EP3829728A1

EP3829728A1 - Dynamic artificial wave facility for surfing practice

Info

Publication number: EP3829728A1
Application number: EP19759659.6A
Authority: EP
Inventors: Laurent HEQUILY
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-30
Filing date: 2019-07-29
Publication date: 2021-06-09
Also published as: CA3107865A1; WO2020025887A1; FR3084266A1; FR3084266B1; US20210324647A1; US11236521B2

Abstract

The facility comprises an artificial wave generator (12) having an element for driving moving water along a predetermined path (21), comprising a first body (60) profiled as a hydrofoil, orientated upright, having a leading edge (62) towards the front, a trailing edge (63) towards the rear, first and second main faces (64, 65) extending respectively on a first side and a second side, between the leading and trailing edges, and being configured with respect to said path so that when the generator is in service, a lift force directed towards a wave development zone is applied on the first body; and a second body (61) profiled as a hydrofoil, orientated horizontally, having a leading edge (68) towards the front, a trailing edge (69) towards the rear, first and second main faces extending respectively on a first side and a second side, between the leading and trailing edges, facing downwards, and being configured with respect to said path so that when the generator is in service, a lift force directed upwards is applied on the second body.

Description

Installation of dynamic artificial waves for surfing

FIELD OF THE INVENTION

The invention relates to dynamic artificial wave installations for surfing.

TECHNOLOGICAL BACKGROUND

We know that dynamic artificial waves reproduce natural waves which propagate and should not be confused with static artificial waves which are formed by a layer of water of uniform thickness, for example of the order of 10 cm, projected on an inclined wall.

In this document, it is understood that references to artificial waves should be understood to refer to dynamic artificial waves and not static artificial waves.

French patent application 3,039,421, to which international application WO 2017/017319 corresponds, already knows an installation with artificial waves for the practice of surfing, comprising:

a support having an upper surface comprising an edge zone, a wave evolution zone and a culminating zone, the wave evolution zone extending, in an upward slope, from the edge zone to the zone culminating;

- water located above said edge zone and said wave evolution zone; and

- an artificial wave generator comprising at least one mobile water entrainment element above the edge area along a predetermined path, said wave generator and said upper surface of the support being configured so that when the wave generator is in service, the mobile element is followed laterally by a wave moving in the water towards the wave evolution zone in contact with which the generated wave breaks towards the culminating zone.

Examples of embodiment of this installation are described below in support of FIGS. 1 to 6 of the appended drawings, in which: Figure 1 is a top view of a first embodiment of this installation, the generator of artificial waves is at rest;

Figures 2 and 3 are the sectional views identified by ll-ll and lll-lll in Figure 1;

Figure 4 is a view similar to Figure 1 but with the artificial wave generator in service;

Figure 5 is the sectional view identified by V-V in Figure 4; and Figure 6 is a view similar to Figure 2 for a second embodiment of this installation.

The installation 10 illustrated in FIGS. 1 to 5 comprises a floating platform 1 1 here with a circular external contour and a generator of artificial waves 12 installed on the platform 1 1.

The platform 1 1 has an upper surface 14 comprising an edge zone 15, a wave evolution zone 16 and a culminating zone 17.

The generator 12 of artificial waves comprises four water drive elements 20, each movable along a predetermined path 21, which is here circular.

Each movable element 20 moves above the edge zone 15.

Facility 10 is located in a calm body of water, with little or no disturbance such as natural waves. The shore of the body of water is at a distance from installation 10, which therefore forms an island.

When the wave generator 12 is at rest, that is to say when the mobile elements 20 are fixed, the culminating zone 17 is emerged.

In FIGS. 1 and 4, the limit between the emerged and submerged zones when the wave generator is at rest, is represented by a line 18 in phantom.

When the wave generator 12 is in service, each movable element 20 is followed laterally, as can be seen in FIG. 4, by a wave 22 moving towards the wave evolution zone 16, in contact with which the wave 22 generated breaks towards the culminating zone 17. The platform 1 1 has for example a diameter of 60 to 80 m or even more and the waves 22 a height of the order of 2 m for the practice of traditional surfing (surfer standing on a board); while for the practice of surfing lying on an appropriate board (bodyboard) the installation has for example a diameter of 18 to 22 m or even more and the waves 22 have a height of the order of 50 to 60 cm.

