tidal power - hydro power 2

Question 0

bathymetry

Answer 0

study of underwater depth of ocean floors

Question 1

talk about tidal power

Answer 1

• uses 2 x a day variation in sea level(tide)
• caused mostly by gravitation effect of moon on earth and less than sun on earth
• earth rotation and bathymetry
• loys of potential energy

Question 2

tidal range

Answer 2

vertical diff between highest high tide and lowest low tide

Question 3

types of tide

Answer 3

spring tide

neap tide

Question 4

spring tide - define

Answer 4

tide from combined gravitational attraction of sun and moon when earth sun and moon are in a straight line

Question 5

neap tide

what is it?

Answer 5

tide when moon and sun are at right angles to each other.

Question 6

diurnal tide

Answer 6

one tidal cycle per day

Question 7

semidiurnal

Answer 7

2 high waters amd 2 low waters each day

Question 8

mixed tide

Answer 8

when height of 2 successive high tides or 2 low tides are very different

Question 9

what is chart datum?

Answer 9

chart datum is a tidal datum ( datum derived from some phase of the tide)

lowest astronomical tide

Question 10

lowest astronomical tide?

Answer 10

height of the water at the lowest possible theoretical tide. all tidal heights are positive

Question 11

tide gauges

Answer 11

measures tides and quantify size of tsunamis
you can derive sea level
tsunami can be detected when levels rise

Question 12

mechanism of tidal power

Answer 12

requires high tide

Question 13

tidal motion

Answer 13

complex

circulate around nodes