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Ocean Tides

Affected by the gravitational pull of the moon and sun, sea levels rise and fall on a daily basis. Ask questions here about high tide, low tide, spring tide and neap tide.

500 Questions

What type of tide occurs during the quarter moon phases?

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The exceptionally low high tides (and high low tides) that occur during the quarter-moon phase are known as "neap tides." Conversely, the exceptionally high and low tides that occur during full and new moons are known as "spring tides."

Strictly speaking, however, although there is a correlation between moon phase and tidal activity, this is not truly due to the moon. Tides are caused by the moon's orbit around the earth; the moon's gravity pulls a swell of water on the the side of the earth facing it, and a corresponding bulge on the opposite side. These vary several times per day, with the moon's once-daily orbit of the earth. So, there are about 12 hours between high tides.

Moon phases, on the other hand are purely a visual phenomenon, varying based on the the viewing angle of the moon from our vantage point, here on earth, relative to the sun. When the sun is shining behind the moon, we observe a new moon. On the front side? A full moon. When the earth, moon, and sun are aligned at roughly a 90 degree angle? A half moon. And, of course there's every phase in between. During any given day during the cycle, the tides continue to rise and fall independent of what lunar phase we happen to observe.

The spring and neap tides are actually caused by the sun. Like the moon, the sun also exerts a gravitational pull on the side of the earth that faces it, causing high tides every twelve hours -- solar tides; Although this effect is far weaker than the lunar tides (about half the effect), the height of the tide at any given time is a composite of the gravitational vectors of the sun and moon, added together, like constructive or destructive interference. Thus, when the sun and moon are on the same side of the earth (or opposite sides), their collective gravity works together and magnifies the effect, and tides are higher and lower than usual; this is what occurs during new moons and full moons -- the spring tides. Alternately, when the sun and moon are located at 90 degrees with respect to the earth, the sun and moon pull along different axes, and cancel each other out to some degree; this is what occurs during quarter moons, when tides vary far less than at other times of the month... not so high and not so low.

There is also a proxigean spring tide, an extremely high tide that occurs very rarely when the moon's orbital eccentricity also magnifies these gravitational tidal effects. This occurs when the moon's lowest point of orbit (proxigee) coincides with a full or new moon (already very high tides).

Incidentally, lunar phases are not caused by the earth's shadow falling on the moon. This would be an eclipse, which is quite rare.

Where would you find the world's highest tides?

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The highest tides in the world are found in the Bay of Fundy, located between the provinces of New Brunswick and Nova Scotia in Canada. The tides in the Bay of Fundy can reach heights of over 50 feet (15 meters) during extreme variations.

What is stand of tide?

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The term "stand of tide" refers to the period when the water level of the tide remains relatively unchanged for a short period of time. During this period, the incoming and outgoing tide currents are equal in strength, resulting in minimal movement of the water level. This can occur twice a day in coastal areas with tidal fluctuations.

When the water of the ocean is at a higher level than its average this is referred to as .?

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When the water of the ocean is at a higher level than its average, this is referred to as sea level rise.

Why is it important to be able to predict tide levels in coastal areas?

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It is important to be able to predict tide levels in coastal areas for several reasons. Firstly, accurate predictions help in planning activities such as navigation, fishing, and beach recreation. Secondly, tidal predictions are vital for coastal engineering projects, such as building harbors or designing coastal protection structures, as they impact water levels and currents. Lastly, predicting tide levels is crucial for mitigating the risk of coastal flooding, allowing communities to prepare and take necessary precautions.

What is moving mass of water?

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Tide. Tides are masses of moving water. The moons gravitational pull causes the form of a wave to occur.

When boating on coastal waters it is important to be aware of the tides?

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It can be a sign of bad weather

When low tide?

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When the Moon and / or Sun are oriented at about 90 degrees to the line between the area with tide and the Earth's center.

What is the greatest differences between high tide and low tide?

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The height difference between high and low tide varies in different places and at different times according to the earth's position relative to the sun and moon. The weather and prevailing winds also affect tide heights.

The place with the greatest tidal rise/fall is generally considered to be in the Bay of Fundy, Canada, which, on occasions can have a high/low tidal difference of some 21 metres (about 70 feet).

However, Ungava Bay (Canada) is a close contender. After long and careful comparison of the data, the Canadian Hyrodrographic Service has ruled that both places are joint first in the high/low tides competition!)

For more information about tides and the most extreme tides, see Related links below.

What is mean tide?

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Account of what has taken place, and was not before known; news.

What tide mean?

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The word tide mean befall.

What tides is important?

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importance of tides

fishing

navigation

What high tide mean?

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it means that the water is at a high level. the ocean will be closer to you where as a low tide is the opposite and it will be further away

Which is more powerful spring tide or neap tide?

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A tide has no power itself, it is dependant on the moon (mostly). A spring tide has the greatest range, from high to low, because the sun also helps.

When the sun and moon are aligned spring tides are produced. When they are at right angles, with respect to the earth, then neap tides are produced. Neap tides have the smallest difference.

What would happen to the tides if there was no moon?

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The moon is actually moving away from the earth, very slowly. This is caused by some interesting tidal effects. Someday hundreds of thousands or millions of years from now there will be no such thing as a total solar eclipse because the moon will be too distant to completely block the face of the sun. If the moon were ever to get closer, we had better hope that it also gets a little faster. If it didn't it would come crashing down eventually and catastrophically. The closer orbiting bodies are to their hosts the faster they move through their orbits. At one time it was theorized that the moon formed by being literally thrown off by the earth in the days when the earth was nothing but molten rock. Somehow, people thought, the surface bulged at one point and a clump of material broke free. One problem with this theory is that extrapolating backwards from the moon's current distance and velocity, at the time of its break from earth it would have had to be moving in its orbit at a velocity that is impossibly fast. This can't have been the moon's origin.

What is the name of the tidal wave that can occur after a earthquake?

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Such waves have nothing to do with tides. The preferred term is tsunami.

Why do fisherfolk want to know whether there will de a high tide or low tide?

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There will be a high tides and low tides are the effect of the moon's gravitational pull on our ocean

When is the best time to swim in the ocean high or low tide?

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Simming at high tide is as safe as swimming at any other time. Whether the tide's in or out doesn't change the level of safety invovled.

What area of land is covered at high tide but not at low tide?

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The intertidal zone is the area that is exposed to the air at low tide and submerged at high tide. (also known as the "foreshore" or "littoral zone")

Source

http://en.wikipedia.org/wiki/Intertidal_zone

If this information was found to be helpful or accurate, please add trust.

Thank you.

Exceptionally high or low tide?

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Don't worry Mariah a.k.a Serene is here to save the day.....

The answer is Spring Tide :)z!

Why are river tides have more variance than ocean tide?

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tides periodically rise and fall on the water level of the ocean and waves move in an up-and-down motion along the surface of a body of water <3<3<3<3<3<3<3