Here, the body of water is formed by a sheltered cove or sea bay.

Alternatively, the cove or sea bay is replaced by another body of water in a natural environment, for example a lake or a river if there is not too much current, or in an artificial environment, for example a basin in masonry.

The aquatic environment 23 (here, the sea) with which the platform 1 1 and the wave generator 12 cooperate has a region 24, called the internal aquatic region, located above the edge zone 15 and the evolution zone waves 16.

In addition to the internal aquatic region 24, the aquatic medium 23 comprises, outside the platform 1 1 along the edge area 15, a region 25, called the upper external aquatic region, located higher than the area of edge 15 and a region 26, called the deep external aquatic region, located lower than the edge region 15.

The aquatic medium 23 finally comprises, below the platform 1 1, a region 27, called the underlying aquatic region.

The deep external aquatic region 26 and the upper external aquatic region 25 are horizontally contiguous.

The internal aquatic region 24 and the upper external aquatic region 25 are vertically contiguous.

Likewise, the underlying aquatic region 27 and the deep external aquatic region 26 are vertically contiguous.

It is understood that the subdivision of the aquatic environment 23 into aquatic regions 24 to 27 is solely based on the location of the regions in question in relation to platform 11, that is to say that regions 24 to 27 designate places where there is water and not isolated volumes of water.

It will be noted in this regard that there are no liquid tight walls isolating the different aquatic regions 24 to 27 from each other.

On the contrary, the water in the aquatic environment 23 (here, sea water) circulates between the different aquatic regions 24 to 27.

Thus, when the wave generator 12 is at rest, the entire aquatic medium 23 has the same surface level.

In particular, as can be seen in FIGS. 1 to 3, the level of the surface of the internal aquatic region 24 is identical to the level of the surface of the upper external aquatic region 25.

To protect surfers from possible marine predators, a grid or a net 28 (shown diagrammatically in FIGS. 2, 3 and 5 only) can be provided between the internal aquatic region 24 and the upper external aquatic region 25. Similarly , a grid or a net (not shown) may be provided around the path 21 to avoid any contact between the mobile elements 20 and the surfers.

The upper surface 14 of the platform 11 comprises, in addition to the edge zone 15, the wave evolution zone 16 and the culminating zone 17, a crest 30 and a zone 31 in depression relative to the crest 30 .

The crest 30 is located between the culminating zone 17 and the depression zone 31. More precisely, the crest 30 is situated between the summit of the culminating zone 17 and the summit of the depression zone 31.

As can be clearly seen in FIGS. 4 and 5, the culminating zone 17 and the depression zone 31 are configured so that when the wave generator 12 is in service, the water at the end of the course of the waves 22 crosses the ridge 30 and falls into a volume 32 delimited by the depressed area 31, this volume being called collection volume.

Openings 33 or 39 formed through the platform 11 open respectively into the collection volume 32 and into the underlying aquatic region 27. The underlying aquatic region 27 provides a fluid communication connecting the deep external aquatic region 26 to the openings 33 or 39, and therefore to the collection volume 32.

As a result, as can be seen in FIGS. 2 and 3, the level of the surface of the collection volume 32 remains the same as for the entire aquatic environment 23 when the wave generator 12 is at rest or, as can be seen in FIG. 5, the same as for the aquatic medium 23 outside the internal aquatic region 24 when the wave generator 12 is in service.

Thus, when the wave generator 12 is in service, the water at the end of the wave path 22 leaves the internal aquatic region 24, falling into the collection volume 32 from which it is discharged without passing through the internal aquatic region 24 since the fluid communication is located under the platform 1 1.

The upper external aquatic region 25 is also not disturbed, or very little, since it is the deep external aquatic region 26 which is in communication with the collection volume 32.

The internal aquatic region 24, and moreover the upper external aquatic region 25, thus not being disturbed by the surf, or at the very least very little disturbed, it is possible to have a very short delay between two waves 22 successive.

In addition, the platform 1 1 is relatively little stressed mechanically by the waves 22 since the water is guided towards the collection volume 32 from which it naturally joins the underlying aquatic region 27 which communicates with the deep external aquatic region 26 .

