WO2015173477A1

WO2015173477A1 - System for forming an artificial wave

Info

Publication number: WO2015173477A1
Application number: PCT/FI2015/050339
Authority: WO
Inventors: Pauli Immonen; Atso Andersén; Markku Jussila
Original assignee: Artwave Surf Oy
Priority date: 2014-05-16
Filing date: 2015-05-15
Publication date: 2015-11-19
Also published as: GB201605158D0; GB2540836A; EP3142762B1; AU2015261348A1; FI20145445A; AU2015261348B2; GB2540836A8; FI125474B; EP3142762A1; US20170239580A1; WO2015173477A4

Abstract

The invention discloses a system for forming an artificial wave (W) in a water environment, which comprises a pulling apparatus (6), a pulled apparatus (10, 10a, 10b, 10c, 10d) and a pulling arrangement (11), wherein the pulling apparatus (6) comprises a power pack (12) and the pulled apparatus (10) comprises a wave-forming profile (13), wherein the pulling arrangement (11) comprises at least two pulleys (14, 15) and at least one rope or line (16) provided at or via both ends of the pulled apparatus (10) and further via the pulleys (14, 15) for providing the movement of the pulled apparatus (10) between a first pulley (14) and a second pulley (15). According to the invention, the wave-forming profile (13) comprises at least two wings (1, 2), of which at least one wing (1, 2) is mainly transverse relative to the direction of advancement (A) of the pulled apparatus (10, 10a, 10b, 10c, l0d).

Description

SYSTEM FOR FORMING AN ARTIFICIAL WAVE

FIELD OF THE INVENTION The invention relates to a system for forming an arti^¬ ficial wave in a water environment. The artificial waves provided by the system are comparable to moving natural waves that occur in a body of water. BACKGROUND OF THE INVENTION

Surfing is globally a very popular form of sports and physical activity. People who engage in different boardsports are often regarded as a homogeneous group. Even if each one had their own favorite sport, it is typical that they share an interest in other similar sports. Very often especially surfing is brought up as a sport that one would readily play if only right con^¬ ditions existed. In many countries, surfing is very minimal because the waves required for the sport are difficult to find. However, people showing an interest in the sport are active and quite many have tried the sport when traveling in areas where good conditions for surfing are available.

The requirements for surfing are basically very sim^¬ ple. The necessary elements include a wave, a surfing board, optionally a wetsuit and basic surfing skills. The only requirement making the situation difficult is that of a wave. Thus, a great deal of effort has been made throughout the world to form artificial surfable waves, giving rise to many different ways to enable artificial surfing.

Thus, many different ways of artificial surfing are known from the prior art, of which ways some will be described below.

The so-called "sheet wave" technology provides a surf^¬ ing experience through riding on a board along a spe- cifically shaped plane surface on flowing water. Many such devices have been built and patented throughout the world. The "sheet wave" technology is often criti^¬ cized as the experience is not one of genuine surfing. The device is considered as a trick-performing plat- form because it does not involve movement on real waves and the environment is quite unauthentic.

Artificial wave pools have been developed with many different methods. One concept involves building a large artificial pool and forming a wave therein with a controlled wing profile that is pulled along the bottom of the pool. One such solution is described in published patent application US 2010/0017951 Al . As drawbacks of this solution, e.g., the pool is very ex- pensive to build, and in order to work it requires, among other things, a controllable shape of the bottom and a possibility of entirely emptying the pool for maintenance. Another similar solution is described in patent US 3,802,697, wherein a wave-forming profile is moved on the bottom of a channel. In this patent, the apparatus requires a channel or other similar man-made construction for rotating the wave profiles by means of a chain moved with two sprockets. In this patent, several profiles are used, and they rotate in continu^¬ ous circulation over the sprockets. As above, the pa^¬ tent is not intended for use in natural conditions, but is mostly intended e.g. for teaching surfing or for example for use in a boat model testing facility, and requires of the operating environment the channel structure as mentioned above. In terms of its opera^¬ tion, the solution described in published patent ap- plication US 2003/0119592 Al also falls within the same category, as it comprises moving a two-sided wing set along a track so as to provide an advancing wedge- shaped wave formation on the sides of the wings. Also, patent EP 2123 850 Al describes a similar solution wherein e.g. the bottom of a pool is provided with a floor, on both sides of which there are drive mecha^¬ nisms for pulling a profile along groove-shaped trac^¬ tor elements provided on the bottom of the pool so as to form an artificial wave. However, this requires groove-shaped tracks or similar elements to be in^¬ stalled in the surfing area.

Another wave pool concept is based on a circular, oval or curved pool wherein a continuous wave is formed with a wing profile advancing along the edge of the pool. This type of a pool is also very expensive to build, even more so than the above-mentioned artifi^¬ cial wave pool type. One such solution is described in patent US 3,913,332. Another circular wave pool con- cept is described in patent US 6,336,771 Bl, wherein the pool and the body of water contained therein are rotated, and a standing wave is formed by wing-shaped structures below the surfer. However, this surfing environment limited to a circular pool is, in terms of the surfing experience, very unauthentic in comparison to natural surfing, and the apparatus is mostly in- tended e.g. for waterpark or resort use. The apparatus does not provide a naturally moving artificial wave but a standing wave. It is also mentioned in the pa^¬ tent that the wave-forming apparatus can be towed by a boat .

Wave pools for surfing have also been built with techniques often originally used for wave machines in swimming pools. Obviously, to apply these it is also required that a suitable pool be built. These methods enable the formation of very natural waves, as the wave is typically provided with energy only at the stage when it is created, and its advance and shape are completely dependent on the shape of the bottom of the pool.

One type of providing an artificial wave is formed by wave machines towed by a boat. They are most often based on different kinds of wings towed by a boat. The known solutions use one wing which is typically formed in a V-shape and moves freely as it is suitably stabi^¬ lized. One device towed by a boat is described in pa^¬ tent US 5,911,190. The device consists, in addition to a V-profile, of a stabilizing keel-like wing and a stabilizer disposed in front of the device. Another similar solution is described in patent US 6,047,657. A third similar device towed by a boat is described in patent US 5,860,766 A. The wave is typically formed by devices towed by a boat so that it advances in a wedge-shaped formation behind the boat. Thus, the breaking thereof can be controlled by selecting the profile of the bottom of the water area correctly.

