1 / 31

Tides

Tides. By Alanis Gardiner . How Do Tides Work?. Tides are caused by the gravitational pull of the moon and sun. The moon is much closer so the pull is twice as strong. As the moon moves around the earth, it creates bulges of water which follow it’s movements, creating a tide. Earth.

verity
Download Presentation

Tides

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Tides By Alanis Gardiner

  2. How Do Tides Work? Tides are caused by the gravitational pull of the moon and sun. The moon is much closer so the pull is twice as strong. As the moon moves around the earth, it creates bulges of water which follow it’s movements, creating a tide.

  3. Earth Tidal Bulge SPRING TIDES A Spring Tide occurs when the Sun, Earth and Moon, are in line. It produces a very wide tidal range.

  4. NEAP TIDES Neap Tides occurs when the Sun and Moon are at right angles. These produce smaller high and low tides than Spring tides do.

  5. Tides are important in shaping the coast. Two high tides and two low tides occur each day. The time of these events changes because of the difference between a lunar day and that of a solar day.

  6. Shoreline moves with the waves. Movement of the shoreline from high tide to low tide is called the Ebb tide. Movement of the shoreline from low to high tide is Flood tide.

  7. The tidal range is the difference between the ocean levels at low tide and the ocean levels at high tide. Some tides have a greater tidal range than others. High Tide Tidal Range Low Tide

  8. High Tide Tidal Range Low Tide The difference between high tide and low tide is smaller during Neap tides. They occur during the first and last quarters of the moon phases. The most extreme tidal range occurs the time of the full or new moons (Spring Tides)

  9. High Tide Tidal Range Tides often determine the range over which sediment is deposited or eroded. Areas with high tidal ranges allow waves to reach further up the shore. (S.C.O.T) Low Tide

  10. High Tide Tidal Range Low Tide

  11. King Tides (High tides) King Tides refer to any high tide well above average height. King tides occur: -Naturally and regularly -Are predicted -Not an every day occurrence

  12. How do tides change the landscape? Backshore Foreshore High Tide Berm Low Tide

  13. Backshore Foreshore Dunes High Tide Berm Berm is created by action of waves and tides Low Tide Day to day

  14. Coasts and shores are constantly changing! (Day to day) Rock is eroded away.. Backshore Foreshore (Long term change) Gravel and sand are deposited on shore... Only to be swept back off shore... (Day to day) High Tide Berm Low Tide

  15. (The foreshore zone is the area between the ordinary low tide mark and high tide mark.) Backshore Foreshore High Tide Berm Low Tide

  16. Long term Landforms created by deposition Tides actually have their own effect on forming these landforms: Wave activity (tides) keep sand and other sediments in constant motion. From this, it creates coastal features such as: -Spits -Sandbars -Barrier islands -Mudflats -(Sand dunes are also formed) These landforms are formed mostly when sediments are carried by waves and are deposited on shore. (movement of water and sand, and S.C.O.T)

  17. Location

  18. Distance from the location

  19. Times of the high waters Times of the low waters

  20. Visually this chart shows the rise and the fall of the tide. In the white areas are day light, the grey areas are at night.

  21. Bibliography 1. http://pubs.usgs.gov/circ/c1075/change.html (Accessed on the 27th of February) 2. http://www.tulane.edu/~sanelson/geol204/coastalzones.htm (Accessed on the 27th of February) 3. http://en.wikibooks.org/wiki/High_School_Earth_Science/Ocean_Movements (Accessed on the 28th of February) 4. http://home.hiwaay.net/~krcool/Astro/moon/moontides/ (Accessed on the 28th of February) 5. http://www.crd.bc.ca/watersheds/protection/geology-processes/tides.htm (Accessed on the 29th of February) 6. http://uregina.ca/~sauchyn/geog323/coastal.html (Accessed on the 3rd of March) 7. http://www.lobstermanspage.net/tides/currents.html (Accessed on the 3rd of March)

  22. 8. http://en.wikibooks.org/wiki/High_School_Earth_Science/Ocean_Movements (Accessed on the 3rd of March) 9. http://epa.tas.gov.au/coastal/physical-factors-that-shape-the-coast (Accessed on the 6th of March) 10. http://www.factmonster.com/dk/encyclopedia/coasts.html (Accessed on the 6th of March) 11. http://en.wikipedia.org/wiki/Coast (Accessed on the 6th of March) 12.http://www.marinebio.net/marinescience/03ecology/sbprocesses.htm (Accessed on the 12th of March) 13. http://www.youtube.com/watch?v=Ay5uHttkmPw (Accessed on the 13th of March)

More Related