We will now explain how the platform 1 1, which is floating as indicated above, is held in place in the aquatic environment 23.

In general, the buoyancy of the platform 1 1 is provided so that the edge zone 15 is at a predetermined distance below the surface level of the aquatic environment 23.

This predetermined distance is that which is suitable for the correct operation of the wave generator 12. To maintain the platform 11 against the bottom 35 of the aquatic environment 23, links 36 such as chains are provided between the platform 11 and moorings 37 placed on the bottom 35.

There is also a pile 38 fixed to the bottom 35, engaged in a central opening 39 of the platform 11.

When the surface level changes of the platform due to the tide, the platform 1 1 slides towards the pile 38 and the links 36 hold the platform 1 1, in particular to prevent it from rotating around the pile 38 .

As a variant, the platform 11 is held differently with respect to the bottom 35, for example only with links such as 36 or only with piles such as 38.

Here, the platform 1 1 is made of composite materials in the manner of a boat hull wall.

As a variant, composite materials are replaced by other materials used for the manufacture of boat hulls, for example aluminum or wood.

To adjust the buoyancy of the platform 1 1, boxes are provided (not shown) which can be more or less filled with water.

In normal use, the boxes are filled to adjust the buoyancy as just indicated, that is to say so that the edge zone 15 is at the desired predetermined distance below the surface level of the aquatic environment.

If you want the platform 1 1 to emerge more, for example for maintenance operations, the boxes are emptied.

If it is desired that the platform 1 1 sink further, for example to rest on the bottom 35 in the event of a storm, the boxes are filled.

Alternatively, the platform 1 1 is not floating but for example supported by pylons fixed on the bottom 35.

In addition to the platform 1 1 and the wave generator 12, the installation 10 includes a spike 40 secured to the platform 1 1. The spike 40 projects upwards from the wave evolution zone 16 while extending through the internal aquatic region 24 from the culminating zone 17 towards the edge zone 15.

The spike 40 has an upper surface 41 comprising a first lateral zone 42, a second lateral zone 43 situated on the side opposite to the first lateral zone 42 and an intermediate zone 44 extending from the first lateral zone 42 to the second lateral zone 43.

Here, the intermediate zone 44 includes a first peak 45 and a second peak 46, each emerging when the wave generator 12 is at rest.

The intermediate zone 44 also includes a zone 47 in depression relative to the first crest 45 and to the second crest 46, the first crest 45 being located between the first lateral zone 42 and the zone in depression 47, the second crest 46 being between the second lateral zone 43 and the depression zone 47.

More specifically, the first crest 45 is located between the top of the first lateral zone 42 and one of the two peaks of the depression area 47; and the second ridge 46 is located between the top of the second lateral zone 43 and the other top the depression area 47.

The first ridge 45, the second ridge 46 and the area in depression

47 are configured so that when the wave generator 12 is in service, the water at the end of the wave path 22 crosses the first peak 45 or the second peak 46 and falls into a volume 48 delimited by the zone in depression 47, called below volume of collection.

Here, the collection volume 48 of the spike 40 and the collection volume 32 of the platform 11 are vertically contiguous.

More precisely, here, as can be seen in FIGS. 1 to 3, the depression area 47 which delimits the collection volume 48 has a U-shaped profile and the depression area 31 which delimits the collection volume 32 is shaped general frustoconical with an interruption at the level of the ear 40. The depressed areas 31 and 47 are connected at the level of the interruption. The crest 30 of the platform 1 1 is connected at one end to the first crest 45 of the cob 40 and is connected at the other end to the second crest 46 of the cob 40.

On the side opposite to that where it is connected to the collection volume 32, the collection volume 48 here opens at the junction between the wave evolution zone 16 and the edge zone 15.

The collection volume 48 is thus in fluid communication with the upper external aquatic region 25 via the part of the internal aquatic region 24 which is situated above the edge zone 15.

Openings 49, similar to openings 33, are formed through the lowest part of the wall which forms the depressed area 47. The openings 49 open respectively into the collection volume 48 and into the underlying aquatic region 27 .

The collection volume 48 is thus in fluid communication, via the underlying aquatic region 27, with the deep external aquatic region 26.

