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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.
1,277 Questions
Why do you have two high tides per day?
It happens in most coastal areas of the Earth (not all) and is due to the differing force of gravity at different distances.
The Earth is a 'rigid' body moving in free-fall in its orbit, with the Sun's gravity acting in effect at its centre. The ocean experiences a greater force where the Sun is overhead (because it's closer), and a lesser force at the opposite point (because it's further away). Where the Sun is overhead the net force is towards the Sun, and at the opposite point it is away from the Sun. So there are two areas of deeper water per 24 hours.
In reality the movement of the oceans is complicated by the presence of land-masses, so the actual movement is very complex. It is also made more complex by the Moon's gravity, but the principle is the same.
If the Earth were a long distance from the Sun there would be a smaller difference between the forces on opposite sides of the Earth and the tidal effect would be less.
What is the time difference between two tides?
So if you know that low tide is at 0800 today you can estimate that it will be at 0850 tomorrow.
What is the cause of tides in ocean?
an ocean tide refers to the cyclic rise and fall of seawater. Tides are caused by slight variations in gravitational attraction between the Earth and the moon and the Sun in geometric relationship with locations on the Earth's surface. Tides are periodic primarily because of the cyclical influence of the Earth's rotation.
The moon is the primary factor controlling the temporal rhythm and height of tides . The moon produces two tidal bulges somewhere on the Earth through the effects of gravitational attraction. The height of these tidal bulges is controlled by the moon's gravitational force and the Earth's gravity pulling the water back toward the Earth. At the location on the Earth closest to the moon, seawater is drawn toward the moon because of the greater strength of gravitational attraction. On the opposite side of the Earth, another tidal bulge is produced away from the moon. However, this bulge is due to the fact that at this point on the Earth the force of the moon's gravity is at its weakest. Considering this information, any given point on the Earth's surface should experience two tidal crests and two tidal troughs during each tidal period.
What happens during a spring tide and a neap tide?
During a spring tide, the high water mark would be high up on the beach on the flood, and very far out on an ebb tide. During a neap tide, the high water mark is not so high or so low as during a spring tide.
The reasons why high tides come at a different time each day?
When the moon is going in its orbit, because it is an elipse, it will be closer to the Earth at different times. Therefore, the Moon's gravity will be stronger, or weaker everyday, which makes it take more or less time between the tides.
How many times do neap tides occur in one month?
http://www.pol.ac.uk/home/insight/tideinfo.html Proudman Oceanic Laboratory states that spring tides and neap tides occur twice a month. Interestingly, they occur on the earth between 36 to 48 hours after the full moon and the new moon when the earth, moon and sun are aligned. http://www.waterencyclopedia.com/St-Ts/Tides.html A good illustration of the position of the earth, sun and moon during neap tides and spring tides makes it clear why there are two of each per month. From the Water encyclopedia. http://svs.gsfc.nasa.gov/stories/topex/index.html Shows how the topography of the ocean floor can dissipate energy and causes the tides to be lower than anticipated.
What can tides cause on coastal waters?
No, the moon does.
Back when the moon still rotated, earth's gravity would have induced a small amount of tidal motion in the lunar regolith, just as the moon induces tides in earth's crustal rock. These tides are not large, just fractions of an inch (millimeters). The tides in free flowing material like water get much higher (measured in feet or a meters).
Today (and for untold eons) the moon has been tidally locked to earth, and rocks back and forth very little during its month long journey around the earth. This rocking motion exerts tidal effects on the lunar surface, but again it is very small.
When high tides occurs in a day?
Tides are periodic rises and falls of large bodies of water. Tides are caused by the gravitational interaction between the Earth and the Moon. The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side). Since the earth is rotating while this is happening, two tides occur each day.
How regularly do tides change?
There are generally two high and two low tides during each 24 hour period, so there would "usually" be four changes per day.
There are two low, and two high tides every Lunar day. A lunar day is the time it takes a fixed spot on the earth to rotate from beneath the moon, and to reach the moon again.
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What causes the earth to experience spring and neap tides on a bi-monthly basis?
spring tides are caused when the moon and sun cause a pull on the earths waters and sence the moon is closer it creats a stronger pull. thus creating higher high tides and lower low tides.
neap tides are caused when the moon and the sun are at a 90 degree angles and the moon has a stronger pull so it pulls the waters to it. thus creating height low tides and lower high tides.
Spring Tides: Twice a month, the new moon and full moon, the sun and moon are lined up. Their combined gravitational pulls producing extreme high and low tides.
A receding tide occurs when the water level along the shore decreases as water moves away from the coastline. This happens as the tide flows back out to sea, exposing more of the shoreline and seabed.
What are the highest and lowest tides called?
It is called the height of the tide. It is more at spring tides (every two weeks) and less at neap tides (the alternate weeks).
The tidal height at Lydney in the UK is 51 ft at spring tides.
Or to phrase the question differently, "Who discovered the correct explanation for the phases of the moon." I too would like to know. Did ancient astronomers know that the moon was reflecting the sun? Did they further discern that the phases were a result of seeing half-illuminated sphere from a different angle.
This drawing by Galileo suggests that he had it figured out, but was he the first: http://commons.wikimedia.org/wiki/Image:Galileo_moon_phases.jpg
What was the high and low teperature last Friday?
Sunrise/Sunset? Tides? Temperature? Stock exchange? Money Market?
What is the difference between the high tides and low tides?
because the high tides are tides that you you can like go into and the high tides make an arch so you can go in them. The low tides cant push you down and the are like you getting splashed by someone.
The process by which organisms keep their internal conditions relatively stable is called homeostasis.
Although it is not officially a life function, without it, it would be very hard to survive.
The condition is constantly being threatened by changes in the environment, such as shifting temperatures and changing light. An example of homeostasis being carried out is when your breathing and heart rate automatically pick up in order to keep your cells supplied with enough oxygen when you're exercising, or when your pupils dilate in the dark to let more light in. Slowing down all body functions in cases of extreme cold is another example; in some animals this process can go so far as to become hibernation, and helps the animal to survive until food is plentiful again.
Are tides the same on all coastlines?
Tides are the same, but the same type of tide could or could not be happening in another place.
How often do tides change in one day?
The tides change during the day, depending on the moon phases. If there are full moons or new moons, or every 14 days, a spring tide occurs. Every first or third/last quarter, a neap tide occurs. These also effect the tidal ranges of low and High.
Hope I helped!
