Tides and Currents Quiz
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Tides and Currents Quiz

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@SafeHarborMaritime

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Questions and Answers

What is the frequency at which diurnal tides normally occur?

  • The number of occurrences in a tidal day varies by geographic area
  • A single high and a single low water occur each tidal day (correct)
  • One high or one low water, but not both, occurs in each tidal day
  • Two high and two low waters occur each tidal day
  • Under which conditions do spring tides occur?

  • At the start of spring, when the sun is nearly over the equator
  • When the sun, moon, and earth are nearly in line, in any order
  • Only when the sun and moon are on the same sides of the earth and nearly in line (correct)
  • When the sun and moon are at approximately 90 degrees to each other as seen from the earth
  • Which of the following best describes ebb current?

  • Vertical movement of water toward the land
  • Vertical movement of the water away from the land
  • Horizontal movement of the water away from the land (correct)
  • Horizontal movement of the water toward the land
  • How is the speed of tidal current commonly measured?

    <p>All of the above</p> Signup and view all the answers

    What are tidal current subordinate stations?

    <p>Geographical locations between the reference stations</p> Signup and view all the answers

    What is the reference point from which the height of a light is measured?

    <p>Mean low water</p> Signup and view all the answers

    When do spring tides occur?

    <p>When the moon is new or full</p> Signup and view all the answers

    What is the period during high or low tide with no change in water height called?

    <p>Stand of the tide</p> Signup and view all the answers

    Which statement defines spring tides?

    <p>Have lows lower than normal and highs higher than normal</p> Signup and view all the answers

    What is the primary datum for soundings on charts used in the United States?

    <p>Mean lower low water</p> Signup and view all the answers

    What does the term 'range of tide' refer to?

    <p>Difference between heights of successive high and low tide</p> Signup and view all the answers

    Which reference datum is used to determine the heights of land features on most charts?

    <p>Mean sea level</p> Signup and view all the answers

    How is the height of tide correctly defined?

    <p>Vertical distance from the tidal datum to the water level at any time</p> Signup and view all the answers

    Study Notes

    Tide and Current Questions

    • The height of a light is measured from mean lower low water.
    • Spring tides occur when then moon is new or full
    • Neap tides occur when the moon is at quadrature
    • The period at high or low tide during which there is no change in the height of the water is called the stand of the tide.
    • The term "spring tides" refers to tides with lows lower than normal and highs higher than normal.
    • The datum of soundings for charts used in the United States is mean lower low water.
    • Tide refers to the vertical movement of water.
    • The range of tide is the difference between the heights of successive high and low tides.
    • The reference datum used in determining the heights of land features on most charts is mean sea level.
    • The height of tide is the vertical distance from the tidal datum to the level of the water at any time.
    • On the west coast of North America, charted depths are taken from mean lower low water.
    • Mean high water is the average height of high waters.
    • Diurnal tides normally occur with a single high and a single low water each tidal day.
    • Spring tides occur when the sun, moon and earth are nearly in line, in any order.
    • Ebb current is the horizontal movement of the water away from the land.
    • The speed of the current is given in knots.
    • Tidal current subordinate stations broadcast tidal current information on the radio.

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    Description

    Test your knowledge about tides and currents with this quiz. Explore concepts like spring and neap tides, tidal ranges, and more. Perfect for oceanography students or anyone interested in marine science!

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