The water at the end of the course of the waves which has fallen into the collection volume 48 is thus discharged towards the deep external aquatic region 26 and / or the upper external aquatic region 25.

The collection volume 48, by virtue of the fact that it joins the collection volume 32, can participate in the evacuation of the water fallen into the collection volume 32.

The subjugation between the platform 1 1 and the spike 40 is here carried out because the platform 1 1 and the spike 40 are in one piece, the platform 1 1 and the spike 40 being produced jointly from composite materials like a boat hull wall.

Alternatively, the ear 40 is an insert on the platform 1 1.

The wave generator 12 comprises, as indicated above, four water drive elements 20, each movable along the predetermined path 21, which is here circular. Each movable element 20 moves above the edge zone 15, in the direction shown by arrows in FIG. 4, entraining water towards the wave evolution zone 16.

More precisely, each mobile element 20 is followed laterally by a wave 22 moving towards the wave evolution zone 16. In contact with the wave evolution zone 16, the wave 22 breaks towards the culminating zone 17.

The movable elements 20 are arranged on the path 21 while being angularly equidistant.

The generator 12 of artificial waves is of a well-known type, for example as described by American patent 3,913,332.

It will be noted that it is possible to shape the mobile elements 20 so that they can also generate waves by moving in the opposite direction to that illustrated in FIG. 4.

The installation 10 thus offers surfers the possibility of riding on waves breaking to the right or on waves breaking to the left, depending on the direction of movement of the mobile elements 20.

The upper surface 14 of the platform 1 1 comprises here, between the edge zone 15, which is horizontal, and the wave evolution zone 16, which is inclined, a shoulder zone 50 which is vertical or substantially vertical.

The shoulder zone 50 creates an obstacle to the propagation of the water set in motion by the mobile element 20, which is favorable to the quality, for the practice of surfing, of the wave generated before it breaks on the wave evolution zone 16.

The spike 40, which is arranged across the internal aquatic region 24, makes it possible to interrupt a possible stream of water rotating around the culminating zone 17.

It will be noted in particular that the waves 22 are stopped by the spike 40; and that after the mobile element 20 has crossed the spike 40 a new wave 22 starts in calm water or in any case which has not been disturbed by the previous wave 22. The presence of the upper external aquatic region 25 is also favorable for limiting the currents in the internal aquatic region 24.

Alternatively, the ear is used in a facility where there is no external aquatic region.

To avoid as much as possible the backlash, the first lateral zone 42 of the spike 40, which is the one that is most stressed by the waves 22 since the mobile elements 20 rotate in the direction in which they approach this lateral zone, is provided of arrows 51.

As explained above, the spur 40 is also used for the evacuation of water at the end of the course of the waves.

To prevent the mobile elements 20 from bringing water into the collection volume 48, appropriate measures are implemented, for example a shutter which closes the outlet to the outside of the collection volume 48 when the mobile element 20 passes in front, or the path 21 is configured so that the movable elements 20 pass above the surface of the water at this location.

Alternatively, the spike 40 does not have a collection volume 48, for example by having the intermediate zone 44 of its upper surface 41 which is replaced by a simple ridge.

In another variant not shown, the installation 10 does not include an ear such as the ear 40.

We will now describe, using FIG. 6, a variant of the installation 10.

For convenience, the same reference numerals have been kept for similar elements as for installation 10 illustrated in FIGS. 1 to 5.

In general, the installation 10 illustrated in FIG. 6 is similar to the installation 10 illustrated in FIGS. 1 to 5, except that the support which provides the upper surface 14 is not a platform located above an underlying aquatic region but a substrate 55 forming part of the ground and surrounded by an annular basin 56 whose bottom surface 54 is much lower than the edge zone 15; and that the water of the aquatic medium 23 is treated water, in this case swimming pool water. To implement the fluid communication located under the upper surface 14 of the support formed by the substrate 55, conduits 57 are provided in the substrate 55. Each conduit 57 opens at one end, through an opening 58, in the collection volume 32 of the substrate 55 and, at the other end, through an opening 59, in the deep aquatic region 26.

Here, the substrate 55 and the annular basin 56 are formed by a masonry structure.

