Chapter 9 Oceanography
Terms in this set (36)
tide-generating forces between moon and earth
Caused by gravitational attraction of Sun, Moon, and Earth
every particle attracts every other particle, proportional to product of masses, inversely proportional to square of separation distance
Center-seeking force and tethers earth and moon to each other
differences between centripetal and gravitational forces
Resultant forces and tide-generating forces
Tide is the difference between gravitational force and centripetal force
has no forces acting on it
Tidal bulges (lunar
Small horizontal forces push seawater into two bulges, opposite sides of earth, one bulge faces moon, and other bulge opposite earth
Tidal bulges (solar)
Similar to lunar bulges but much smaller, moon closer to earth
new/full moon -tidal range greatest
Quarter moons - tidal range least
Two high tides =
12 hours apart, 6 hours going up and 6 hours going down
High Tide, flood tide
seawater moves on shore
Low Tide, ebb tide
seawater moves offshore
angular distance Moon or Sun above or below Earth's equator
Unequal tidal ranges
Tidal range greatest at perihelion (January) and perigee and tidal range least at aphelion (July) and apogee
Moon away from earth
Moon closer to earth
Away from the sun (July) - lower attraction
Closer to the sun (January) - higher attraction
tide wave rotates once in 12 hours; counter clockwise in north hemisphere; clockwise in south hemisphere
continents and friction with seafloor modify tidal bulges, tides are shallow water waves with speed determined by depth of water, tidal bulges cannot form (too slow) and tidal cells rotate around amphidromic point
relating to a system of tidal action in which the tide wave progresses around a point or center of little or no tide.
Diurnal, semidiurnal, and mixed
One high tide/one low tide per day
Gulf of Mexico is an example of which tidal pattern?
Two high tides/two low tides per day and tidal range about the same
Atlantic Coast is an example of which tidal pattern?
Two high tides/ two low tides per day, tidal range different, and most common
Pacific Coast is an example of which tidal pattern?
A pattern of vibration that simulates a wave standing still
in low gradient rivers
Possible harmful environmental effects of tide-generated power?
Could stop hatching of eggs
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