tides

Question 1

edd

Answer 1

negative

Question 2

flood

Answer 2

positive

Question 3

high tide

Answer 3

the gravitational pull on the water by the moon that creates a tidal bulge, the tide gets high when the sea or ocean is closer to the Moon

Question 4

low tide

Answer 4

the withdrawal in areas away from the tidal bulge

Question 5

tidal bulge

Answer 5

the distortion of water and earth in response to the combined gravitation effects of moon and sun, it is created due to centrifugal force

Question 6

why 2 high tides and 2 low tides in 24 h

Answer 6

gravitational forces create one tidal bulge; centrifugal forces create the second tidal bulge on the opposite of planet from the first tidal bulge(opposite the moon)

• the earth and moon rotate around a common center of mass
• 2 tidal bulges are equal and opposite resulting in semi-diurnal tides

Question 7

why are there mixed tides (not equal high, low tides)

Answer 7

earth has an inclination of 23.5 degrees

Question 8

how later does each tide get each day? why?

Answer 8

50 minutes later, it takes 28 day for the moon to circle the earth which rotates once every 24 h

Question 9

the form of moon’s orbit around the earth

Answer 9

elliptical

Question 10

what is perigee

Answer 10

the greater tidal range when the moon is closer to earth

Question 11

apogee

Answer 11

the smaller tidal range when the moon is further away

Question 12

what’s sun impact?

Answer 12

has a gravitational effect (it’s further from earth than the moon=> its effect is less

Question 13

spring tides

Answer 13

also, high tides, when sun and moon are in line (full moon, new moon), a compound effect resulting in higher high tides and lower low tides

Question 14

neap tides

Answer 14

tide after the first or third quarters of the moon when there is the least difference between high and low water

Question 15

earth’s orbit around the sun

Answer 15

elliptical

Question 16

perihelion

Answer 16

a greater tidal range when the earth is closer to the sun

Question 17

aphelion

Answer 17

smaller tidal range when the earth is further away from the sun

Question 18

factors that influence tides (6)

Answer 18

landmasses- water must go around land or through narrow passages
tidal bore- a large wave caused by the funding of a flood tide as it enters a long, narrow, shallow inlet
wind
barometric pressure- an increase in pressure can result in a decrease in tidal height
large output- from a river can increase tidal height
Coriolis effer

Question 19

tidal energy

Answer 19

renewable hydro-power
turbines, dams, or with generators
conversion of kinetic or potential energy from water flow into electrical energy
Tidal energy is power produced by the surge of ocean waters during the rise and fall of tides. Tidal energy is a renewable source of energy.

Question 20

tide pool

Answer 20

shallow pools of seawater that form on the rocky intertidal shore

Question 21

Why is there variation in tidal heights/ranges over one year?

Answer 21

The earths orbit around the sun is elliptical

The tidal range is greater when the earth is closer to the sun (perihelion) and smaller when the earth is further away (aphelion)

Question 22

how are tides predicted?

Answer 22

Predictions of tidal heights are made through a combination of theory and observation/measurement

Tide gauges and acoustic samplers are tools to track tides

Question 23

what is chart datum?

Answer 23

the water level surface serving as origin of depths displayed on a nautical chart. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum

Question 24

tidal barrage/dam

Answer 24

A tidal barrage is a dam-like structure used to capture the energy from masses of water moving in and out of a bay or river due to tidal forces
turbines spin and generate electricity