In variants not shown:

the number of movable elements such as 20 of the wave generator such as 12 is different from four, for example one, two, three or more than four;

an emerged island is provided in the center of the collection volume such as 32 of the support such as the platform 11 or the substrate 55, for example an island on which buildings are arranged;

the path such as 21 of the movable element or elements such as 20, and therefore the contour of the support such as the platform 1 1 or the substrate 55 is annular without being circular, for example oval, oblong and / or with undulations; or this path is not annular, for example straight or curved.

OBJECT OF THE INVENTION

The invention aims to provide an artificial wave installation of the same kind but whose generator of artificial waves is more efficient.

To this end, the invention proposes an installation with artificial waves for the practice of surfing, comprising:

a support having an upper surface comprising an edge zone, a wave evolution zone and a culminating zone, the wave evolution zone extending, in an upward slope, from the edge zone to the culminating zone ;

water above said edge area and said wave course area;

an artificial wave generator comprising at least one mobile water entrainment element above the edge area along a predetermined path, said wave generator and said upper surface of the support being configured so that when the wave generator is in service, the mobile element is followed laterally by a wave moving in the water towards the wave evolution zone in contact with which the generated wave breaks towards the culminating zone ;

characterized in that said mobile element of the wave generator comprises:

- A first profiled body in a bearing wing, oriented upright, having a leading edge looking towards the front, a trailing edge looking towards the rear, a first main face extending on a first side between the edge d attack and the trailing edge, and a second main face extending from a second side, opposite the first side, between the leading edge and the trailing edge, the first main face looking towards the evolution zone waves, said first body being configured with respect to said predetermined path so that when the wave generator is in use, a lift force directed towards the wave evolution zone is applied to the first body; and

- A second profiled body in a bearing wing, lying down, subject to the first body, projecting at least in part from the first main face of the first body, having a leading edge looking towards the front, a trailing edge looking towards the rear, a first main face extending from a first side between the leading edge and the trailing edge, and a second main face extending from a second side, opposite the first side, between the edge d attack and the trailing edge, the second main face looking down, said second body being configured with respect to said predetermined path so that when the wave generator is in operation, a lift force directed upwards s apply to the second body.

It will be noted that the concepts of front and rear are here conventionally used with reference to the direction of movement provided for the movable element, which goes from the rear to the front.

It is known that when a profiled body in a bearing wing is set in motion in a fluid under certain conditions, in particular the angle of incidence of the relative speed between this body and the chord plane passing through the leading edge and the trailing edge, the body is subjected to a lift force. A deflection of this fluid occurs transversely to the direction of movement, in the direction opposite to the lift force.

Thus, by advancing in the water following the path of the movable element, which is horizontal, the second body deflects the water downwards.

The surface of the water thus has a hollow behind the second body.

Behind this hollow, the surface of the water has a rising front to return to the general level of the surface of the water.

This rising front forms the front of the wave generated by the movement of the mobile element of the wave generator of the installation according to the invention.

Due to the displacement of the movable element, the first body, oriented upright, produces on the water behind the movable element effects tending to cause it to deflect towards the wave evolution zone.

Thus, the interaction of the effects of the first body and the second body causes the wave generated by the movement of the mobile element to follow laterally this mobile element, behind it, moving towards the zone of evolution of waves.

It will be noted that since the water is deflected downwards by the second body to form the hollow behind the movable element, this deflection of the water must not overcome gravity but on the contrary accompanies gravity so that a weak energy is sufficient to form this hollow, and therefore the wave located behind this hollow.

The mobile element can thus be moved in water with relatively little energy, which is favorable to the performance of the installation according to the invention in terms of energy consumption and impact on the aquatic environment on which acts the installation according to the invention.

In addition, this low energy required for generating the wave makes it easier to control its characteristics, including at relatively low speed, which is favorable to the quality of the wave generated for the practice of surfing.

It is in particular possible, thanks to the combined effects of the first body and the second body, to generate a powerful wave, little disturbed by turbulence and correctly oriented towards the wave evolution zone on which it must break.

