Lecture 20-23 Waves

# Or l 15m and 15s period17mw per m of wave front235m

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Unformatted text preview: icked into the sea comes back…. 9 Fundamentals……. 10 l༆  Period = Hme for one full wave to pass Summary of 5 Wave Types 11 Power CalculaHon (for fun only) l༆  Power is proporHonal to the period and the square of the height P = (ρg2/64π)H2T Typical ocean swell of 3m and period of 8s P (kW) ≈0.5 x H2 x T Gives 36kW per m of wave front – compares to 216m2 of solar PV modules l༆  Take 400MW gas plant in the Portlands…..equivalent to 22km of wave barriers @ 50% conversion eﬃciency…. or l༆  15m and 15s period….1.7MW per m of wave front…235m meets 400MW l༆  hMp://www.youtube.com/watch? v=oNpH5tx4Pu8&feature=results_main&playnext=1&list=PLBEE096AE370615B D 12 What Makes Waves? l༆  A DISTURBING FORCE is required to start a wave l༆  A RESTORING FORCE tries to stop a wave l༆  Wind is the typical disturbing force of an ocean (wind) wave l༆  Gravity is the restoring force, but oscillaHon results in wave conHnuaHon l༆  FricHon will always act - rotaHonal speed of Earth is slowing down by an average of 1.4 milliseconds each century (only partly due to Hdes) 13 5 Types of Waves l༆  Capillary waves l༆  Gravity/wind waves l༆  Seiche waves l༆  Tsunami waves l༆  Tides (note not “Hdal waves”) 14 1. Capillary Waves l༆  Wind is the disturbing force, pushing the water up via fricHon l༆  The RESTORING FORCE is capillary acHon – hydrogen bonds between adjacent water molecules hence a capillary wave l༆  Capillary waves have a wavelength of < 1.73cm l༆  They are almost ALWAYS present on the wate...
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