Searched for: subject:"armour%5C+units"
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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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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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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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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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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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De Rover, R. (author), Verhagen, H.J. (author), Van den Berge, A. (author), Reedijk, B. (author)
The effect of single layer interlocking armour unit breakage on the hydraulic armour layer stability and potential damage progression is addressed in this paper. A 2-dimensional scale model of a rubble mound breakwater with an armour layer consisting of Xbloc armour units was tested. The residual armour layer stability with broken units was...
conference paper 2008
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Kuiper, C. (author), Van Gent, M.R.A. (author)
De Bouwdienst van Rijkswaterstaat heeft WL Delft Hydraulics opdracht gegeven voor het uitvoeren van 2D fysisch modelonderzoek ten behoeve van een mogelijke renovatie van de havendammen van IJmuiden. Het betreft enerzijds modelonderzoek om meer inzicht te verkrijgen in mogelijk optredende schademechanismen bij de huidige constructie (Proevenserie...
report 2006
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Verhagen, H.J. (author), D' Angremond, K. (author), Van der Vliet, K. (author)
Recent research has shown that it is possible to use concrete cubes as a single armour layer on breakwaters. However, this is only possible in case a placing density of at least 70 % is achieved. In lab-tests it is no problem to place cubes with this density, however it is questionable if such a placing density can be achieved in prototype...
conference paper 2002
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Burcharth, H.F. (author)
The slender, complex types of armour units, such as Tetrapods and Dolosse are widely used for rubble mound breakwaters. Many of the recent failures of such structures were caused by unforeseen early breakage of the units, thus revealing an inbalance between the strength (structural integrity) of the units and the hydraulic stability (resistance...
report 1995
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Nooru-Mohamed, M.B. (author)
In this report, the results of a numerical parameter study on temperature stresses caused by hydration of cement in concrete breakwater elements are shown. Two different geometries were analysed namely hollow cubes and tetrapods. The problem encountered in solid cube breakwaters is the undesirable temperature build up between the core and the...
report 1994
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de Rouck, J. (author)
Onderzoek naar de stabiliteit van armour units op breuksteengolfbrekers en havendammen, met focus op betonnen elementen. Ontwikkeling van het HARO blok, toepassing van dit blok in de haven van Zeebrugge. Onderzoek naar de hydraulische en geotechnische faalmechanismen (glijvlakken), resultaten modelonderzoek en prototype metingen in Zeebrugge van...
report 1991
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De Haan, W. (author)
The computation of the optimum rubble-mound breakwater crosssection is executed on a micro-computer. The RUMBA computer package consists of two main parts: the optimization process is executed by a Turbo Pascal programme, the second part consists of editing functions written in AutoLISP. AutoLISP is the programming language within AutoCAD. The...
report 1989
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Van der Meer, J.W. (author)
Delft Hydraulics has performed an extensive investigation on the stability of rubble mound revetments and breakwaters under random wave attack. Two stability formulae have been derived which describe the stability of rock slopes as a function of wave height, wave period, slope angle, storm duration, permeability and damage level. The complete...
report 1987
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Massie, W.W. (author)
General considerations, types of breakwaters, rubble mound breakwaters, wave run-up and overtopping, construction materials, armor computations, te core, filter and toe constructions, rubble mound breakwater construction, optimum design, example, monolithic breakwater, construction materials, wave foreces on vertical walls, monolithic breakwater...
lecture notes 1986
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Juul Jensen, O. (author)
Overview of failure mechanisms of rubble mound breakwaters of various types.
report 1984
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Anonymous, A. (author)
Droptests executed for the port of Bizerta in Tunesia on concrete armour units.
report 1984
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Price, W.A. (author)
It is not possible to design rubble mound structures employing complex blocks entirely from first principles. Each type of armour unit exploits properties like weight, interlocking, inter-block friction etc, in varying degrees to achieve stability. This is one of the reasons that the empirical formulae often used are inadequate and why most...
report 1979
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Hudson, R.Y. (author)
This paper reports on a laboratory investigation conducted at the United States Army Engineer Waterways experiment station, Vickburg, Mississippi, to determine criteria for the design and construction of rubble mound breakwaters. Small-scale breakwater sections are hand-constructed in a concrete wave flume 119 ft long, 5ft wide, 4 ft deep, and...
report 1959
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Iribarren Cavanilles, R. (author)
Development of a formula for the stability of rubble mound breakwaters.
report 1953
Searched for: subject:"armour%5C+units"
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