Tides and Tidal Current Flashcards
A tide is called diurnal when…
Select one:
a.
Two high tides occur during a lunar day
b.
Only one high and one low water occur during a lunar day
c.
The high tide is higher and the low tide is lower than usual
d.
The high tide and low tide are exactly six hours apart
b.
Only one high and one low water occur during a lunar day
The term “flood Current” refers to that time period when the water ______________________.
Select one:
a.
Level is rising because of heavy rains
b.
Is moving towards the ocean
c.
Level is not changing
d.
Is flowing towards land
d.
Is flowing towards land
Spring tides occur ___________________.
Select one:
a.
at the start of Spring, when the Sun is nearly over the equator
b.
when the Sun and Moon are approximately 90° to each other as seen from earth
c.
when the Sun, Moon, and Earth are nearly in-line, in any order
d.
only when the Sun and Moon are on the same side of the Earth and nearly in line
c.
when the Sun, Moon, and Earth are nearly in-line, in any order
Information about currents on the Pacific Coast of the U.S. can be found in the _____________________.
Select one:
a.
Tidal Current Tables
b.
Tide Tables
c.
Nautical Almanac
d.
Ocean Current Tables
a.
Tidal Current Tables
The term “tide” refers to?
Select one:
a.
Salinity content of the water
b.
Horizontal movement of the water
c.
Mixing tendency of the water
d.
Vertical movement of the water
d.
Vertical movement of the water
Which term below refers to the direction a current is flowing?
Select one:
a.
Drift
b.
Stand
c.
Vector direction
d.
Set
d.
Set
Where would you find information about the time of high tide at a specific location on a particular day of the year?
Select one:
a.
Coast Pilot
b.
Nautical Almanac
c.
Tide Tables
d.
Tidal Current Tables
c.
Tide Tables
When the moon is either new or full which type of tides occur?
Select one:
a.
Spring
b.
Apogean
c.
Neap
d.
Diurnal
a.
Spring
The movement of water away from shore is called a(n)…
Select one:
a.
Ebb current
b.
Flood current
c.
Reversing current
d.
Slack current
a.
Ebb current
To predict the actual depth of water using the Tide Tables the number obtained from the Tide Tables is ______________.
Select one:
a.
added or subtracted to the charted depth
b.
multiplied by the charted depth
c.
divided by the charted depth
d.
the actual depth
a.
added or subtracted to the charted depth
The datum from which the predicted heights of tides are reckoned in the tide tables is…
Select one:
a.
The same as that used for the charts of the locality
b.
The highest possible level
c.
Mean low water
d.
Given in table three of the tide tables
a.
The same as that used for the charts of the locality
The distance between the surface of the water and the tidal datum is the…
Select one:
a.
Charted depth
b.
Range of tide
c.
Actual water depth
d.
Height of tide
d.
Height of tide
The difference between the heights of low and high tide is the…
Select one:
a.
Depth
b.
Distance
c.
Period
d.
Range
d.
Range
The drift and set of tidal, river, and ocean currents refer to the __________________.
Select one:
a.
type and characteristic of the current flow
b.
position and area of current
c.
maximum speed of the current
d.
speed and direction toward which current flows
d.
speed and direction toward which current flows
The point where the vertical rise or fall of tide has stopped is referred to as…
Select one:
a.
The stand of the tide
b.
Slack water
c.
The rip tide
d.
The reverse of the tide
a.
The stand of the tide