According to characteristics favorable to the performance of the installation according to the invention:

- the first main face of the second body is an upper face, the second main face of the second body is a lower face, the upper face having a developed length greater than the developed length of the lower face ;

said first body extends above and below said second body;

the leading edge of said second body is in front of the leading edge of said first body;

the trailing edge of said second body is behind the leading edge of said first body and in front of the trailing edge of said first body;

- said second body is profiled in a bearing wing according to the profile

NACA 9630;

a chord plane passing through the leading edge and the trailing edge of the second body made with respect to the horizontal at an angle between 6 ° and 20 °;

- Said movable element further comprises a shutter wall subject to said first body and second body, said shutter wall being oriented upright and disposed laterally along and at a distance from the first body and second body on the side that the second main face of the first looks body ;

the installation further comprises a fixed side wall, oriented upright, that the second main face of the first body looks at;

said artificial wave generator further comprises a drive member of said movable member, said drive member being fixed to said movable member by the top of said first body;

the first main face of the first body is an upper face, the second main face of the first body is a lower face, the upper face having a developed length greater than the developed length of the lower face; said first body is profiled as a bearing wing according to the NACA 9630 profile; and or

a chord plane passing through the leading edge and the trailing edge of the first body made with respect to said predetermined path an angle between 2 ° and 20 °.

BRIEF DESCRIPTION OF THE DRAWINGS

The description of the invention will now be continued with the detailed description of exemplary embodiments, given below by way of illustration and not limitation, with reference to the appended drawings. On these:

- Figures 1 to 6 illustrate an installation of the state of the art, previously described, whose installation according to the invention differs only in the arrangement of the mobile elements of the wave generator;

- Figure 7 is a view similar to the upper part of Figure 4 but for the installation according to the invention, Figure 7 therefore showing a top view of one of the mobile elements of the wave generator of the installation according the invention and the immediate environment of this mobile element;

- Figure 8, 9 and 10 are views of this movable element, respectively in perspective, in front view and in side view;

- Figure 1 1 is a perspective view of the top of the movable member, showing a mounting tab that includes the movable member; and

Figure 12 is a top view of a variant of the movable element which further comprises a shutter wall.

DETAILED DESCRIPTION OF AN EXAMPLE OF EMBODIMENT

As indicated above, the installation 10 ′ (FIG. 7) according to the invention is identical to the installation 10 illustrated in FIGS. 1 to 6, except that the mobile elements 20 of the wave generator 12 are replaced by movable elements 20 'arranged differently.

For convenience, with the exception of the 10 ’and 20’ reference numbers, the same reference numbers have been kept for similar elements as for installation 10 illustrated in FIGS. 1 to 6.

The movable element 20 ′ of the wave generator 12 comprises two profiled bodies in a bearing wing, respectively a body 60 and a body 61. The body 60 is oriented upright, here vertically, and the body 61 is oriented lying, here horizontally.

Bodies 60 and 61 are subject to each other.

The body 60 has a leading edge 62 looking forward, a trailing edge 63 looking back, a first main face 64 extending on a first side between the leading edge 62 and the edge trailing 63, a second main face 65 extending from a second side, opposite the first side, between the leading edge 62 and the trailing edge 63, a first lateral face 67 extending from one to the other of the main faces 64 and 65, and a second lateral face 68 extending from one to the other of the main faces 64 and 65.

The first main face 64 looks towards the wave evolution zone 16. The second main face 65 looks towards the opposite of the wave evolution zone 16. The first lateral face 66 looks upwards. The second side face 67 looks down.

Here, the first main face 64 of the body 60 is an upper face, the second main face 65 of the body 60 is a lower face, the upper face 64 having a developed length greater than the developed length of the lower surface 65.

Here, the body 60 is profiled as a bearing wing according to the NACA 9630 profile.

Here, the chord plane passing through the leading edge 62 and through the trailing edge 63 of the body 60 made with respect to the path 21, and more precisely with respect to the local direction of the path 21 (the tangent to this path at location of the movable element 20 '), an angle of 13 °.

In general, an angle between 2 ° and 20 ° is particularly suitable for producing the desired effects on the water in which the mobile element 20 ′ moves.

The body 61 projects in part from the face 64 of the body 60.

