CoastalProcesses - Coastal Processes The Oceans The...

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The Oceans The Oceans Steve Terrill/Stock Market Coastal Processes Currents, tides & waves at work
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Coastal Processes Currents Tides Ocean Waves Coral Growth These processes result in: modification of the coast sediments and sedimentary rocks a record of sea level change in Hawaii
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SEAWATER SEAWATER Covers 71% of Earth’s surface Covers 71% of Earth’s surface Nature of seawater Nature of seawater 35o/oo dissolved salts (30-40) Origin of seawater Origin of seawater Volcanoes Comets? Excess H + & O - ?
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Average surface salinity of the oceans
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I. I. CURRENTS CURRENTS Ocean water moves constantly - sideways, up, down because it is: Heated unevenly Evaporated unevenly Blown by wind Affected by Earth’s rotation Currents are the flow of water between areas of different surface levels or different different surface levels or different densities densities
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Density Currents Density Currents Function of Function of Temperature (polar regions) Salinity (Mediterranean Sea) Suspended materials (turbidities- flow of muddy water down a slope) Deep ocean currents move by Deep ocean currents move by density & thermal differences the Coriolis effect NADW (North Atlantic Deep Water) NADW (North Atlantic Deep Water) AABW ( Antarctic Bottom Water) AABW ( Antarctic Bottom Water)
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Surface ocean currents are run by climate & rotation
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August sea-surface temperatures
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Circulation of the Atlantic Ocean Circulation of the Atlantic Ocean
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Turbidity Currents
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Sandfall at the Head of a Submarine Canyon U.S. Navy
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Tides Gravitational attraction of the moon and sun raises sea level Function of distance between and mass of distance between and mass of the Earth, Moon and Sun (which is stronger?) We have a twice daily cycle of high tides and low tides (why?) As moon orbits the earth, it changes the amplitude (size) of the tide highest when moon and sun are aligned lowest when moon and sun at right angles The movement of the tides moves the zone where waves act on the coast
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The highest and lowest tides occur due to the interaction of earth, moon, and sun
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a predictive tide chart
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The effect of tides on a tidal inlet .
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Exposed tidal flats Mont-Saint-Michel France Thierry Prat/Sygma
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This note was uploaded on 04/20/2011 for the course GG 103 taught by Professor Herrero-bervera during the Summer '10 term at University of Hawaii, Manoa.

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CoastalProcesses - Coastal Processes The Oceans The...

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