Yet another type of providing an artificial wave is formed by the apparatus described in patent US 2013/0199433. In this apparatus, a wave-generating hull is pulled in water with a driving mechanism dis- posed at the water's edge. In the driving mechanism, a drum is rotated for example by a truck, and a cable is laid from the drum via a guide device disposed on the bottom of the water area to one end of the movable hull. However, the apparatus is able to pull the hull in one direction only, and the driving mechanism is to be securely disposed for example in a pit cut into rock or dug in the ground. Using a car as a power source is not the best alternative in terms of ecolo^¬ gy, operating efficiency or cost-effectiveness. The apparatus requires that fixed structures must be built near shoreline and/or on the bottom of the water area, as well as another moving apparatus such as a boat or a water jet which must be used every time after surfing for pulling the hull back from the shoreline to a starting place farther away in the surfing area.

OBJECTIVE OF THE INVENTION

The objective of the invention is to eliminate or at least alleviate the problems mentioned above and in- troduce solutions for it. SUMMARY OF THE INVENTION

A new system has now been invented for forming an artificial wave. The invention discloses a system for forming an artificial wave in a water environment, which comprises a pulling apparatus, a pulled apparatus and a pulling arrangement, the pulling apparatus comprising a power pack and the pulled apparatus comprising a wave- forming profile. According to the invention, the pulling arrangement comprises at least two pulleys and at least one rope or line provided substantially at or via both ends of the pulled apparatus and further via the pulleys for providing the movement of the pulled apparatus between a first pulley and a second pulley. In one solution, the rope or line is provided right at the end of the pulled apparatus. Substantially at both ends means that the rope or line is provided for exam^¬ ple at less than one meter from the end of the pulled apparatus towards the center of the pulled apparatus. In one solution, the rope or line is provided on hang^¬ ers provided in connection with the ends of the pulled apparatus. Preferably, the wave-forming profile is floating. In one embodiment, the first pulley and the second pulley are floating. In one solution, the first pulley and the second pulley are anchored in water in a fixed place.

In one embodiment, the rope or line is endless and/or forms a loop via the first pulley and the second pul^¬ ley. In one solution, the rope or line is provided as a loop to extend through the pulled apparatus and is fixed to one or more points to the pulled apparatus.

The pulling apparatus is preferably provided on the shore. In one solution, the pulling apparatus is pro- vided on a ship, a vessel, a barge or other water- craft. The power pack is preferably electrically oper^¬ ated .

In one solution, the system comprises a structure that floats or that is disposed in and/or on water and an^¬ chored in place for providing the pulling apparatus thereon. In one embodiment, the pulling apparatus is provided on a pier that is fixed in its place in or on water or on other similar structure bearing the load of the pulling apparatus that is disposed in or on wa^¬ ter so as to float or be fixed to the bottom of the water area.

In one embodiment, the wave-forming profile comprises at least two wings, of which at least a first wing is mainly transverse relative to the direction of ad^¬ vancement of the pulled apparatus. In one embodiment, the wave is formed through a combined effect of the wings, whereby at least one of the wings of the pulled apparatus is provided in such a way that, as the pulled apparatus moves, it guides the flow of water in a downward direction to form the wave's trough, and whereby at least one other second wing of the pulled apparatus following the wing that guides the flow in a downward direction is arranged to guide the flow of water in an upward direction to enhance the movement of water that flows back up to form the crest for the wave. In one embodiment, the wings are positionable relative to each other and to the direction of ad^¬ vancement of the pulled apparatus for adjusting the movement and/or floating characteristics of the pulled apparatus. The wings can thus be positionable relative to each other in terms of distances and angles, as well as in terms of the transverse direction relative to the distance between the wings and of the water surface. Thus, the wave height can be adjusted by ad^¬ justing the wings relative to each other. In one em- bodiment, at least one wing of the pulled apparatus is angled from the transverse direction relative to the direction of advancement. Preferably, the wings are hollow and/or floating. In one embodiment, the system comprises an anchoring arrangement for holding the pulling apparatus in place on the shore, comprising a tank which is to be filled with water. In this case, the tank may be a transportation container in which the components of the system are adapted to be housed and/or transported. In this case, the pulling apparatus may comprise a water pump for filling and/or emptying the tank. In one solution, the suction and the discharge line of the water pump in the pulling apparatus are provided in connection with the body of water used as a surfing area, the wa^¬ ter pump being thus able to both fill and empty the tank. The water-filled tank functions as a counter^¬ weight for the pulling apparatus, whereby the tank supports the holding in place of the pulling appa- ratus . After emptying the tank it is possible to move all the components required for the system into the emptied tank and to use the tank as a transportation container for moving the entire system to another place or storing it for example for winter.

In one embodiment, a floating apparatus is provided in connection with the second pulley for holding the second pulley at the correct depth. In one solution, a first anchor is provided in connection with the second pulley and/or the floating apparatus for anchoring the second pulley and/or the floating apparatus in place. Preferably, the floating apparatus is provided with a pontoon-like structure.

In one embodiment, the pulling apparatus comprises a third pulley, wherein the space between the first pul- ley and the third pulley is provided with drive elements for arranging the drive between the power pack and the pulling arrangement. The drive element is preferably one or more endless ropes, wires, cables, belts or chains provided via the third pulley and the first pulley. In one embodiment, the drive element forms a loop via the third pulley and the first pul^¬ ley. In one solution, the first pulley and the third pulley are provided with teeth for arranging a chain drive between the pulleys, whereby a chain is being used as the drive element. One possible solution is to use a Cardan joint as the drive element for providing the drive between the first pulley and the third pul^¬ ley. In one embodiment, the rotation of the drive ele^¬ ment can be adjusted for adjusting the height of the wave.