The body 61 has a leading edge 68 looking towards the front, a trailing edge 69 looking towards the rear, an upper surface 70 extending on a first side between the leading edge 68 and the trailing edge 69, a lower surface 71 extending from a second side, opposite the first side, between the leading edge 68 and the trailing edge 69, the upper surface 70 having a length developed greater than the developed length of the underside face 71, a first lateral face 72 extending from one to the other of the faces 70 and 71, and a second lateral face 73 extending from one on the other of the faces 70 and 71.

Face 70 looks down. Face 71 looks up. The face 72 looks towards the wave evolution zone 16. The face 73 looks towards the opposite of the wave evolution zone 16.

Here, the body 60 extends above and below the body 61.

More specifically, the body 60 extends over approximately two thirds of its length above the body 61 and the body 60 extends over approximately one third of its length below the body 61.

Here, the leading edge 68 of the body 61 is in front of the leading edge 62 of the body 60; the trailing edge 69 of the body 61 is behind the leading edge 62 of the body 60 and in front of the trailing edge 63 of the body 60.

Here, the body 61 is profiled as a bearing wing according to the NACA 9630 profile. Here, the chord plane passing through the leading edge 68 and through the trailing edge 69 of the body 61 makes an angle with respect to the horizontal. 13 °.

Generally, an angle of between 2 ° and 20 ° is particularly suitable for producing the desired effects on the water in which the mobile element 20 ′ moves.

For its mounting on the rest of the wave generator 12, the mobile element 12 ′ has at its top a mounting tab 75, shown only in FIGS. 11 and 12.

The tab 75 protrudes from the lateral face 66.

Here, the leg 75 is formed by the extension of a reinforcing beam which comprises the mobile element 20 ’.

To drive the mobile element 20 ’, the wave generator 12 comprises a member, here an arm 76 (FIG. 12) which is fixed to the mobile element 20’ by the tab 75 located at the top of the body 60.

FIG. 12 shows a variant of the movable element 20 ′ which further comprises a shutter wall 77 secured to the first body 60 and the second body 61. Here, the shutter wall 77 is oriented upright and disposed laterally along and at a distance from the first and second bodies 60 and 61 on the side that the face 65 of the body 60 looks at.

The securing between the flap wall 77 and the rest of the movable element 20 ′ is done by an extension of the arm 76 which is caught on a mounting tab 78 located at the top of the flap wall 77.

The wall-flap 77 makes it possible to offer an additional deflection effect of the water situated behind the mobile element 20 ′ and / or a stabilization effect which can be particularly useful in the case where the mobile element 20 ′ is moves at low speed; and / or a protective effect against external disturbances, for example natural waves present in the aquatic environment where the installation is located.

When the installation 10 ′ is implemented as shown in FIG. 6, the fixed lateral wall of the basin 56, oriented upright and that the face 65 of the body 60 looks at, can also offer such an additional deflection effect and / or stabilization.

It will be noted that the edge zone 15 is also capable of participating in the conformation that the water takes behind the mobile element 20 ’; and that in a variant not shown of the movable element 20 ’, the flap wall also includes a portion located under the body 61, or even only under the body 61.

In variants not shown:

the body 60 is oriented upright differently from the vertical orientation, for example with a small inclination or a greater inclination relative to the vertical, being closer to the vertical than to the horizontal;

the body 61 is oriented lying differently from the horizontal orientation, for example with a small inclination or a greater inclination with respect to the horizontal, by being closer to the horizontal than to the vertical;

the mutual arrangement of the bodies 60 and 61 is different depending on the front-rear direction and / or the up-down direction, for example with the body 60 which has a part forward of the body 61 and / or the body 60 which is positioned entirely above the body 61;

the bearing wing profile of the body 60 is different from an asymmetrical profile NACA 9630, for example a symmetrical profile, that is to say that the faces 64 and 65 are in mirror image of each other;

the bearing wing profile of the body 61 is different from an asymmetrical profile NACA 9630, for example another asymmetrical profile NACA or an asymmetrical profile other than NACA; and or

the drive arm 75 is replaced by a drive member other than an arm, for example a rim; and / or the flap wall 77 is subject to the rest of the movable element 20 ’differently than by the extension of an arm, for example by a spacer connected to a rim.

Many other variants are possible depending on the circumstances, and it is recalled in this regard that the invention is not limited to the examples described and shown.

