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TIDES

TIDES. Definition. Tides = periodic rise and fall of large bodies of water. Caused by the gravitational interactions between the Earth and the Moon and the Sun. Lunar Tides. The Moon tries to pull on Earth to bring it closer. The Earth is able to hold onto everything but the water

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TIDES

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  1. TIDES

  2. Definition • Tides = periodic rise and fall of large bodies of water

  3. Caused by the gravitational interactions between the Earth and the Moon and the Sun

  4. Lunar Tides • The Moon tries to pull on Earth to bring it closer. The Earth is able to hold onto everything but the water • The oceans bulge out in the direction of the moon

  5. Another bulge occurs on the opposite side. • Two tides occur each day. About 12hr and 25min between two high tides.

  6. Complicating Factors • The Earth and Moon are not static. • The Earth is not covered in oceans. • The oceans are of varying depths • Friction between the oceans and the Earth

  7. Effect of the Sun • Other objects influence the Earth’s tides. • The effect of the Sun is about half that of the Moon. • Particularly large tides are experienced when the Earth, Moon and Sun line up.

  8. SPRING TIDES: Highest tides. During full and new moon. • NEAP TIDES: Weaker tides. During first and third quarter

  9. Tides in the Bay of Fundy

  10. Hopewell Rocks

  11. The Tidal Bore • The leading edge of the incoming tide forms a wave of water that travels up a river or narrow bay against the direction of the current.

  12. Standing Waves • A wave that remains in a constant position. • The medium is moving in the opposite direction to the wave.

  13. The Annapolis Tidal Generating Station • Uses the massive movements of the water in the Bay of Fundy • Creates enough energy to power 5000 homes. • The only tidal power station in North America

  14. Earth’s Rotation • Tidal interactions have slowed Earth’s rotational period. • Eventually (billions of years) Earth and Moon will have the same rotational period (27.3 days)

  15. Evolution

  16. Resources • http://www.lcsd.gov.hk/CE/Museum/Space/EducationResource/Universe/framed_e/lecture/ch06/imgs/tides.jpg • http://www.enchantedlearning.com/subjects/astronomy/moon/Tides.shtml • http://www.jochemnet.de/fiu/tide2.jpg • http://home.hiwaay.net/~krcool/Astro/moon/moontides/ • http://www.physicalgeography.net/fundamentals/images/earth_moon.jpg • http://photoclub.canadiangeographic.ca/photos/rosco-photo/images/43243/500x335.aspx • http://static.howstuffworks.com/gif/ocean-current-6b.jpg • http://www.huntsmanmarine.ca/images/tides_1rd.jpg • http://upload.wikimedia.org/wikipedia/commons/5/54/Bay_of_Fundy.jpg • http://www.canadacool.com/COOLFACTS/NOVA%20SCOTIA/NOVASCOTIAPHOTOS/annapolis7low.jpg • http://www.intute.ac.uk/sciences/worldguide/satellite/2559.jpg • http://www.srh.noaa.gov/jetstream/ocean/images/bayoffundy.jpg • http://www.raftingcanada.ca/ • http://cord.org/cm/leot/course01_mod07/loet01-07-06new.gif • http://www.canada-maps.org/nova-scotia-map.htm • http://grant7.typepad.com/trilogy/images/tidal%20pool.bmp • http://www.zoology.ufl.edu/personal/grad/jhavird/Picture/killifish-pics-(1)-(optimal).jpg • http://www.ucmp.berkeley.edu/vertebrates/sarco/lungfish1.jpg • http://csep10.phys.utk.edu/astr161/lect/time/tides.html • http://csep10.phys.utk.edu/astr161/lect/time/tides.html • http://en.wikipedia.org/wiki/Tidal_bore • http://www.physicalgeography.net/fundamentals/images/earth_rotation.jpg • http://www.michaeltaylor.ca/Culture/hopewell-low.jpg • http://thomonthenet.com/Maritimes2002/123a.jpg

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