In one embodiment, the system comprises a pushing ap^¬ paratus provided between the pulling apparatus and the first pulley for pushing the first pulley to a suita- ble depth in water. Preferably, the pushing apparatus is a device operated from the shore and having a rigid beam-type or pole-type structure for controlling the position of the first pulley in water or alternatively holding it in place. In one solution, the pushing or moving of the pushing apparatus is provided by a hy^¬ draulic cylinder and/or with a telescopic structure. In one embodiment, the tightness of the rope or line is adjusted with the pushing apparatus. The pushing apparatus is preferably used for adjusting the posi^¬ tion of the first pulley and the second pulley rela^¬ tive to each other. In one embodiment, the first pul^¬ ley is alternatively provided on the bottom of the wa^¬ ter area in a fixed or detachable manner, whereby there is no need for a pushing apparatus.

Preferably, the rope or line comprises floating mate^¬ rial. The rope can be manufactured for example from polyethylene. The pulling arrangement allows the move- ment of the pulled apparatus in the direction of ad^¬ vancement or in the opposite direction. In one embodi^¬ ment, the pulling arrangement forms a rope drive, by means of which the pulled apparatus is also moved in the opposite direction relative to the direction of advancement for returning the pulled apparatus to its initial position.

In one embodiment, the pulled apparatus comprises a stabilizing structure for stabilizing the movement of the pulled apparatus in water. In one solution, the stabilizing structure is a third wing and/or one or more weights disposed in the pulled apparatus for sta^¬ bilizing the movement of the pulled apparatus in wa- ter. In one embodiment, the pulled apparatus is pro^¬ vided with stabilizing structures installed in the ap^¬ paratus for stabilizing the movements of the pulled apparatus. Preferably, the stabilizing structures com- prise at least one pontoon installed in the pulled ap^¬ paratus and/or a keel installed below the pulled appa^¬ ratus or aerofoils installed in the apparatus.

In one embodiment, the system comprises an automation and control system for automatizing the operation of the system. In this case, the system may comprise a control center for adjusting and controlling the system. In one embodiment, the pulled apparatus comprises ac^¬ tively adjustable and/or fixed aerofoils that guide the travel of the pulled apparatus. In one embodiment, the pulled apparatus comprises weights and/or floats that contribute to the balance of the pulled appa- ratus . In one embodiment, the pulled apparatus com^¬ prises a keel installed below the pulled apparatus for balancing the pulled apparatus. In one embodiment, the position and/or traveling depth of the pulled apparatus are controlled by adjusting the pulling speed of the pulled apparatus.

In one embodiment, the system comprises at least two pulling apparatuses which are positioned at each end of the pulling arrangement.

The invention discloses a second embodiment of a sys^¬ tem for forming an artificial wave. The system com- prises a pulled apparatus, at least a first pulling apparatus and a second pulling apparatus, each pulling apparatus comprising a power pack and the pulled appa^¬ ratus comprising a wave-forming profile. At least one rope or line coupled to the first pulling apparatus and to the second pulling apparatus is provided sub^¬ stantially at or via both ends of the pulled apparatus for providing the movement of the pulled apparatus be^¬ tween the first pulling apparatus and the second pull- ing apparatus. The wave-forming profile comprises at least two wings, of which at least one wing is mainly transverse relative to the direction of advancement of the pulled apparatus. The above-described one or more embodiments of the system allow advantages as compared to prior art. The system as described has few requirements for the oper^¬ ating environment. In order to function, the system does not require e.g. large pools, floors installed on the bottom of the water environment, track structures, channels or other heavy structures built in water with high cost. Neither does the mass of water need to be rotated with a motorized rotatable apparatus. Furthermore, the system is movable and may be packed in the tank used as a container to be moved away to another place from the operating area, which allows making use of new operating sites. The tank may be quickly emptied with an efficient pump. Furthermore, as the tank filled with water functions as a weight, the pulling apparatus need not be, for example, fixed by bolting or cutting into rock, which would increase the costs for deploying the system. The mobility of the system enables the implementation of the system without fixed structures by which it should be fixed to a base, whereby it has a low impact on the environ^¬ ment or nature. The system does not require for exam- pie a foundation made of concrete. When the system is disassembled from the operating site, the site will be left in the state prevailing before the system was de^¬ ployed. If the entire system is arranged to float, it may be easily moved and taken to a suitable place in the water area and anchored in place.

Surfing will be performed in a natural environment so as to give a more natural and thereby better surfing experience than for example a pool-type apparatus. If the wave-forming apparatus is towed by a boat, power^¬ ful boats must be provided with high cost. With the above-described system, the wave-forming profile need not be towed by a boat; the system is instead used from the shore. A car is not required as a power source for using the system, and another separate apparatus that travels in water is not required to re^¬ turn the pulled apparatus. Thus, the manufacturing and operating costs of the system are reduced, as addi^¬ tional devices for operating the system need not be provided.

The height of the wave can be adjusted for example by adjusting the wings relative to each other, whereby the surfing event can be tailored according to the surfer's wishes. The pulling speed can be adjusted by means of the pulling apparatus, which can also be car^¬ ried out according to the surfer's wishes or the de- sired wave height. Furthermore, the entire system is automatizable by means of the automation system to avoid additional costs due to several manual opera^¬ tions. In addition to the automation system, the sys- tern may be provided with a control center, from which for example the components affecting the wave height can be controlled and the surfing event as well as the surrounding surfing conditions supervised. This makes surfing safer.

The power pack may receive electric energy for example through wind power, hydropower or other renewable energy resources, the operation of the apparatus thus having a smaller burden on the environment. Alterna- tively, a small wind turbine can be provided in con^¬ nection with the system, or the system can be provided with solar cells, whereby the use is even more ecolog^¬ ical . Other advantages and characteristics of the invention are disclosed in the description below where the sys^¬ tem is described with reference to the accompanying exemplary figures; the system is not to be limited to any detail of the figures, which merely illustrate different embodiments of the system.

