1 / 28

Tides

Tides. CH 8. Hilo (new moon): time to deep sea fish. Kū phases: were good for fishing ‘Ole phases: were not because they were associated with rough water Fishing was also good approaching the full moon and a few days after and the waning of the old moon to new moon, Muku.

nassor
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 CH 8

  2. Hilo (new moon): time to deep sea fish. • Kū phases: were good for fishing • ‘Ole phases: were not because they were associated with rough water • Fishing was also good approaching the full moon and a few days after and the waning of the old moon to new moon, Muku.

  3. Tides are generated by: • Gravitational pull of the moon and sun • Centripetal force of the rotating Earth TIDES: https://www.youtube.com/watch?v=3RdkXs8BibE&feature=youtu.be

  4. Tides are generated by: • the gravitational pull of the moon and sun • - moon has 2x greater gravitational pull than the • sun

  5. Centripetal force

  6. Lunar Phases

  7. Tidal Cycle Tides and Current Predictions: https://tidesandcurrents.noaa.gov/noaatidepredictions.html?id=1612340&legacy=1

  8. Table 8.2 Tidal Definitions

  9. Beach Zonation Put beach towel here

  10. Mole Crab Ghost Crab

  11. The monthly tidal cycle(29½ days) About every 7 days, Earth alternates between: • Spring tide • Alignment of Earth-Moon-Sun system (syzygy) • Lunar and solar bulges constructively interfere • Large tidal range • Neap tide • Earth-Moon-Sun system at right angles (quadrature) • Lunar and solar bulges destructively interfere • Small tidal range

  12. Diurnal or Semidiurnal? Ave. sea level Low tide 12 am 6:12 am 6:12 pm 12:25 pm 12:50 am

  13. Tidal Patterns Semidiurnal tides- two high and two low per day; Cape Cod, MA (high latitudes) Diurnal tides- one high and one low per day; Mobile, AL (low latitudes) Mixed pattern tides- Two high and two low tides per day BUT with successive high tide levels that are VERY DIFFERENT from each other; Hawaii (mid latitudes) • Type of tide depends on: • Position on the globe • Water depth • Contour- shape of ocean basins

  14. Location of Tide Types World Map

  15. Earth-Moon-Sun positions and the monthly tidal cycle Spring Tide Highest high tide and lowest low tide Neap Tide Moderate tidal range

  16. Tidal House

  17. The Bay of Fundy: Site of the world’s largest tidal range

  18. Bay of Fundy Alma at Low Tide Alma at High Tide

  19. Tidal bore = a true tidal wave • Wall of water that moves upriver • Caused by an incoming high tide • Occurs in some low-lying rivers • Can be large enough to surf or raft

  20. Surfing Gironde River tidal bore, Francehttp://news.khmeread.com/?p=17326

  21. Hangzhou tidal bore Qiantang River, China   Pacific Ocean China https://www.youtube.com/watch?v=k6fr6GUSmAA

  22. What are King Tides? June 2017

  23. Tidal Energy La Rance River and Tidal Power Station, France

  24. La Rance tidal power plant at St. Malo, France.

More Related