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Salauddin, M (author), Broere, A. (author), van der Meer, J.W. (author), Verhagen, H.J. (author), Bijl, E (author)Single layer concrete armor systems are being widely used nowadays in the design of rubble mound breakwaters. Recently, a new concrete armor unit has been developed and applied as single layer armor system in the repair works of one damaged breakwater at Al Fujeirah, UAE. It has a symmetrical shape, in contrast to most other units. Modern...journal article 2017
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Verhagen, H.J. (author), van den Bos, J.P. (author)For this book we have deliberately chosen that the text should follow a more or less logical design procedure for breakwaters. It follows the required design steps from the system level down to the individual crosssection level, and in time from conceptual design to construction. This systematic approach starts at the functional description of...lecture notes 2017
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Guillaume Carpentier, G. (author), Piero Silva, P. (author), Allsop, W (author), Mouazé, D. (author), Verhagen, H.J. (author), Gautier-Chevreux, L. (author), Bagieu, M. (author)This paper describes a unique design project devised to teach and apply technical skills in port design, but also in the practical cooperation between students in a realistic design project. The 4-week long project now involves students of up to 19 nationalities from 7-10 universities, and has been based each year on real design projects....conference paper 2017
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Salauddin, M. (author), Broere, A. (author), Van der Meer, J.W. (author), Verhagen, H.J. (author), Bijl, E. (author)A new and symmetrical single layer armour unit, the crablock, has been designed in the UAE. One breakwater was reconstructed with crablock, but very limited testing had been performed. Just to become more acquainted with this new unit, pre-competitive research at a university has been performed, which is the subject of this paper. Being a new...conference paper 2015
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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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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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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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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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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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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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Tsimopoulou, V. (author), Kanning, W. (author), Voortman, H.G. (author), Verhagen, H.J. (author)One of the failure mechanisms of a rubble mound breakwater is the failure of its armour layer. In order to determine the stability of an armour layer, the design load has to be defined, which is in fact the wave that attacks the structure. Being a highly stochastic phenomenon, the wave action is not easily defined, while there is always some...conference paper 2011
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Tsimopoulou, V. (author), Kanning, W. (author), Verhagen, H.J. (author), Vrijling, J.K. (author)This paper presents the development of a semi-probabilistic method for armour layer design of rubble mound breakwaters, which is based on the use of safety factors. The objective is to introduce an approach that is both attractive to designers and sufficiently reliable when a high degree of uncertainty is involved in the design process. The main...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
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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 2010
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Baart, S. (author), Ebbens, R. (author), Nammuni-Krohn, J. (author), Verhagen, H.J. (author)Present design tools, as found in the Rock Manual or Coastal Engineering Manual, for the determination of toe rock size for rubble mound breakwaters are based on test data with a large spread: data is relatively dispersed around the centre and descriptive equations have limited applicability ranges. New research has been undertaken to contribute...conference paper 2010
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Nguyen, D.V. (author), Van Gelder, P.H.A.J.M. (author), Verhagen, H.J. (author), Vrijling, J.K. (author)In order to avoid failure in its lifetime, a breakwater system has to be inspected and, if necessary, has to be repaired. In this paper, a comprehensive maintenance strategy with optimal inspection planning is formulated. Rational maintenance decision-making approaches are discussed. The proposed maintenance strategy combines time-dependent and...conference paper 2010
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Verhagen, H.J. (author)In the ROCK MANUAL (2007) some guidance is given for the design of toes for breakwaters. However, for very shallow toes, as well as for very wide toes (or berms) this guidance is only marginally. Recently a number of shallow berms and toes have been constructed, partly with the intention to lower the height of the breakwater. These works showed...conference paper 2010
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Nguyen, D.V. (author), Van Gelder, P.H.A.J.M. (author), Verhagen, H.J. (author), Vrijling, J.K. (author)This paper presents a comprehensive maintenance strategy with optimal inspection planning and its application to rubble mound breakwaters. In order to fulfil designated functions, a breakwater has to be inspected during its lifetime and has to be repaired if necessary. Actions of inspecting and repairing form a maintenance strategy. In the paper...conference paper 2010