LIST OF FIGURES

The accompanying figures, which are included to pro- vide a further understanding of the invention and constitute a part of this specification, illustrate em^¬ bodiments of the invention and together with the de- scription help to explain the principles of the inven^¬ tion. In the figures:

Fig. 1 is a fully schematical illustration produced by simulation software of a cross section of a pulled ap^¬ paratus in the system according to the invention and of a wave produced thereby;

Fig. 2 is an illustration produced by simulation soft- ware of a flow pattern in wave formation;

Fig. 3 illustrates one example of an apparatus pulled in water for use in the system; Fig. 4 illustrates one possible solution of an appa^¬ ratus pulled in water;

Fig. 5 schematically illustrates one example of the system;

Fig. 6 schematically illustrates one example of the system;

Fig. 7 illustrates one possible solution of an appa- ratus pulled in water;

Fig. 8 illustrates one possible solution of an appa^¬ ratus pulled in water; Fig. 9 illustrates one possible solution of an appa^¬ ratus pulled in water; Fig. 10 schematically illustrates one example of the system; and

Fig. 11 schematically illustrates one example of the system.

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the embodi^¬ ments of the present invention, examples of which are illustrated in the accompanying figures. In the accom^¬ panying figures, similar components are referred to by the same numbers.

The wave-forming profile 13 of a pulled apparatus 10 is not intended to be limited merely to a wing-like structure; it can be any wave-forming profile such as a plow-like V-shaped profile or the like, by which an artificial wave W is provided. As an example, one so^¬ lution of a wave-forming profile 13 and two preferred embodiments of a pulled apparatus 10 will be disclosed below. In Fig. 1, a wave W is formed on or in immediate prox^¬ imity to a trailing wing, i.e. a second wing 2. The effect is shown in accompanying Fig. 1. The mechanism of the formation of the wave W is better illustrated in accompanying Fig. 2, which shows the flow pattern of the flow effect shown in Fig. 1. In both figures, the direction of advancement of the pulled apparatus is indicated with reference letter A. In contrast to single-wing wave machines, the wave W is thus formed through a combined effect of two wings 1, 2. A first wing 1 of the pulled apparatus guides the flow in a downward direction towards the bottom of the water environment, forming a trough Wi for the wave W. The trailing second wing 2 enhances the move^¬ ment of water that flows back up and thus raises the crest W2 of the wave. The wings 1, 2 are sized and po- sitioned in a precise configuration relative to each other and the water surface S to create said interac^¬ tion. The wave W is to be made as much as a natural wave as possible. The operating parameters for the formation of the wave W are determined e.g. as a func- tion of the angles of attack, distance between the wings and pulling speed.

Fig. 3 and 4 are schematical illustrations of two dif^¬ ferent implementations of the apparatus 10 pulled in water. In Fig. 3 and 5, the pulled apparatus is gener^¬ ally indicated as reference number 10 and, respective^¬ ly, in Fig. 4 as 10a. In the case of Fig. 3, the front and rear wing 1, 2 of the pulled apparatus 10 are fixed at their ends to frame beams 3 at a specific distance d from each other. The wings 1, 2 are further fixed to the frame beams 3 at specific angles , β in such a way that the angle of attack of the wings 1, 2 relative to water or to the direction of advancement A is as desired. In this case, the wings 1, 2 are also disposed at a desired angle relative to each other. The distance d between the wings 1, 2 from each other and their angle relative to each other are interde- pendent and essential in terms of wave formation and the depth at which the pulled apparatus 10 travels when it is pulled. The point of pulling the pulled ap^¬ paratus 10 is indicated in Fig. 3 and 4 as 4, 4a. In some cases it is preferred that at least one of the wings 1, 2 of the pulled apparatus 10 is fixed to the frame beams 3 in an adjustable manner in such a way that the angle between the wings 1, 2 can be adjusted if necessary. The pulled apparatus 10a according to Fig. 4 differs from the one illustrated in Fig. 3 in that the apparatus 10a comprises one central frame beam 5 to which the front and rear wing 1, 2 are fixed at a distance d from each other. It is also preferred in the case of Fig. 4 that the angle of attack of the wings 1, 2 relative to water may be adjusted. The wings 1, 2 of Fig. 3, 4 may be hollow.

The material of the surface of the wings 1, 2 and of the frame 3, 5 of the pulled apparatus 10 may vary. Furthermore, the structure of the pulled apparatus 10 may vary in terms of support, fixing of the pulling point and stabilizers (not illustrated) . One possible material of the wings 1, 2 and/or the frame 3, 5 is aluminum. The wings 1, 2 can be attached together with frame beams 3 disposed on the sides as shown in Fig. 3. The wings 1, 2 can also be attached together with only one frame beam 5 disposed in the center of the wings 1, 2 as in Fig. 4. For the wave W to be surfable, it may not advance so as to be perpendicular all over relative to the direc^¬ tion of advancement A. In practice, this requires that the ends of the wave W must have a section that breaks in a specific manner. This can be provided by suitably shaping the wings 1, 2 or at least one wing of the pulled apparatus 10 in the width direction. One possi- bility is to make at least one wing 1, 2 of the pulled apparatus 10 V-shaped. A similar effect may be reached by installing at least one of straight wings 1, 2 of the pulled apparatus 10 obliquely relative to the di^¬ rection of advancement A.

Below, with reference to Fig. 5, one example of the system of the invention will be described. Fig. 5 shows that the pulled apparatus 10 of the system is provided with a wave-forming profile 13 which compris- es two wings 1, 2. However, it is possible to enhance the formation of the artificial wave W and/or shape the resulting wave W by using more than two wings in the pulled apparatus 10. As stated above, the actual shape of the wings may vary. The wings or at least one of them can be e.g. straight, V-shaped, curved etc. The wing may be V-shaped in a plane extending parallel to the surface of water as well as in a plane extend^¬ ing perpendicular to the direction of advancement. Other shapes are also possible. Furthermore, the cross section of the wing 1, 2 may vary even within one wing, and it may be e.g. curved in several directions, and the wings 1, 2 may be hollow.

