Patent ID: 7930774

Claim:
A method for creating a motion selected from the group consisting of liquid motions in a liquid, liquid motions at the surface of a liquid and combinations thereof, said liquid contained in a pool presenting an average level, said liquid motion following at least one substantially sinusoidal pattern having a phase and with a height varying between a bottom level below the average level at specific moments and a top level above the average level at specific other moments, said method comprising the step of: introducing intermittently a gas into the liquid by means comprising at least one end piping assembly with a total open end cross section of at least 2 cm 2 , each end piping assembly having a gas flow rate of less than 200 liters per second, whereby the gas is submitted to a pressure corresponding to the liquid height from the end opening up to the surface of the liquid, increasing the pressure of the gas by a gas flow means, said increase resulting in a gas flow at the end opening of the end piping assembly up to a pressure greater than the pressure corresponding to the sum of the liquid height form the end opening of the end piping assembly to the surface of the liquid with an additional liquid height of at least 5 cm, but lower than a pressure corresponding to the sum of the liquid height from the end opening of the end piping assembly and an additional liquid height of 5 meters, and controlling by a control means the flow of the gas at the end opening of the end piping assembly at least in function of the height of the liquid vertically above the end opening, said control means being adapted for achieving, said at least one pattern, to permit the gas flow means to increase the pressure of the gas, said increase resulting in gas flow in said end piping assembly at first moments for which the wave above the open end assembly is in phase corresponding to an advance of phase comprised between 0° and 180° with respect to moments of low level of the phase of the liquid motion, up to a pressure greater than the pressure corresponding to the sum of the liquid height from the end opening of the end piping assembly to the surface of the liquid with an additional liquid height of at least 5 cm, but lower than a pressure corresponding to the sum of the liquid height from the end opening of the end piping assembly to the surface of the liquid with an additional liquid height of 5 meters, while said control means is adapted for maintaining the pressure in the end piping assembly at or slightly below a pressure corresponding to the liquid height above the end piping assembly for the liquid motion phases except the said first moments.