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in aqua parks how do wave generators work?
im doing this science project and i need to know how wave generators (wave creators) work... im in grade 8 (year 9) so plz help or you can just send me a link 
Wave pools replicate the movement of the ocean one of two ways, depending on the size of the pool and the size of wave desired. In small wave pools, pressurized air is blown onto the surface of the water, or a paddle creates force in the water, creating small ripple-like waves. Other techniques utilize an "accordion mechanism" which opens and closes in order to suck water into its belly (opening) and push it out (closing) to cause waves. However, in high-volume wave pools, a large amount of water is quickly allowed into the far end of the pool, forcing the water to even out, generating a sizeable wave. In these large wave pools, the excess water is removed by being channeled through a return canal where it can be used again to generate another wave.
There are very simple principles behind wave generators. In almost all designs a hydraulic pump is used to open and shut the valves. In the wind based wave maker, the most complex piece of technology is the high speed fan that pushes the surface of the water creating the wave. In the wave generator with a water reservoir however, slightly more technical elements are used. The water pump pulls up water and drops it into the reservoir. The valve is opened with a hydraulic pump and is swung on a pivot using a weight at the bottom to help keep the valve closed. There is no high tech component in the design of artificial wave generator. The computer that controls the machine however is very elaborate. It keeps track of the entire system (valves, water level, water pressure, etc.) in order to ensure safe performance.
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