formulas for armour stability the Notional Permeability is used as a parameter. Unfortunately the physical basis of this parameter is weak. It is therefore suggested to use a relation between the Notional Permeability P and the reduction of wave run-up due to infiltration into the breakwater. The advantage is that the latter...
conference paper 2011
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VanLishout, V. (author), Verhagen, H.J. (author), Troch, P. (author)
There is a growing interest in the application of submerged rubble mound breakwaters as coastal defence structures. As their defensive ability highly depends on the amount of wave energy remaining at their lee side, the accurate prediction of the energy in the lee of such structures is of utmost importance. Past experiments have shown that the...
conference paper 2011
Searched for: subject:"breakwater"
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