EP0815327B1 - Dispositif attenuateur de houle - Google Patents

Dispositif attenuateur de houle Download PDF

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Publication number
EP0815327B1
EP0815327B1 EP96909188A EP96909188A EP0815327B1 EP 0815327 B1 EP0815327 B1 EP 0815327B1 EP 96909188 A EP96909188 A EP 96909188A EP 96909188 A EP96909188 A EP 96909188A EP 0815327 B1 EP0815327 B1 EP 0815327B1
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EP
European Patent Office
Prior art keywords
swell
incident
fact
plate
attenuating device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96909188A
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German (de)
English (en)
French (fr)
Other versions
EP0815327A1 (fr
Inventor
Alex Degaie
Jean Bougis
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Individual
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Individual
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Publication date
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Publication of EP0815327A1 publication Critical patent/EP0815327A1/fr
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/06—Moles; Piers; Quays; Quay walls; Groynes; Breakwaters ; Wave dissipating walls; Quay equipment
    • E02B3/062—Constructions floating in operational condition, e.g. breakwaters or wave dissipating walls

Definitions

  • the present invention relates to a device for attenuating swell.
  • Attenuating device which is the subject of the present invention, for example, to preserve offshore installations or shipyards.
  • the former have the disadvantage, in particular, of being heavy to implement and high cost. In addition, they strongly disturb the marine fauna and flora. The second are difficult to use for long wavelength swells.
  • Such devices must therefore have large dimensions to have a significant effect on very long swells wave.
  • they are generally attached to the bottom. Also, they present the disadvantage of being difficult to implement and of high cost.
  • a wave attenuating device comprising beating means floating in area. They are designed to recover the energy of an incident swell and to generate, downstream of the device, a forced swell in phase shift by compared to said incident swell. For this, they use the roll component swell and are free to rotate around an axis perpendicular to the direction of the incident swell.
  • the forced swell generated makes it possible to compensate, at least by part, the incident swell and therefore reduces its downstream effects.
  • the object of the present invention is to overcome the drawbacks aforementioned by proposing a wave attenuating device which has a low congestion, in particular, in the direction of propagation of the swell, and whose control of operation is controlled.
  • Another object of the present invention is to provide a effective wave attenuator for both short wavelengths and for adults.
  • Another object of the present invention is to provide a wave attenuating device which lets the sea currents through and thus allows the ecological and sedimentological balances to be respected, the evacuation of pollutants discharged into the protected body of water and the integrity of the marine environment.
  • An advantage of the present invention is that it allows, in tides, to follow their level.
  • An advantage of the present invention is that it allows, in tides, to follow their level.
  • An advantage of the present invention is that it has a low draft, which allows to respect the aesthetics of the site.
  • Another object of the present invention is to provide a wave attenuating device which has a low construction cost as well than a simplified installation and maintenance.
  • Another object of the present invention is to provide a wave attenuator which can be removed at low cost and without damage to the site and its environment.
  • Figure 1 describes, schematically, the principle of a Wave attenuating device according to the invention.
  • Figure 2 shows, in a transverse view, an example of Wave attenuating device according to the invention.
  • Figure 3 is a front view of the attenuator device swell, shown in Figure 2.
  • Figure 4 is a top view, in section along the line IV-IV represented in FIG. 3, of the swell attenuating device illustrated in FIG. 2 previous.
  • Figure 5 is a top view showing an example of use of the swell attenuator device according to the invention.
  • the present invention relates to a device for attenuating swell. In general, it will find its application in particular in the control or use of watercourses, rivers, coasts or others maritime locations.
  • the swell In a body of water, the swell generally propagates according to a given direction defined, in particular, by the prevailing offshore winds, the waveguides formed by possible dikes, the trajectory of large vessels whose wake generates swell, or other. It is, in fact, a mean direction, the different incident swells having a direction distributed, substantially along a Gaussian pattern, for example, at more or minus 45 ° around this fictitious general direction.
  • incident wave 1 As shown in Figure 1, it appears theoretically possible to envisage a device which makes it possible to completely attenuate a swell, called incident wave 1, having an average direction of propagation 2 given, as defined above.
  • the example of devices wave attenuators is based on this principle. So, he includes beating means 8 semi-submersible, able to recover the energy of the incident swell 1 which one wishes to attenuate and to generate, in downstream of the device a forced swell in phase offset with respect to said incident swell 1.
  • beater means 8 a swell is therefore generated, the effects, according to the principle explained above, will compensate for those of the swell incident. Approaching the phase opposition, we will then tend towards obtaining a flat calm.
  • a device has the advantage of being autonomous. Indeed, it is the own beaters 8 which, by recovering the energy of the incident swell 1, ensuring, by oscillating vertically, the forced swell production.
  • downstream and upstream are defined according to the direction propagation of the incident swell 1, this going, according to the arrow marked 2, from upstream to downstream.
  • semi-submersible means that the means beaters are provided floating near the surface of the water, as the shown in Figure 2, and are not fixedly retained by the bottom.
  • the wave attenuator device conforming to the invention comprises means 9 for holding said beating means 8 in place relative to the mean direction of wave propagation incident 1, leaving the device free in its vertical movements.
  • said means 9 for maintaining allow to retain the attenuator, in particular, in its horizontal translations and in its rotations around a vertical axis. They are also able to prevent rotations of said attenuator about a horizontal axis, that is to say, its possible roll movements. In other words, according to the present invention, only vertical translations of the attenuator are allowed.
