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Marine Science Exam 3 with correct Answers
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Marine Science Exam 3 with correct Answers
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Marine Science Exam 3 with correctAnswers
A tidal bore may occur under which condition?
A) An ocean basin that is wide and symmetrical
B) An ocean basin where the water resonates at the same frequency as the lunar tide
C) At the edge of a large ocean basin
D) An ocean basin at a position nearest the amphidromic point
E) A confining river mouth that forces the tide wave to move toward land at high speeds
- Answer -E
High or low tidal currents that change direction result in ____
A) tidal water
B) flood water
C) slack water
D) shallow water
E) ebb water - Answer -C
What is the relationship between the heights of tides and the amphidromic point?
A) Heights increase with distance from the amphidromic point.
B) Heights decrease with distance from the amphidromic point.
C) Heights increase closer to the amphidromic point.
D) Heights of tides and amphidromic points are not related.
E) The relationship is variable depending on the ocean basin. - Answer -A
When do tidal currents reach their maximum velocity?
A) Midway between slack water and high tide
B) Midway between low tide and slack water
C) Midway between high and low tide
D) During the flood current
E) During the ebb current - Answer -C
What type of tidal pattern exists on the east coast of the United States, which
experiences two high tides and two low tides of similar heights every day?
, A) diurnal
B) mixed
C) semi-diurnal mixed
D) diurnal mixed
E) semi-diurnal - Answer -E
What are high tides and low tides? Briefly explain why there are high tides and low
tides? - Answer -High and low tides are associated with the maximum (crest) and
minimum (trough) water height of short term sea level changes due to the combined
effect of the Moon and Suns' gravitational pull and Earths rotational motion on water on
Earth. During high tide, water height is highest due to water advancing the most into/
nearest to onshore areas. During low tide, water level is lowest due to water receding
away from onshore area.
In the open ocean during high tide, the body of water is bulging in the direction of
moon/sun direction
In the open ocean during low tide, there is no bulge on that side of Earth~where its high
tide x its low tide y and vise versa.
What are spring and neap tides? Briefly explain why there are spring and neap tides? -
Answer -Because orbiting planetary bodies that dictate tides on Earth are in constant
movement through space at different times of the month they may line up perfectly or
not. In the case that the Moon and Sun are horizontally aligned (at 180 degrees) in the
same direction in relation to Earth, spring tides will be present. Spring tides are the
highest high and lowest low tides that occur because of the intensified gravitational pull
from the planetary bodies, typically seen during full moons and new moons. On
contrast, in the case that the Moon and Sun are perpendicularly aligned (at 90 degrees)
in relation to Earth, neap tides will be present. Neap tides are the lowest high and
highest low tides that occur because of the divided gravitational pull from different
planters bodies, typically seen during fifth and third quarter moon periods.
What is an amphidromic point? Based on the following illustration of M2 tidal system
(color lines are the co-phase lines, and blue lines are co-amplitude lines) in the North
Atlantic Ocean, how long does the high tide at New York lag behind Brest? What is the
approximate M2 tidal amplitude in New York? (note black bold arrows highlight the
rotation direction of the tidal wave; they are not part of the contour) - Answer -An
amphidromic point is a tidal node that experiences no tide fluctuations. In other words,
areas where tidal rise and fall is zero. These areas are the center points for rotating high
and low tide patterns.
Based on the figure of the North Atlantic Ocean, New York high tide lags by 8 hours
from Brest. The approximate M2 tidal amplitude of New York is 1.0 meters as can be
depicted from the blue line of co-amplitude.
Which currents are the slow, deep currents that affect seawater beneath the
pycnocline?
A) deep-ocean
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