Fig. 5 shows one example of a system for forming an artificial wave W in a water environment, comprising a pulling apparatus 6, a pulled apparatus 10 and a pull^¬ ing arrangement 11, wherein the pulling apparatus 6 comprises a power pack 12 and the pulled apparatus 10 comprises a wave-forming profile 13. The pulling arrangement 11 comprises at least two pulleys 14, 15 and at least one rope or line 16 provided at or via both ends of the pulled apparatus 10 and further via the pulleys 14, 15 for providing the movement of the pulled apparatus 10 between a first pulley 14 and a second pulley 15. Substantially at both ends of the pulled apparatus 10 means that the rope or line 16 can be fixed right to the end of the pulled apparatus 10 or for example at less than one meter from the end of the pulled apparatus 10. The wave-forming profile 13 is preferably floating. The rope or line 16 can be provided so as to be fixed to the pulled apparatus 10 in many different ways. In one solution, the rope or line 16 can also be fixed in connection with the end of the pulled apparatus 10, in which case the pulled apparatus 10 is provided with hangers which for example protrude from the pulled ap^¬ paratus 10 at the end of the pulled apparatus 10. In this case, the rope or line 16 is fixed to the hangers disposed at both ends of the pulled apparatus 10. The rope or line 16 is preferably endless and/or forms a loop via the first pulley 14 and the second pulley 15. The rope or line 16 can alternatively be provided in such a way that it is fixed to the pulled apparatus 10 at one point only, e.g. at the center or near the center of the pulled apparatus 10. However, this re^¬ quires that the rope or line 16 is to be guided to the pulleys 14, 15 via both ends of the pulled apparatus 10 in order that rotation of the pulled apparatus 10 by the effect of water can be prevented. In this case, the rope or line 16 is not fixed to both ends of the pulled apparatus 10. The rope or line 16 can alterna- tively be provided in such a way that the rope or line 16 extends through the pulled apparatus 10 in a con^¬ tinuous configuration or with the ends of the rope or line 16 attached together, in which case the rope or line 16 is a loop and may can be fixed to one or more points of the pulled apparatus 10. If the rope or line 16 is only fixed to the pulled apparatus 10 at one point, the pulled apparatus 10 must be prevented from rotating by guiding the rope or line 16 as described above .

The location of the pulling apparatus 6 may can be se^¬ lected according to the operating site selected by the user of the system. A simple way is to place the pull^¬ ing apparatus 6 on the shore. If the pulling apparatus 6 is placed on the shore, it means herein that the pulling apparatus 6 is placed on the shore right at the water's edge, in shallow water or farther away from the water's edge in the shore area. Alternative^¬ ly, however, the pulling apparatus 6 may be provided on a ship, a vessel, a barge or other watercraft (not illustrated) . In this case, the pulling apparatus 6 may can be placed for example on the deck of a ship and/or at the stern of a ship (not illustrated) . The driving force for the pulling apparatus 6 and for the power pack 12 is most preferably electricity. A third example of the location of the pulling apparatus 6 is to provide the pulling apparatus 6 on a structure 27 that is included in the system so as to float or be disposed in and/or on water and anchored in place. One example of a suchlike structure 27 is shown and de^¬ scribed below with reference to Fig. 6.

The pulled apparatus 10 is pulled for example at a depth of 1-3 meters from the water surface S. The pulling distance may be hundreds of meters. Prefera^¬ bly, the suitable water area is several meters deep.

The wave-forming profile 13 comprises at least two wings 1, 2, of which at least a first wing 1 is mainly transverse relative to the direction of advancement A of the pulled apparatus 10. As the wings 1, 2 are po- sitionable relative to each other and to the direction of advancement A of the pulled apparatus 10, the move^¬ ment and/or floating characteristics of the pulled ap^¬ paratus 10 may be adjusted. As described above with reference to Fig. 3 and 4, also in Fig. 5 the wings 1, 2 are positionable relative to each other in terms of distances d and angles , β, as well as in terms of the transverse direction relative to the distance be^¬ tween the wings 1, 2 and of the water surface S. The height of the resulting wave W may thus be adjusted by adjusting the wings 1, 2 relative to each other. The wings 1, 2 are preferably hollow and/or floating.

The system comprises an anchoring arrangement 17 for holding the pulling apparatus 6 in place on the shore, which comprises a tank 18 which is to be filled with water. The tank 18 is a transportation container, the components of the system being adapted to be moved and/or transported therein. The pulling apparatus 6 comprises a water pump 19 by which the tank 19 is filled and/or emptied. The suction and discharge lines (not illustrated) of the water pump 19 for the pulling apparatus 6 are provided in connection with the body of water used as the surfing area for filling and emptying the tank 18 with the water pump 19. The tank 18 functions as a counterweight for the pulling apparatus 6, supporting the holding in place of the pulling apparatus 6. When the system is to be disassembled, all the components required for the system are moved into the emptied tank 18 and the tank 18 is used as a transportation container, so that the entire system can be moved to another place and/or for example stored for winter. This also facilitates the delivery of the system from manufacture to the buyer, as the components are already packed within a transportation- proof structure. If a ship or other watercraft (not illustrated) is the fixed place of the pulling appa^¬ ratus 6, the system may be used as if it was disposed on the shore. The difference is that the weighty ship does not necessarily require the further weight of a water-filled tank 18. From a ship or other such water- carft, the system may be operated and used as from the shore .