  • the radiation damping should be as large as possible since it accounts for the energy of the swell generated and the stiffness of the device in front, as will be developed later, remained limited, it therefore appears necessary for the device to oscillate vertically that the sum M + M a is high.
  • the beater means 8 include in particular a heavy plate.
  • the latter is oriented, for example transversely relative to the mean direction of propagation of the incident swell 1.
  • ballasts 11 these can be more or less filled in order to adapt the mass of the device. They can also be used, if necessary, to adjust its draft of water depending on the amplitude and / or direction of the swell, or others. However, care must be taken to avoid the risks of liquid fairings.
  • ballasts 11 Another advantage of ballasts 11 is that they allow the device to be brought to the place where it is to be used by doing so float steadily.
  • the heavy plate 10 is, in particular, of rectangular shape. According to other embodiments, it can be also, for example, square, oval or round.
  • the heavy plate 10 is arranged substantially horizontally, its largest dimension being perpendicular to the direction of propagation of the swell.
  • the plate 10 is also oriented so that one of its edges are attacked by the incident swell at an average angle of 90 °.
  • the device also comprises, for example, means 12 for increasing the mass of added water M a .
  • means 12 for increasing the mass of added water M a are in particular transverse skirts 13, provided under the plate 10, in the vicinity of its long sides and / or, possibly, of its short sides.
  • skirts 13 therefore define a volume of liquid 14 which, being confined under the swell attenuator, increases the forces by phase with acceleration and therefore the mass of water added.
  • Skirts 13 also have, in particular, the advantage to reduce swells of short wavelengths.
  • the incident swells that we want to reduce generally have, as for the direction, a wavelength 3 average.
  • a proper oscillation period as close as possible to said mean incident swell period 1.
  • care must be taken to that the natural period of the device remains slightly greater than said average period in order to prevent the swell generated 4 from undergoing an inversion and finds itself in phase with the transmitted incident swell.
  • the device comprises, for example, means to adapt its own period of oscillation, in particular, according to the mean incident swell period 1.
  • They consist, in particular, of the heavy plate 10 planned submerged, so as to limit the hydrostatic stiffness of the device by reducing its surface in the vicinity of the water / air interface.
  • H that is to say the stiffness of the system. This decreases with the surface of the device at the water / air interface, the heavy plate 10 is submerged.
  • the stiffness of the device also must not be too weak if it is to be able to be brought into oscillation.
  • the device also comprises, for example, a veil 16 transverse, in particular vertical, semi-submerged, above the plate 10.
  • the veil 16 can be provided substantially at middle of said plate 10. It defines, on the side of incident swell 1, a so-called upstream chamber 17 and, on the other side, a so-called chamber downstream 18.
  • the web 16 can be provided either further back or further forward so as to modulate the surface respective upstream 17 and downstream 18 chambers.
  • the veil 16 has the advantages of also contributing, in particular, to stop small swells. In addition, it allows to break Velocity and pressure fields of the incident swell 1. We can notice that the skirts 13 and the veil 16 also make it possible to contribute to attenuation of swell by viscous dissipation.
  • downstream chamber 18 constitutes a buffer tank. Indeed, the water it stores allows digging the ridges and fill the troughs downstream.
  • the substantially vertical veil 16 may have, in particular oblique sails 19 in the vicinity of its edges.
  • the device further comprises, for example, semi-submerged sidewalls 20, perpendicular to the transverse web 16, in the vicinity of the transverse edges from plate 10.
  • the vertical edges of the flanks 20 in particular have chamfers 21. They participate, like oblique sails 19, by smoothing the lines current, to the hydrodynamic efficiency of the device.
  • the device has a semi-submersible oscillating structure. According to the laws of hydrodynamics, there is therefore a period for which the excitation transmitted by the incident swell 1 is minimal. It is the extinction period T e defined by the vertical dimensions of the device and the ratio of the immersed surfaces.
  • a weak extinction period is chosen so that it is closest possible periods for which the attenuator operates by reflection and / or dissipation, namely short wavelengths.
  • the device therefore also includes, for example, means to reduce its extinction period, in particular by control of the relationship between the surface of the device at the liquid / air interface and the plate surface 10.
  • the ratio between the waterline represented in hatched lines and the surface horizontal of the plate 10 is of the order of 26%.
  • the means 9 for keep the device in place are constituted, for example, by piles 23, not shown in Figures 2 and 3, on which the device is mounted sliding, substantially vertically.
  • the piles 23 are in particular, vertical, and lead to through the plate 10. They are, for example, secured to the bottom. As security, flexible anchoring can also be provided.
  • the device comprises, above of the web 16, a substantially horizontal panel 24. It makes it possible to constitute a pontoon. However, its dimensions must be adapted to the requirements of static stability and oscillation of the device.
  • Panel 24 has the advantage of limiting the effects of sprays of water generated by the chop upstream.
  • the attenuators are assembled, in particular, two to two, side by side and slide vertically, in particular, along piles 23 substantially parallel.
  • the overall direction of the attenuators is, in particular, perpendicular to the mean direction 2 of the incident swell 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Revetment (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Surgical Instruments (AREA)
EP96909188A 1995-03-17 1996-03-18 Dispositif attenuateur de houle Expired - Lifetime EP0815327B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9503377A FR2731724B1 (fr) 1995-03-17 1995-03-17 Dispositif attenuateur de houle
FR9503377 1995-03-17
PCT/FR1996/000408 WO1996029475A1 (fr) 1995-03-17 1996-03-18 Dispositif attenuateur de houle

