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Juhl, J. (author), Archetti, R. (author)
Local scour can occur at a breakwater constructed on a sandy seabed and may endanger the overall stability due to sliding of the main armour layer if the toe and scour protection is failing. The scouring pattern is a function of the water depth, wave conditions, sediment characteristics, and breakwater configuration and reflection...
report 1997
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Van Gent, M.R.A. (author)
Wave interaction with dynamically stable structures is simulated by means of a numerical model based on fmite-amplitude shallow-water wave equations. The model can simulate wave motion on and inside permeable structures. For dynamically stable structures, including berm breakwaters, reef-type structures and gravel beaches, a procedure is...
report 1997
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Juhl, J. (author), Burcharth, H.F. (author), D' Angremond, K. (author), Sigurdarson, S. (author), Holmes, P. (author), Torum, A. (author), Lamberit, A. (author)
A research project on berm breakwater structures was carried out with the overall objective of arriving at a better design basis. Eight European organisations from Denmark, The Netherlands, United Kingdom, Norway, Italy and Iceland participated in the joint research project co-sponsored by the European Commission under the second research and...
report 1997
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Van Gent, M.R.A. (author)
Wave interaction with berm breakwaters is studied by means of a physical model and a numerical model. The physical-model tests have been used to verify the wave motion as calculated by the numerical model. The numerical model based on finite-amplitude shallow-water wave equations is capable of simulating the wave motion both on and inside the...
report 1997
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Juhl, J. (author)
The influence of permeability and stone gradation on the reshaping and wave overtopping of berm breakwaters was studied by flume model tests. Another aspect studied was the difference in reshaping comparing a berm breakwater constructed of two stone classes and a more stable Icelandic type of berm breakwater with the largest berm stones used as...
report 1997
document
Alikhani, A. (author), Tomasicchio, G.R. (author), Juhl, J. (author)
Comprehensive three-dimensional model tests with a berm breakwater roundhead and the adjacent trunk section were carried out at the Danish Hydraulic Institute (DHI) and at the Hydraulic & Coastal Engineering Laboratory of Aalborg University (AAU). This paper describes the influence of wave obliquity on the profile shape, on the initiation of...
report 1997
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Juhl, J. (author)
Note on the roundhead stability of berm breakwaters. Recession, erosion and longshore transport are measured
report 1996
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Archetti, R. (author), Lamberti, A. (author), Westeren, K. (author), Torum, A. (author)
In order to develop a model able to describe how berm breakwaters reshape under the attack of waves, a large quantity of data from 2D and 3D tests was collected and arranged in a database. The data were first standardised, and since data come from models with very different size, all the lengths were scaled with the nominal diameter (Dn50) of...
report 1996
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Alikhani, A. (author), Frigaard, P. (author), Hald, T. (author)
In order to describe the reshaping breakwater profile, the profile has to be schematized into profile parameters. Static stability is describe by damage and reshaping breakwaters by the profile. The profile can be schematized by profile parameters such as height and length parameters. Burcharth, and Frigaard (1988) made the first systematic...
report 1996
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Juhl, J. (author)
Programme of the 3rd workshop on berm breakwaters.
report 1996
document
Jensen, M.S. (author), Frigaard, P. (author)
The report summaries the results obtained with a berm breakwater attacked by oblique waves. In the tests special attention is given to the influence of the rock shape on the longshore transport. Moreover, the reshaping berm profile and amount of wave overtopping is examined. The tests were performed in a tree-dimensional model in Jan.-Feb. 96'...
report 1996
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Archetti, R. (author), Lamberti, A. (author)
Berm or reshaping breakwaters represent a relatively new -type of wave barrier; more precisely the conscious acceptation of stone movement during reshaping and of the eventual dynamic equilibrium of the units in the exposed mound is new. Stones of the armour layer are accepted to move under the wave attack until a new equilibrium of the seaward...
report 1996
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Sloth, P. (author)
Figures with results from the tests; no text is attached.
report 1996
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Juhl, J. (author), Alikhani, A. (author), Sloth, P. (author), Archetti, R. (author)
For berm breakwaters as compared with traditional rubble mound breakwaters, special measures have to be taken for the breakwater roundhead. If stone displacements occur on a roundhead, the stones will be moved in the wave direction and will loose most of their stabilising effect. The major part of the research on berm breakwaters has...
report 1996
document
Juhl, J. (author)
The overall objective of the research project on berm breakwater structures is to arrive at a better design basis, which will bring the design standards of berm breakwaters up to the level of design standards for other civil engineering structures. This objective will be reached by establishing an understanding of the physics of berm breakwaters...
report 1996
document
Juhl, J. (author), Jensen, M.S. (author)
The influence of permeability and stone gradation on the reshaping and wave overtopping of berm breakwaters was studied as part of this research. Another aspect studied was the difference in reshaping comparing a berm breakwater constructed of two stone classes and a more stable Icelandic type of berm breakwater built of three stone classes with...
report 1996
document
Juhl, J. (author)
Summary of test results.
report 1996
document
Alikhani, A. (author), Tomasicchio, R.G. (author), Juhl, J. (author)
The major part of the research on berm breakwaters has concentrated on the berm reshaping of a trunk section exposed to head-on waves. Recent research included aspects related to individual stone movements under perpendicular wave attack (eg Tomasicchio et al). For a berm breakwater trunk section consisting of berm stones smaller than a certain...
report 1996
document
Juhl, J. (author)
Discussions
report 1995
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Hald, T. (author), Burcharth, H.F. (author), Frigaard, P. (author)
As a part of the MAST II Berm Breakwater Structures, existing data from conducted laboratory tests have been reanalised. The objective was to evaluate the effect of the longshore transpsort on both the roundhead and trunk, the ht.u,er exposed to both head-on waves and oblique inegular waves varying from 15 to 30 degrees angle of incidence. 3...
report 1995
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