A floating apparatus 20 is provided in connection with the second pulley 15 for holding the second pulley 15 at the right depth. A first anchor 21a is provided in connection with the second pulley 15 and/or the float- ing apparatus 20 for anchoring the second pulley 15 and/or the floating apparatus 20 in place. Most pref^¬ erably, the floating apparatus 20 is provided with a pontoon-like structure or other similar solution, by which the floating is provided. If a ship or other wa- tercraft is used as the fixed place for the pulling apparatus 6, the ship may be steered to an island or other similar fixed place (not illustrated) within the water area. In this case, the second pulley may be taken from the ship for example to the island and fixed thereto, whereby the first anchor 21a and the floating apparatus 20 are not necessary. The pulling apparatus 6 comprises a third pulley 22, wherein the space between the first pulley 14 and the third pulley 22 is provided with drive elements 23 for obtaining the drive between the power pack 12 and the pulling arrangement 11. A number of alternative solu- tions may be used as the drive element 23. The drive element 23 is for example one or more endless ropes, wires, cables or belts provided via the third pulley 22 and the first pulley 14. The first pulley 14 and the third pulley 22 can alternatively be provided with teeth (not illustrated) for providing a chain drive between the pulleys 14, 22, in which case a chain is used as the drive element 23. In the above-described cases, the drive element 23 forms a loop via the third pulley and the first pulley. Further, the drive ele- ment 23 may alternatively be a Cardan joint for providing the drive between the first pulley 14 and the third pulley 22. By adjusting the rotation of the drive element 23, the height of the wave W can be var^¬ ied .

The system comprises a pushing apparatus 24 provided between the pulling apparatus 6 and the first pulley 14 for pushing the first pulley 14 into water to a suitable depth. The pushing apparatus 24 is a device operated from the shore and having a rigid beam-type or pole-type structure for controlling the position of the first pulley 14 in water or alternatively for holding it in place. The pushing apparatus 24 is used for adjusting the tightness of the rope or line 16. The pushing apparatus 24 adjusts the position of the first pulley 14 and the second pulley 15 relative to each other. The pushing apparatus is used to provide the first pulley 14 flush with the second pulley 15. Alternatively, the first pulley 14 may be provided on the bottom of the water area in a fixed or detachable manner so that no pushing apparatus is required. The rope or line 16 of Fig. 5 is made from floating material, whereby the rope or line 16 floats. For ex^¬ ample, the rope 16 may be made from polyethylene. Ba^¬ sically, the pulling direction is to be kept constant, and thus the rope or line 16 is most preferably float- ing. The pulling arrangement 11 is used for moving the pulled apparatus 10 in the direction of advancement A and in the opposite direction B. Since in order to form an artificial wave the pulled apparatus 10 com^¬ prising the wave-forming profile 13 is pulled in water in only one direction, after each pulling maneuver the pulled apparatus 10 must be returned to the initial position. The pulling arrangement 11 forms a rope drive for moving the pulled apparatus 10 also in the opposite direction B relative to the direction of ad- vancement A for returning the pulled apparatus 10 to the initial position. Stabilizing, i.e. balancing, the wings may be appro^¬ priate and even necessary in some cases. Examples of stabilization methods are shown in Fig. 7-9. Stabilization can be provided e.g. by a keel installed below the pulled apparatus 10 comprising the wings 1, 2. It may also be necessary to use pontoons disposed at the edges of the wings 1, 2 or, more precisely, of the pulled apparatus 10 itself. In an optimal situation, these structures are sufficient to secure the stabil- ity of the pulled apparatus 10 as it moves in water. In addition to the methods described, the stability may be improved, if necessary, for example with a rud^¬ der or other guide aerofoils (not illustrated in Fig. 5) . Such stabilizing structures may be passive or ac- tive, adjustable according to the location of swimming of the pulled apparatus 10. The pulled apparatus 10 may comprise a third wing (not illustrated in Fig. 5) and/or one or more weights (not illustrated in Fig. 5) for stabilizing the movement of the pulled apparatus 10 in water. With a suitable angular position of the wings 1, 2 and possible stabilizing structures, the wave W forming pulled apparatus 10 may be moved in a correct position and at a correct depth from the sur^¬ face S of flowing water so as to provide the desired wave formation.

The system comprises an automation and control system 25 for automatizing the operation of the system. A control center 26 is necessary for adjusting and con- trolling the system. The pulling apparatus 6 is connected under control of the automation and control system 25. As stated above, the system is provided with a suita^¬ ble automation and control system 25. The automation and control system 25 is used for starting the wave- forming pulling movement and, if necessary, for stopping the operation of the system. The control system may be manually operated and optionally provided with remote control. The operating system must also include automation by which the pulling duration and speed are adjusted. Also, the pulling direction may need to be adj usted .

Fig. 6 shows another example of a system for forming an artificial wave W in a water environment. Fig. 6 corresponds in other respects to the system shown in Fig. 5 except that the pulling apparatus 6 and the an^¬ choring arrangement 17 comprising a tank 18 are disposed on a structure 27 included in the system so as to float or be provided in and/or on water and an- chored in place. Fig. 6 shows the above-mentioned structure 27 as a pontoon-like structure. The place 27 can also be a pier that is fixed in place in or on wa^¬ ter or other similar structure bearing the load of the pulling apparatus 6 that is disposed in or on water so as to float or be fixed to the bottom of the water ar^¬ ea. The structure 27 is arranged to be held in place for example by means of a second anchor 21b. This al^¬ lows the entire system to be disposed in the water ar^¬ ea in a floating manner. If, in addition, the pulling apparatus 6 and the anchoring arrangement 17 compris^¬ ing a tank 18 are provided on a floating structure 27 that is anchored in place and the first pulley 14 is provided in connection with the pulling apparatus 6, the entire system is floating and can be easily taken to a suitable place within the water area and anchored in place for surfing.

If the structure 27 is a pier (not illustrated in Fig. 6) , it can be fixed in place for example with pillars (not illustrated in Fig. 6) disposed on the bottom of the water area or, correspondingly, by anchoring the pier by means of a second anchor 21b.

In one solution, the first pulley 14 is also arranged to float in addition to the second pulley 15, whereby the first pulley 14 is anchored to be held in place in water for example with a third anchor (not illustrated in Fig. 6) fixed to the first pulley 14 and dropped to the bottom of the water area. In Fig. 6, the first pulley is fixed to the floating structure 27 that is anchored in place with a pushing apparatus 24 provided between the pulling apparatus 6 and the first pulley.