Publications (2)

Publication Number Publication Date
EP0815327A1 EP0815327A1 (fr) 1998-01-07
EP0815327B1 true EP0815327B1 (fr) 2001-08-29

Family

ID=9477321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96909188A Expired - Lifetime EP0815327B1 (fr) 1995-03-17 1996-03-18 Dispositif attenuateur de houle

Country Status (7)

Country Link
EP (1) EP0815327B1 (es)
AU (1) AU709929B2 (es)
DE (1) DE69614839D1 (es)
ES (1) ES2163619T3 (es)
FR (1) FR2731724B1 (es)
TR (1) TR199700970T1 (es)
WO (1) WO1996029475A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1003786B (el) * 2000-12-28 2002-01-30 Θαλασσια Μηχανικη Αε Πλωτοι κυματοαπορροφητηρες κατακορυφης αγκυροβολιας.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1417153A (fr) * 1964-07-24 1965-11-12 Transp Et De La Valorisation D Dispositif d'atténuation de la houle et de ses effets
US3487645A (en) * 1968-08-21 1970-01-06 Litton Systems Inc Wave damping device
DE1784588A1 (de) * 1968-08-22 1971-10-07 Grenobloise Etude Appl Schwimmender Wellenbrecher
FR2532345A1 (fr) * 1982-09-01 1984-03-02 Rech Etu Oceanographiques Barrage anti-houle flottant
FR2576337B1 (fr) * 1985-01-24 1987-02-27 Principia Rech Dev Attenuateur de houle

Also Published As

Publication number Publication date
ES2163619T3 (es) 2002-02-01
WO1996029475A1 (fr) 1996-09-26
FR2731724B1 (fr) 1997-06-06
AU709929B2 (en) 1999-09-09
DE69614839D1 (de) 2001-10-04
TR199700970T1 (xx) 1998-02-21
EP0815327A1 (fr) 1998-01-07
AU5277896A (en) 1996-10-08
FR2731724A1 (fr) 1996-09-20

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