![]() ![]() The above formula also says that wave power is proportional to the wave period and to the square of the wave height. Where P is the wave energy flux per unit of wave-crest length, Hm0 the significant wave height, T the wave period, ρ the water density and g the acceleration by gravity. In deep water where the water depth is larger than half the wavelength, the wave power is found using the following equation: In this case, the ‘power ’ does not refer to the power that would be produced by a wave power machine, rather it means the ‘wave energy flux ’, or the transport rate of wave energy. The power of a wave is determined by the ‘Wave Power Formula ’. In general, larger waves are more powerful but wave power is also determined by wave speed, wavelength, and water density. For very small waves surface tension can flatten waves. Waves are destroyed mainly by gravity or ‘breaking ’ on land. ![]() When this limit has been reached the sea is said to be "fully developed”. Given wind speed has a matching practical limit over which time or distance will not produce larger waves. The wave height is determined by wind speed, how long the wind has been blowing, the fetch (the distance over which the wind excites the waves) and by the depth and surface of the seafloor (which can focus or disperse the energy of the waves). Low pressure behind wave also contributes to forward motion. If the wind is continuous the wave period and height grow together. More Accurate Prediction of Wave Conditions within Wave Energy Test Sites.Lockheed Martin Signs Contract with Victorian Wave Partners to Develop Wave Energy Project.Fortum Signs Leasing Agreement with Wave Hub to Test Wave Power Solutions.As long as the waves move forward slower than the wind speed just above the waves, energy moves from the wind to the waves. The water molecules collide with each other and so start moving forward. This causes water molecules on the surface to move in the same direction as the wind. The wind attempts to ‘stretch ’ the surface of the sea by rubbing against the surface of the water. Landslides and other Earth movements (tectonic movement) can also create waves, demonstrated with catastrophic effect by the Japanese Tsunami of 2011. Waves are generally generated by wind passing over the surface of the sea, but can also form via atmospheric pressure and gravitational attraction. Steepness: The ratio of height to width.Velocity: Speed with which the waves are moving past a fixed point.Frequency: Number of waves per second that pass a fixed point.Period: Time taken for one wave to pass a fixed point.Height: Difference between trough and crest. ![]() Peak or Crest: The highest point of a wave. ![]()
0 Comments
Leave a Reply. |