Rhythmic Blueprints: A tutorial on Design and Evaluation of Rhythmic Interaction
Tides. What are they? The rhythmic rising and falling of ocean surface levels.
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Transcript of Tides. What are they? The rhythmic rising and falling of ocean surface levels.
![Page 1: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/1.jpg)
Tides
![Page 2: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/2.jpg)
What are they?
• The rhythmic rising and falling of ocean surface levels.
![Page 3: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/3.jpg)
Why study them?
• Affect the coastline• Affect the life of marine organisms in tidal
areas• Raise and lower sea level• Affect lives of people • Drive circulation in bays and estuaries
![Page 4: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/4.jpg)
What causes tides?
1. Gravitational pull of the sun and moon on the Earth
![Page 5: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/5.jpg)
1. Gravitational Pull
• Moon pulls water on earth’s surface wherever it faces earth causing a bulge.
![Page 6: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/6.jpg)
Result looks something like this:
![Page 7: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/7.jpg)
most places on earth have 2 high tides and 2 low tides each day.
![Page 8: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/8.jpg)
But there’s more…
• One rotation of earth takes…
![Page 9: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/9.jpg)
But there’s more…
One rotation of earth takes…24 hours
The moon advances a little on its own rotation each day & it takes a spot on earth 50 minutes to “catch up”
So one tidal cycle high – low – high again takes 24 hours and 50 minutes
Tide charts predict when high and low tides will occur
![Page 10: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/10.jpg)
How does the sun affect tides?
• Also has a gravitational pull on earth
But the sun is 400 times farther away so the pull is not really noticed
Except…
![Page 11: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/11.jpg)
Spring Tides – straight line
• New Moon
Earth
Pull from moon combined with pull from sun. Result: exceptionally (wicked) high HIGH TIDES and exceptionally (wicked) low LOW TIDES
![Page 12: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/12.jpg)
Spring Tides
• Full Moon
Earth
Pull from moon on one side and pull from sun on opposite. Result: exceptionally high HIGH TIDES and exceptionally low LOW TIDES
![Page 13: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/13.jpg)
Neap Tides – Earth, moon and sun at a right angle
Earth
First quarter
Third quarter
Small difference between high and low not significantly great because sun and moon’s gravitational pull “cancel” each other out
![Page 14: Tides. What are they? The rhythmic rising and falling of ocean surface levels.](https://reader035.fdocuments.in/reader035/viewer/2022081606/5a4d1bf47f8b9ab0599e76b5/html5/thumbnails/14.jpg)
Types of Tides
Semidiurnal – two high, two low each day(most common)
Mixed semidiurnal – successive high tides of different heights (most of U.S. west coast)
Diurnal – One high and one low each day. (very uncommon)