Naked Science Forum
On the Lighter Side => New Theories => Topic started by: Yusup Hizirov on 05/08/2018 19:56:17
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What creates tides - a tidal wave or a tidal current?
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Do you know what the phrase "tidal wave" means?
tidal wave
noun
an exceptionally large ocean wave, especially one caused by an underwater earthquake or volcanic eruption.
a widespread or overwhelming manifestation of an emotion or phenomenon.
"a tidal wave of crime"
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I meant that it moves in the ocean under the moon, from the east to the west (at a speed of 1600 km / h) - a tidal wave or a tidal current?
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Do you mean the tidal bulge?
https://www.britannica.com/science/tidal-bulge
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Do you mean the tidal bulge?
Quite right! https://www.1902encyclopedia.com/T/TID/tides-03.html
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Imagine I have a long room with a narrow strip of carpet running down the middle, and nailed down at both ends.
The carpet is a bit elastic.
I can put a round piece of wood under it at one end and create a bulge.
And I can roll the wood along the floor so that the bulge moves along the room, from one end to the other.
The bulge in the carpet moves.
But the carpet is still nailed down. It does not move.
In the same way, the moon pulls on the "elastic" surface of the ocean as it goes overhead, and it drags a "bulge" along with it.
But there is no net flow of water round the world.
So, while there are local currents that flow into and out of estuaries (and bigger scale bays too) there is no "tidal current" in the way you seem to be suggesting.
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Very lucid explanation of the tidal wave.
To form such a wave, the Moon must fall into the ocean.
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the Moon must fall into the ocean.
It does- continuously.
But it keeps missing. That's how orbits work.
Or did you miss the point that-rather than lifting the carpet from underneath using a stick- I could have pulled it up from above using a vacuum cleaner or something?
It hardly matters. There is no need for the carpet to move along the room, and there is no need for the tide to drag water round the world.
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Because tides are an extreme example of a shallow-water wave, friction with the ocean floor slows tides to a speed of about 700 kilometers per hour (435 miles per hour).
https://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/tides
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The idea of a single speed for the tidal bulge makes no sense.
It obviously varies enormously with latitude.
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Because tides are an extreme example of a shallow-water wave, friction with the ocean floor slows tides to a speed of about 700 kilometers per hour (435 miles per hour).
https://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/tides
But tidal waves (tsunamis) move without moving water relative to the surface of the earth and they can not wipe the ocean floor.
The channel theory of tides. John Erie
http://myzooplanet.ru/okeanologiya-okeanografiya_918/106-kanalovaya-teoriya-18624.html
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1960 Землетрясение в Вальдивии. Чили
Главные цунами (приливы) мчались по Тихому океану и опустошали Хило, Гавайи. Волны размером до 10,7 метров (35 футов) были зарегистрированы на расстоянии 10 000 километров (6200 миль) от эпицентра и так далеко от Японии и Филиппин. https: // en.m.wikipedia.org/wiki/1960_Valdivia_earthquake
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But tidal waves (tsunamis) move without moving water relative to the surface of the earth and they can not wipe the ocean floor.
This is incorrect.
All shallow water waves involve a vertical circulating movement of water which has no net horizontal flow. In deep water this effect is very small at the sea bed, but as the wave approaches land the effect becomes greater - if you have ever scuba dived you will have felt the forward/backward motion as the wave passes over. This interaction with the seabed causes the wave to slow and its wavelength shortens. The effect can cause significant seabed scour particularly in the runup zone, which can be up to 1km from the shore.
The main tsunami (tides) raced across the Pacific Ocean ....
A tsunami is not a tide. The popular habit of calling it a tidal wave is a misnomer.
You seem to be confusing cause and effect.
The earth/moon/sun system causes a tidal bulge which, when continents, estuaries, channels etc are taken into account, causes tidal currents.
Currents do not cause the tides.
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The statement that the Earth rotates inside the liquid shell of the ocean, I believe unreal.
http://www.waterencyclopedia.com/St-Ts/Tides.html
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The idea of a single speed for the tidal bulge makes no sense.
It obviously varies enormously with latitude.
Done right, what do you think, what is the speed of the tidal wave at the equator?
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A great video.
I'm wondering for the past few thousand years the planet has been in relative tidal homeostasis according to historical accounts of tides and location of ice sheets......so what happens in the event of polar ice melts where pack ice-mass is redistributed as water to equatorial regions owing to the spin of the planet....or am I wrong in thinking that?
On a technical point, I think a sound theory of gravity will better explain the effect of the Moon with the Earth. Although some models suggest that the moon and earth and tides can be explained together through other means, the large scale "resonance" of mass over time between the earth and the Moon (earth including water mass, of coutrse) posits tides with the Moon...."as" a general resonance effect over time, yet as I point out, a theory of gravity re. the earth and the moon "could" explain this effect. I don't think we have that theory for gravity yet, despite the assumption being there for gravity re. the earth and the moon and tides.
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what is the speed of the tidal wave at the equator?
Do you mean the tidal bulge?
https://www.britannica.com/science/tidal-bulge
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The idea of a single speed for the tidal bulge makes no sense.
It obviously varies enormously with latitude.
Done right, what do you think, what is the speed of the tidal wave at the equator?
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Do you mean the tidal bulge?
https://www.britannica.com/science/tidal-bulge
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The idea of a single speed for the tidal bulge makes no sense.
It obviously varies enormously with latitude.
Done right, what do you think, what is the speed of the tidal wave at the equator?
Enter the speed in km / h.
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Enter the speed in km / h.
The speed of what?
A water wave or the tidal bulge.
On'es a lot bigger than the other and you seem not to understand that difference.
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Enter the speed in km / h.
The speed of what?
A water wave or the tidal bulge.
On'es a lot bigger than the other and you seem not to understand that difference.
Tidal bulge.