+
Related Topics
Cards In This Set
| Front | Back |
|
Tides
|
- changes in elevation of the ocean's surface- caused by gravitational forces (moon, sun)
|
|
Two principal factors influence tides
|
- gravitational attraction- centrifugal force- balance b/w these two forces creates tidal bulges
|
|
Equilibrium Theory of Tides Assumptions (3)
|
1) Earth is completely covered w/ water2) Water is in equilibrium w/ tide producing forces3) Earth turns beneath these tidal bulges freely
|
|
Lunar tides
|
- tidal day = 24 hours 50 min- moon moves from 28.5 N to 28.5 S in a month- tidal bulge follows the moon
|
|
Solar Tides
|
- account for 46% of moon tidal force- moves 23.5 N and S of equator in course of year
|
|
Syzygy
|
- when earth, sun, and moon are in a line- spring tides
|
|
Perigee
|
- moon is closest to the earth
|
|
Apogee
|
- moon is farthest from earth
|
|
Perihelion
|
Sun is closest to earth
|
|
Aphelion
|
Sun is farthest from earth
|
|
Spring Tide
|
- syzygy- during new and full moons- gravitational forces added together- especially high and low tides- large daily tidal range
|
|
Neap Tide
|
- sun and moon at right angles; quadrature- 1st and 3rd quarters of the moon- gravitational forces are offset- daily tidal range is least
|
|
Factors affecting tidal patterns (3)
|
- shape of the coastline- configuration of the ocean basin- water depth
|
|
Barycenter
|
- common center of mass that the moon and earth rotate around- located 1600km below Earth's surface- follows a smooth orbit around the sun
|
|
Centripetal force
|
- force required to keep planets in their orbits- is provided by the gravitational attraction between each of them and the sun
|
