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17 Cards in this Set

  • Front
  • Back
Why are tides shallow water waves?
because tides have a depth of < 1/20 of wavelength. (about 1000 km)
What is the wavelength of a typical tide?
VERY LONG (1/2 circumferece of earth) ~ 20,000 km
What two opposing forces are responsible for the earth’s tidal bulges?
Gravitational force and centrifugal or inertial force
The two opposing forces create...
two bulges in the oceans
Alignment of Earth-Moon-Sun causes
SPRING TIDES- higher high tides and lower low tides
90o arrangement of Sun/Earth/Moon causes
NEAP TIDES (lower high tides and higher low tides)
to be clear...
Spring tides= Full and new moons

Neap tides= 1/4 and 3/4 moons
Note: highest tides are generally NOT
at the equator
What are diurnal, semidiurnal and mixed tides?
Diurnal- 1 high and 1 low (Gulf coast)

Semidiurnal- 2 high and 2 low (Atlantic)

Mixed 2 high and 2 low but unpredictable (pacific)
a lunar day is
24 hrs and 50 minutes
a tidal cycle is
12 hours and 24 minutes
(12 hours= earth's rotation 12 minutes= moon's orbit)
What is the difference between lunar and solar tide? which is largeer?
While the Sun's gravitational force is much larger, it is also much further. Thus the lunar tide creates a larger bulge.
200 M/SEC
What is the difference between equilibrium and dynamic theories of tides?
Equilibrium theory is idealized. Dynamic theory is more accurate it takes into account land masses, ocean basins and friction
What are ebb and flood tides?
In narrow basins there are

flood tides- incoming tides
ebb tides- outgoing tides
What is a tidal bore?
tide that has moved up a river.
What is a seiche?
Rocking standing waves (bathtub)