2.4.6 - Unit of space of a tide wave.

There are several tidal waves, one for each tidal basin.


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prologue > index tides > 2.4 Confrontation on the tides.

2.4.1 Confrontation on the tides - introduction.
2.4.2 Two different descriptions of the tides.
2.4.3 The physical formula valid for the tides.
The ratio of the forces.
Number of the tide waves.
Unit of space of a tide wave.
When Earth, Moon and Sun are aligned.
Different tide cadences.

Code proposition: [P0] neutral; [P1] classic theory; [P2] favouring the inductive approach; [P3] inductive approach.


[P3] There are several tidal waves, one for each tidal basin; each of them does not move westwards, from a meridian to the successive one, but in a roughly circular way, within its own basin.

Clockwise on the southern hemisphere; counter-clockwise on the northern one. Because of how the action of the celestial bodies is focused, as the inclination of the Earth's axis varies with respect to the Moon and Sun.

Basin of the North East Atlantic, where tides occur twice a day, as in the majority of basins.

Figure nr. 1.

At the passage of the Moon on the meridian, the high tide is where the red line is. At the successive hours, the high tidal wave moves to the successive lines, counterclockwise, as this basin is on the northern magnetic hemisphere.

The continents block the flowing of the tidal waves.

[P1] Ordinarily, the two semi-diurnal tidal waves advance from one meridian to the next, westbound. However, the continents stand in their ways. So they are diverted towards the equator. Somehow, they deviate.

The continents do not block the flowing of the tidal waves.

[P3] That is not true. One has just to consider the tidal basins in the oceans whose longitudinal extension is large (Pacific and Indian Oceans).

Figure nr. 2.

courtesy NASA \ Po.Daac.

For each basin, there is one tidal wave, which, instead of moving westward, moves around its amphidromic point.

That is true for all the tidal basins, does not matter whether its western border is a continent, or an open and deep ocean.