Fig. 7 shows one possible solution of an apparatus 10b pulled in water. As described above, the pulled appa^¬ ratus 10b may comprise stabilizing structures to se- cure the stability of the pulled apparatus 10b as it moves in water. The pulled apparatus 10b of Fig. 7 comprises weights and/or floats 28a, 28b that contrib^¬ ute to the balance of the pulled apparatus 10b. If floats 28a, 28b are used, they can be arranged for ex- ample to float near surface. In this case, it must be secured that the floats 28a, 28b do not disturb surf^¬ ing too much. Alternatively, the pulled apparatus 10b may comprise for example sand-filled weights (not il^¬ lustrated in Fig. 7) fixed to or hanging from the sides of the pulled apparatus for stabilizing the movement of the pulled apparatus 10b in water. The stabilizing structure may be a passive structure such as an aerofoil 36. One example of an aerofoil 36 is illustrated in Fig. 7. The aerofoil 36 can be in^¬ stalled for example behind the second wing 2 of the pulled apparatus 10b to guide the travel of the appa- ratus 10b. The aerofoil 36 may alternatively be ad^¬ justable with a separate adjusting element (not illus^¬ trated in Fig. 7) or its position may be manually ad^¬ justed by changing the fixing points. Fig. 8 shows one possible solution of an apparatus 10c pulled in water. Stabilization may be provided for example with a keel 29 installed below the pulled appa^¬ ratus 10c comprising the wings 1, 2. The keel may be shaped for example to be spindle-like or alternatively as a fin or their combination.

Fig. 9 shows one possible solution of an apparatus lOd pulled in water. In addition to the methods described above, such as weights, wings and a keel, the stabil- ity may be improved, if necessary, for example by means of a rudder 30 or other guide aerofoils. Such stabilizing structures may be passive or active, ad^¬ justable according to the location of swimming of the pulled apparatus lOd. Passive wings may be fixed or manually adjustable as shown in Fig. 7. The rudder 30 may be controlled from example by means of an actuator 32. The rudder 30 is coupled to the pivoting points 31a, 31b of the pulling apparatus lOd in a hinged man^¬ ner. As the rudder 30 is moved by the actuator 32 in the directions of a first arrow 34, the rudder 30 can be turned according to a second arrow 33. The control of the actuator can be provided for example with re^¬ mote control 35. One possible way of remote control may be radio control. In this case, for example an an^¬ tenna that extends near the water surface may be used. Fig. 10 schematically shows one example of the system. In the example of Fig. 10, the system comprises two pulling apparatuses 6, 6a which are positioned at each end of the pulling arrangement 11. One pulling appa^¬ ratus 6b can be used for example to control the tight- ness of the rope or line 16 and to hold it at a suita^¬ ble depth, whereby for example floating apparatuses and/or weights are not required for fixing the pulling arrangement 11. Said system may be placed in a suita^¬ ble water environment such as a small lake, a deep pond or even in a man-made place such as a harbor ba^¬ sin .

Fig. 11 schematically shows one example of the system. The system shown in Fig. 11 differs from the system according to Fig. 5 in that pulleys as such are not necessarily required in the system of Fig. 11. The pulling apparatuses 6b, 6c are provided on each side of a suitably sized water area. The pulling apparatus^¬ es 6b, 6c are disposed on a level below the water sur- face at a suitable depth, whereby wave formation is possible without pulleys. As a first pulling apparatus 6b feeds the rope or line 16, a second pulling appa- ratus 6c receives it, whereby the rope or line 16 pro^¬ vides the movement of the pulled apparatus 10 between the first pulling apparatus 6b and the second pulling apparatus 6c. The wave-forming profile 13 comprises at least two wings 1, 2, of which at least one wing 1 is mainly transverse relative to the direction of ad^¬ vancement A, B of the pulled apparatus 10.

In all of the examples described above, the position and/or traveling depth of the pulled apparatus 10, 10a, 10b, 10c, lOd may also be controlled by adjusting the pulling speed of the pulled apparatus 10, 10a, 10b, 10c, lOd. The pulled apparatus may contain structures from a number of examples of the pulled apparatus 10, 10a, 10b, 10c, lOd as described. The pulled apparatus 10, 10a, 10b, 10c, lOd may for example comprise a number of different stabilizing structures. With a suitable angular position of the wings 1, 2 and possible stabi^¬ lizing structures, the wave W forming pulled apparatus 10, 10a, 10b, 10c, lOd can be moved in a right posi^¬ tion and at a right depth from the surface S of flow^¬ ing water so as to provide a desired height of the wave W.

The functions described above are not exclusively lim^¬ ited to surfing; the applications may also include other cases where a controllable artificial wave W is to be provided. Other forms of physical activity which are not specifically surfing but are closely related to it, such as bodyboarding, can also be performed on top of a wave W. Furthermore, it may be possible to use the system for surfing with equipment which is not necessarily actual surfing equipment. Fig. 3 and 4 show two different ways of attaching and securing the wings to the frame structure. However, these are only examples which can be deviated from. The essential feature is that the wings can be posi^¬ tioned in a desired and specific way relative to each other e.g. in terms of distances and angles. The posi^¬ tioning of the wings may be static or adjustable.

The invention has been described above mainly with the formation of a wave being based on an idea of pulling the pulled apparatus 10 from a fixed place that car^¬ ries the pulling apparatus 6, such as a shore, a wa- tercraft or a floating structure 27 that has been an^¬ chored in place. When placing the pulling apparatus 6 near shoreline, it can be disposed for example right at the water's edge. However, suitable distances from the water' s edge may vary according to the operating area .

The system has been exemplified above with reference to the accompanying figures. However, the scope of protection of the invention is not limited merely to the examples illustrated in the figures; instead, the embodiments of the invention may vary within the scope of the inventive idea defined in the accompanying claims.