Claims

1. Installation with artificial waves for the practice of surfing, comprising:

- A support (1 1; 55) having an upper surface (14) comprising an edge zone (15), a wave evolution zone (16) and a culminating zone (17), the wave evolution zone (16) extending, in an upward slope, from the edge zone (15) to the culminating zone (17);

water located above said edge area (15) and said wave course area (16);

an artificial wave generator (12) comprising at least one movable water entrainment element above the edge area (15) along a predetermined path (21), said wave generator (12) and said upper surface (14) of the support (1 1; 55) being configured so that when the wave generator (12) is in operation, the movable element is followed laterally by a wave (22) moving in the water towards the area d wave evolution

(16) in contact with which the wave (22) generated breaks towards the culminating zone

(17);

characterized in that said mobile element (20 ’) of the wave generator (12) comprises:

- A first body (60) profiled in a bearing wing, oriented upright, having a leading edge (62) looking towards the front, a trailing edge (63) looking towards the rear, a first main face (64) extending from a first side between the leading edge (62) and the trailing edge (63), and a second main face (65) extending from a second side, opposite the first side, between the leading edge (62) and the trailing edge (63), the first main face (64) looking towards the wave development zone (16), said first body (60) being configured with respect to said predetermined path (21) so that when the wave generator (12) is in use, a lift force directed towards the wave course area (16) is applied to the first body (60); and

- A second body (61) profiled in a bearing wing, lying down, subject to the first body (60), projecting at least in part from the first face main (64) of the first body (60), having a leading edge (68) looking towards the front, a trailing edge (69) looking towards the rear, a first main face (70) extending from 'a first side between the leading edge (68) and the trailing edge (69), and a second main face (71) extending on a second side, opposite the first side, between the leading edge (68) and the trailing edge (69), the second main face (71) looking down, said second body (61) being configured with respect to said predetermined path (21) so that when the wave generator (12) is in service, an upwardly directed lift force is applied to the second body (61).

2. Installation according to claim 1, characterized in that the first main face (70) of the second body (61) is an upper surface, the second main face (71) of the second body (61) is a face of lower surface, the upper surface (70) having a developed length greater than the developed length of the lower surface (71).

3. Installation according to any one of claims 1 or 2, characterized in that said first body (60) extends above and below said second body (61).

4. Installation according to any one of claims 1 to 3, characterized in that the leading edge (68) of said second body (61) is in front of the leading edge (62) of said first body (60).

5. Installation according to any one of claims 1 to 4, characterized in that the trailing edge (69) of said second body (61) is behind the leading edge (62) of said first body (60) and in before the trailing edge (63) of said first body (60).

6. Installation according to any one of claims 1 to 5, characterized in that said second body (61) is profiled in a bearing wing according to the NACA 9630 profile.

7. Installation according to any one of claims 1 to 6, characterized in that a chord plane passing through the leading edge (68) and through the trailing edge (69) of the second body (61) made by with respect to the horizontal an angle between 6 ° and 20 °.

8. Installation according to any one of claims 1 to 7, characterized in that said movable element (20 ') further comprises a wall-flap (77) secured to said first body (60) and second body (61), said wall-flap (77) being oriented upright and disposed laterally along and at a distance from the first body (60) and second body (61) on the side facing the second main face (65) of the first body (60).

9. Installation according to any one of claims 1 to 8, characterized in that it further comprises a fixed side wall (56), oriented upright, that looks at the second main face (65) of the first body (60).

10. Installation according to any one of claims 1 to 9, characterized in that said artificial wave generator (12) further comprises a drive member (76) of said movable member (20 '), said drive member (76) being fixed to said movable element (20 ') by the top of said first body (60).

1 1. Installation according to any one of claims 1 to 10, characterized in that the first main face (64) of the first body (60) is an upper surface, the second main face (65) of the first body (60) is a lower face, the upper face (64) having a developed length greater than the developed length of the lower face (65).

12. Installation according to claim 1 1, characterized in that said first body (60) is profiled in a bearing wing according to the NACA 9630 profile.

13. Installation according to any one of claims 1 to 12, characterized in that a chord plane passing through the leading edge (62) and through the trailing edge (63) of the first body (60) made by report to said predetermined path (21) an angle between 2 ° and 20 °.