CHAPTER 8 Waves and Water Dynamics. Waves are visual proof of the transmission of energy across the ocean. Origin of waves. Most waves are wind-driven Moving energy along ocean/air interface Wind main disturbing force Boundary between and within fluids with different densities
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Atmospheric Kelvin-Helmholtz waves are caused when a certain type of cloud moving horizontally one way interacts with a stream of air moving horizontally at a different speed. Eddies develop, making beautiful, unusual, curling waves of cloud.
Internal waves (wavelength about 2 km) which seem to move from theAtlantic ocean to the Mediterranean Sea, at the east of Gibraltar and Ceuta
Global wind speed (Oct 3-12, 1992)
Global wave height (Oct 3-12, 1992)
Rogue waves that rise as high as 10-story buildings and can sink large ships are far more common than previously thought, imagery from European Space Agency satellites has shown. A rogue wave is seen in this rare 1980 photo taken aboard a supertanker during a storm near Durban, South Africa. (Reuters)
About 10 m high
Area of destructive interference
Area of constructive interference (set)
Area of destructive interference (lull)
Undersea earth-quake at 6:59 AM
Landsat image before tsunami: 13-Dec. 2004
** Note sediment covered area impacted by tsunami 1-5 km inshore
Landsat image after tsunami: 29-Dec. 2004