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  #1  
Old 09-03-2006, 02:08 PM
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Default What are Tides? What Causes Tides?

What are Tides?
Click on the link for the NOS Discovery Kits
What Causes Tides?
Gravity, Inertia, and Bulges
Changing Angles and Tides
The Frequency of Tides
Tidal Variations
Types and Causes of Tidal Cycles
What Else Affects Tides?
Monitoring the Tides
How are Tides Measured ? Pt. I
How are Tides Measured? Pt. II


Astronomical data and moon phase info
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  #2  
Old 01-09-2008, 08:06 PM
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Talking Re: What are Tides? What Causes Tides?

i like that high tide+ full moon=good fishing
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  #3  
Old 01-13-2008, 10:40 PM
oldgoat oldgoat is offline
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Default Re: What are Tides? What Causes Tides?

Go buy an Eldridge tide book at a marina or marine store.Will answer all your questions
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  #4  
Old 01-16-2008, 05:08 PM
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Default Re: What are Tides? What Causes Tides?

What are tides?

Tides are the periodic (occurring at regular intervals) variations in the surface water level of the oceans, bays, gulfs, and inlets. Tides are the result of the gravitational attraction of the sun and the moon on the earth. The attraction of the moon is far greater than the attraction of the sun due to the close proximity of the earth and the moon. The sun is 360 times further from the earth than the moon. Therefore, the moon plays a larger role than the sun in producing tides. Every 27.3 days, the earth and the moon revolve around a common point. This means that the oceans and other water bodies which are affected by the earth-moon system experience a new tidal cycle every 27.3 days.

Because of the physical processes which occur to produce the tidal system, there are two high tides and two low tides each day. Because of the angle of the moon with respect to the earth, the two high tides each day do not have to be of equal height. The same holds true for the two low tides each day. Tides also differ in height on a daily basis. The daily differences between tidal heights is due to the changing distance between the earth and the moon.

Scientists use measurements of the height of the water level to examine tides and the various phenomena which influence tides, such as hurricanes and winter storms.
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Old 01-17-2008, 11:11 PM
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Default Re: What are Tides? What Causes Tides?

The pull of the moon on the ocean.

Why does lakes have no tides?
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Old 01-18-2008, 12:52 AM
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Default Re: What are Tides? What Causes Tides?

FRESH WATER


True tides, changes in water level caused by the gravitational forces of the sun and moon, do occur in a semi-diurnal pattern on the Great Lakes. The investigations of the U.S. Coast and Geodetic Survey indicate that the spring tide, the largest tides caused by the combined forces of the sun and moon, is less than 2 inches (5cm) in height. These minor variations are masked by the greater fluctuations in lake levels produced by wind and barometric pressure changes. Consequently, the Great Lakes are considered to be essentially non-tidal.
The moons lunar force is nine million times weaker than the force of Earth's gravity at the Earth's surface.
If the Earth's surfaces were completely submerged by an ocean of unvarying depth and if the Earth were to face the Moon at all times, there would be tides two feet high.
In addition to rivers, lakes are also affected by the lunar tide action. These are effects usually easier to detail. Lake high tides are opposite the Moon when the Moon is below the horizon. If the Moon is up, the water of the lake follows the Moon around the shore. Low tide goes along the opposing shore. Lake Michigan, for example, has a tidal difference of 1 and 3/4 inches.

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Old 01-18-2008, 01:13 AM
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Default Re: What are Tides? What Causes Tides?

The first tide predicting machine was designed by by Sir William Thomson (Aka Lord Kelvin) It went into operation in 1873. By 1910 the US Coast and Geodetic Survey had the Coast and Geodetic Survey Tide-Predicting Machine No.2. It was eleven feet long, two feet wide, and six feet high with a weight of 2,500 pounds. Thirty-seven elements bearing on tidal prediction were represented by components of the machine. This machine was used to attempt to predict the tides.
This was an integrating machine designed to compute the height of the tide in accordance with formula #1 below.
[u](1) h = Ho + Sum{ƒH cos[at + (Vo+u) - K]}


Kelvins Tide Machine



Accompanying the tides are currents. Finding the velocities of these currents was also attempted by Machine No. 2. These velocities are a sum of a series of harmonics of periodic elements of the tides.
The first machine made to compute simultaneously the height of the tide and the times of high and low waters.
It was completed in 1910 and is known as the United States Coast and Geodetic Survey tide- predicting machine No. 2

Prediction Machine link

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Old 11-09-2008, 01:14 PM
padebco218 padebco218 is offline
 
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Post Re: What are Tides? What Causes Tides?

My father wrote the book on this, literally. Check out "Beyond the Moon" by James Greig McCully for all you ever wanted to know on this subject...and then some.
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