Searched for: subject%3A%22armour%255C%2Bstability%22
(1 - 20 of 20)
document
Jumelet, Daan (author), van Gent, M.R.A. (author), Hofland, Bas (author), Kuiper, C. (author)
Physical model tests have been performed to study static stability of rock-armoured mild slopes. Current stability design formulae for steeper rock-armoured slopes focus on plunging and surging waves. Slopes of 1:6 and milder usually have more spilling breakers which decreases the load. Also, on mild slopes displaced rocks more often remain...
journal article 2024
document
Etemad-Shahidi, Amir (author), van Gent, M.R.A. (author)
Conventional rubble mound structures such as breakwaters, seawalls, and revetments are the most common type of coastal structures around the world used to protect harbour basins and embankments from wave action. To have a safe and economic design, two aspects need to be considered. The first one is the structural stability where the required...
conference paper 2023
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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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Bux, I. (author)
Experience has shown that the stability parameters relating to breakwater armour unit stability vary considerably for steep foreshores when compared to milder foreshore slope. Furthermore, the change from the deep water spectra (Tm0) to the shallow water wave spectra (Tm-1.0) does not fully explain the difference. Leading on from recent...
report 2007
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Muttray, M. (author)
Overview of computational rules for Accropede and Xbloc in Cress
report 2006
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Verhagen, H.J. (author), Reedijk, B. (author), Muttray, M. (author)
Experience has shown that stability parameters for breakwater armour are different for steep and shallow foreshores, as well as for deep and shallow water. A change from a deep water spectral information (Tm0) to shallow water spectral information (Tm-1,0) does not completely explains this difference. Tests have shown that stability also depends...
conference paper 2006
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Verhagen, H.J. (author)
In case of coasts with steep foreshores coastal structures suffer more from damage than normally could be expected from given boundary conditions at deep water. For that reason in many guidelines it is recommended to apply a heavier class of rock in those cases; manufacturers of single layer units (like Accropode, Core-loc or Xbloc) recommend a...
conference paper 2005
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Van der Meer, J.W. (author)
Bij WL is onderzoek uitgevoerd naar stabiliteit van breukstenen taluds bij (zeer) ondiepe voorlanden. De paper voor Coastal Structures 2003 "Stability of rock slopes with shallow foreshores" door van Gent, Smale en Kuiper is een samenvatting van het werk. Hierin wordt voorgesteld een andere periodemaat te nemen dan in de van der Meer formule en...
report 2004
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De Jong, W. (author), Verhagen, H.J. (author), Olthof, J. (author)
Physical model tests were done on an armour of Tetrapods, placed in a single layer. The objective of the investigations was to study the stability of the secondary layer, and to see if the material of this secondary layer could be washed out through the single layer of Tetrapods. It was concluded that secondary armour is not washed out through...
conference paper 2004
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Anonymus, A. (author)
The coastal team of Delta Marine Consultants [DMC] have taken the initiative to develop a new concrete armour unit for application on breakwaters and shore protections. Following the preliminary model tests conducted at DMC, 2-D hydraulic model tests have been carried out at Delft Hydraulics in October 2002. The experimental set-up and test...
report 2003
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Verhagen, H.J. (author)
In a classical design approach to breakwaters a design wave height is determined, and filled in into a design formula. Some undefined safety is added. In the method using partial safety coefficients (as developed by PIANC [1992] and recently also adopted by the Coastal Engineering Manual of the US Army Corps of Engineers [CEM [2003]) the degree...
conference paper 2003
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Van den Bosch, A. (author), D' Angremond, K. (author), Verhagen, H.J. (author), Olthof, J. (author)
Studies on the stability of the amour layer (d’Angremond et. al. [1999] revealed the importance of density of placement. The current research focuses on the influence of the density of placement on the stability of cubes in a double armour layer and tetrapods and rocks in a single armour layer. The experiments were performed in the Laboratory of...
conference paper 2002
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Turk, G.F. (author), Melby, J.A. (author)
The Core-Loc, invented and developed at the Waterways Experiment Station (WES), is a new-generation, optimized breakwater concrete armor unit for protecting shoreline and navigation structures.Because of the very difficult construction, in-service, and repair conditions associated with high-energy wave environments, a need was identified to...
report 1997
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Koster, M.J. (author)
Overview of application of the Van der Meer formula in a probabilistic environment.
report 1990
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Latham, J.P. (author), Mannion, M.B. (author), Poole, A.B. (author), Bradbury, A.P. (author), Allsop, N.W.H. (author)
This is the second of two reports relating to a collaborative prograrmne of random wave flume tests to quantify the effect of rock shape on stability. The first report, SR 150, by Hydraulics Research, Wallingford, gives a summary of recent advances in design methods for rock armoured coastal structures and presents a detailed description of the...
report 1988
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Markle, D.G. (author)
This memorandum provides design guidance for sizing toe berm armor on breakwater and jetty trunks exposed to depth limited breaking waves whose crests approach at or near parallel to the structure
report 1987
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Bruun, P. (author), Günbak, A.R. (author)
Existing design formulas for rubble-mound breakwaters under wave attack contain the wave height, H, and the slope angle, cc, as parameters of the wave characteristics (for d/H > 3.0, d being the water depth in front or the structure) and structure characteristics (incl. permeability, roughness, interlocking-, etc.) excluding the effect of wave...
report 1977
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Thompson, D.M. (author), Shuttler, R.M. (author)
In 1962 the Civil Engineering Research Association (CERA) sponsored laboratory tests which resulted in the publication of a report (1) giving design procedures for determining the riprap size required for given design wave conditions. the CERA work represents one of the first attempts to rel.te the results of tests using regular waves to those...
report 1975
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Bruun, P. (author), Johannesson, P. (author)
Forces by uprush and downrush, the imporatnace of permeability, the resonance phenomenon, friction between armor blocks and between armor and sublayer, slope geotmetry and practical design principles
report 1974
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Hudson, R.Y. (author)
Paper describing the development of the "Hudson formula" for the stability of armor on a breakwater.
report 1959
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