01-08 Tides and Currents Flashcards Preview

Boat Forces > 01-08 Tides and Currents > Flashcards

Flashcards in 01-08 Tides and Currents Deck (17)
Loading flashcards...
1
Q

What is high tide?

A
  • Water at its highest level
2
Q

What is low tide?

A
  • The lowest point when water stops falling.
3
Q

What is the tidal range?

A
  • The height difference between a high and low tide.
4
Q

What are tidal rips?

A
  • Strong localized, narrow current of water that moves directly away from the shore.
5
Q

What is a neap tide?

A
  • The point at which low tides are at their lowest.
6
Q

What is the spring tide?

A
  • A high tide that is at its highest.
7
Q

What is the charted depth?

A
  • Vertical distance from the tidal datum to the bottom.
8
Q

What does diurnal mean?

A
  • Occurring once every 24 hours.
9
Q

What does semi-diurnal mean?

A
  • Occurring twice every 24 hours.
10
Q

How does Barometric Pressure affect the tide?

A
  • Higher pressure caused the water level to lower and vice versa.
11
Q

What is the tidal current?

A
  • Horizontal movement due to the tide.
12
Q

What is ocean Current?

A
  • A current occurs due to several factors in the ocean, mostly permanent.
13
Q

What are rotary currents?

A
  • Usually, occur in deeper waters where the direction changes through all points of the compass.
14
Q

What is a flood?

A
  • Something that overflows normal height.
15
Q

What is an ebb?

A
  • Movement of the tidal current away from the shore.
16
Q

What is slack water?

A
  • Occurs when there is no movement of water, usually at high and low tide.
17
Q

What is set and drift?

A
  • Set - Direction towards which a current flows.

- Drift - The speed of the current.