• Like
Tides
Upcoming SlideShare
Loading in...5
×
Uploaded on

 

More in: Education , Technology
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
180
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
15
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. CHAPTER 9Tides © 2011 Pearson Education, Inc.
  • 2. Chapter OverviewTides are the rhythmic rise and fall of sea level.Tides are very long and regular shallow-water wavesTides are caused by gravitational attraction of the Sun, Moon, and Earth © 2011 Pearson Education, Inc.
  • 3. What are Tides?Tides – periodic raising and lowering of ocean sea levelOccurs dailyCaused by combination of gravity and motion between Earth, Moon, and SunIsaac Newton’s gravitational laws explain relationship © 2011 Pearson Education, Inc.
  • 4. Tide-Generating ForcesBarycenter between Moon and Earth Common center of mass or balance point Beneath Earth’s surface because of Earth’s greater mass © 2011 Pearson Education, Inc.
  • 5. Gravitational ForcesEvery particle attracts every other particleGravitational force proportional to product of masses Increase mass, increase force © 2011 Pearson Education, Inc.
  • 6. Centripetal ForceCenter-seeking forceTethers Earth and Moon to each other © 2011 Pearson Education, Inc.
  • 7. Resultant ForcesMathematical difference between gravitational and centripetal forcesRelatively small © 2011 Pearson Education, Inc.
  • 8. Tide-Generating ForcesResultant force has significant horizontal componentPushes water into two simultaneous bulges One toward Moon One away from Moon © 2011 Pearson Education, Inc.
  • 9. Tidal PhenomenaTidal period – time between high tidesLunar day Time between two successive overhead moons 24 hours, 50 minutesMoon orbits EarthHigh tides are 12 hours and 25 minutes apart © 2011 Pearson Education, Inc.
  • 10. Tidal Bulges – Sun’s EffectSimilar to lunar bulges but much smallerMoon closer to Earth © 2011 Pearson Education, Inc.
  • 11. Earth’s Rotation and TidesFlood tide – water moves toward shoreEbb tide – water moves away from shore Earth’s rotation moves different geographic locations into bulges © 2011 Pearson Education, Inc.
  • 12. Monthly Tidal CycleSpring tides New or full moons Tidal range greatestNeap tides Quarter moons Tidal range least © 2011 Pearson Education, Inc.
  • 13. Earth, Moon, and Sun Positions Relative toSpring and Neap Tides © 2011 Pearson Education, Inc.
  • 14. Idealized Tide PredictionTwo high tides/two low tides per lunar daySix lunar hours between high and low tides © 2011 Pearson Education, Inc.
  • 15. Real TidesContinents and friction with seafloor modify tidal bulgesTides are shallow-water waves with speed determined by depth of water © 2011 Pearson Education, Inc.
  • 16. Tidal PatternsDiurnal One high tide/one low tide per daySemidiurnal Two high tides/two low tides per day Tidal range about sameMixed Two high tides (1 higher than the other)/two low tides (1 lower than the other) per day Tidal range different Most common © 2011 Pearson Education, Inc.
  • 17. Tidal Patterns © 2011 Pearson Education, Inc.
  • 18. Monthly Tidal Curves © 2011 Pearson Education, Inc.
  • 19. Tides in Coastal WatersStanding Waves Tide waves reflected by coast Amplification of tidal range Example: Bay of Fundy maximum tidal range 17 meters (56 feet) © 2011 Pearson Education, Inc.
  • 20. Bay of Fundy – World’s Largest Tidal Range © 2011 Pearson Education, Inc.
  • 21. Tides in Coastal WatersTidal Bores Wall of water Moves up certain rivers Tide-generated © 2011 Pearson Education, Inc.
  • 22. Coastal Tidal CurrentsWhirlpool Rapidly spinning seawater Restricted channel connecting two basins with different tidal cycles © 2011 Pearson Education, Inc.
  • 23. Moon and Tides