Claims

A system for forming an artificial wave (W) in a water environment, which comprises a pulling apparatus (6), a pulled apparatus

(10, 10a, 10b, 10c, lOd) and a pulling ar^¬ rangement (11), wherein the pulling apparatus

(6) comprises a power pack (12) and the pulled apparatus (10, 10a, 10b, 10c, lOd) comprises a wave-forming profile (13), where^¬ in the pulling arrangement (11) comprises at least two pulleys (14, 15) and at least one rope or line (16) provided substantially at or via both ends of the pulled apparatus (10, 10a, 10b, 10c, lOd) and further via the pul^¬ leys (14, 15) for providing the movement of the pulled apparatus (10, 10a, 10b, 10c, lOd) between a first pulley (14) and a second pul^¬ ley (15), characterized in that the wave- forming profile (13) comprises at least two wings (1, 2), of which at least one wing (1, 2) is mainly transverse relative to the direction of advancement (A) of the pulled ap^¬ paratus (10, 10a, 10b, 10c, lOd) .

The system according to claim 1, characterized in that the rope or line (16) is endless and/or forms a loop via the first pulley (14) and the second pulley (15) .

The system according to claim 1 or 2, characterized in that the pulling apparatus (6) is provided on a shore.

4. The system according to claim 1 or 2, charac- terized in that the pulling apparatus (6) is provided on a ship, a vessel, a barge or oth^¬ er watercraft.

The system according to claim 1 or 2, characterized in that the system comprises a struc^¬ ture (27) that floats or that is disposed in and/or on water and anchored in place for providing the pulling apparatus (6) thereon.

The system according to claim 3, characterized in that the system comprises an anchor^¬ ing arrangement (17) for holding the pulling apparatus (6) in place on the shore, which comprises a tank (18) which is to be filled with water.

The system according to claim 6, characterized in that the tank (18) is a transporta^¬ tion container in which the components of the system are adapted to be moved and/or trans^¬ ported .

The system according to claim 6 or 7, characterized in that the pulling apparatus (6) comprises a water pump (19) by which the tank (18) is filled and/or emptied.

The system according to any preceding claim 1-8, characterized in that the wings (1, 2) are positionable relative to each other and to the direction of advancement (A) of the pulled apparatus (10, 10a, 10b, 10c, lOd) for adjusting the movement and/or floating characteristics of the pulled apparatus (10, 10a, 10b, 10c, lOd) . The system according to any preceding claim 1-9, characterized in that the wings (1, 2) are positionable relative to each other in terms of distances (d) and angles ( , β), as well as in terms of the transverse direction relative to the distance between the wings and of the water surface (S) .

The system according to any preceding claim 1-10, characterized in that a floating appa^¬ ratus (20) is provided in connection with the second pulley (15) for holding the second pulley (15) at a correct depth. 12. The system according to claim 11, characterized in that a first anchor (21a) is provided in connection with the second pulley (15) and/or the floating apparatus (20) for anchoring the second pulley (15) and/or the floating apparatus (20) in place.

The system according to any preceding claim 1-12, characterized in that the pulling appa^¬ ratus (6) comprises a third pulley (22), wherein the space between the first pulley

(14) and the third pulley (22) is provided with drive elements (23) for providing the drive between the power pack (12) and the pulling arrangement (11) .

The system according to claim 13, characterized in that the drive element (23) is one or more endless ropes, wires, cables, belts or chains provided via the third pulley (22) and the first pulley (14) .

15. The system according to any preceding claim 1-14, characterized in that the rope or line (16) comprises floating material.

The system according to any preceding claim 1-15, characterized in that the system com^¬ prises a pushing apparatus (24) provided be^¬ tween the pulling apparatus (6) and the first pulley (14) for pushing the first pulley (14) into water to a suitable depth.

The system according to any preceding claim 1-16, characterized in that the wave (W) is formed by a combined effect of the wings (1, 2), whereby at least one of the wings (1, 2) of the pulled apparatus is provided in such a way that, as the pulled apparatus (10, 10a, 10b, 10c, lOd) moves, it guides the flow of water in a downward direction to form a trough (Wi) for the wave, and whereby at least one other second wing (1, 2) of the pulled apparatus (10, 10a, 10b, 10c, lOd) following the wing (1, 2) that guides the flow in a downward direction is arranged to guide the water flow in an upward direction to enhance the movement of water that flows back up to form (W) a crest (W₂) for the wave.

The system according to any preceding claim 1-17, characterized in that the pulled appa^¬ ratus (lOd) comprises actively adjustable (30) and/or fixed aerofoils (36) that guide the travel of the pulled apparatus. 19. The system according to any preceding claim

1-18, characterized in that the pulled appa- ratus (10b) comprises weights and/or floats (28a, 28b) that contribute to the balance of the pulled apparatus (10b).

The system according to any preceding claim 1-19, characterized in that the pulled appa^¬ ratus (10c) comprises a keel (29) installed below the pulled apparatus (10c) for balanc^¬ ing the pulled apparatus (10c) .

The system according to any preceding claim 1-20, characterized in that the position and/or traveling depth of the pulled apparatus (10, 10a, 10b, 10c, lOd) are controlled by adjusting the pulling speed of the pulled apparatus (10, 10a, 10b, 10c, lOd) .

The system according to any preceding claim 1-21, characterized in that the system com^¬ prises at least two pulling apparatuses (6, 6a) positioned at each end of the pulling ar^¬ rangement (11) .

A system for forming an artificial wave (W) in a water environment, characterized in that the system for forming an artificial wave (W) comprises a pulled apparatus (10, 10a, 10b, 10c, lOd) , at least a first pulling apparatus (6b) and a second pulling apparatus (6c), each pulling apparatus (6b, 6c) comprising a power pack (12) and the pulled apparatus (10, 10a, 10b, 10c, lOd) comprising a wave-forming profile (13), wherein at least one rope or line (16) coupled to the first pulling appa^¬ ratus (6b) and to the second pulling appa^¬ ratus (6c) is provided substantially at or via both ends of the pulled apparatus (10, 10a, 10b, 10c, lOd) for providing the move^¬ ment of the pulled apparatus (10, 10a, 10b, 10c, lOd) between the first pulling apparatus (6b) and the second pulling apparatus (6c), wherein the wave-forming profile (13) comprises at least two wings (1, 2), of which at least one wing (1, 2) is mainly transverse relative to the direction of advancement (A, B) of the pulled apparatus (10, 10a, 10b, 10c, lOd) .