Chapter 5, page 6
5.6 5.1 The cause of the ocean tides.
5.2 The tide spatioles.
5.3 The tide basins.
5.4 The tide mechanism.
5.5 The times of the ocean tides.
5.6 The range of a tide basin.
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#16 - Depth and range of a tide basin.
.1 Let's consider the Pacific Ocean, its depth, and its numerous tide basins.
Figure
nr. 1
An example of a shallow sea.
.2 The North Sea has three tide basins, because of its very shallow parts.
Figure
nr. 2
The depth and the extent of a tide basin.
.3 Already, with a first analysis, the depth and the extent of each basin seem to be in correlation.
The generation phase of the tide.
.4 The generation of the tide would consist in the decreasing of the water density (page 5.1).
.5 It can occur anywhere, at any time; but the phenomenon becomes especially important at the passage of the spatioles (page 5.2), where the action of the generating bodies is best focuced.
.6 Which produces differences, both in the pressure and the levels of the water, within a basin.
The restoration of the balances.
.7 With regard to the pressure, it tends to balance by means of the thrust fronts (page 5.4).
.8 As for the different water levels, they tend to compensate by the physical displacement of water.
Direction of the restoration of the equilibrium.
.9 The restoration of equilibrium (of pressure and level) keeps changing direction; that depends on the time within the tidal cycle.
.10 If it seems to pause, it is to resume soon, the moment that new imbalances are generated, caused by the endless change of the relative positions of the Moon and the Sun.
Delimitation of the field of action.
.11 The field of action - where the endless restoration of the balances, of pressure and water levels, takes place - is called tidal basin.
.12 The area where such endless restoration of balances is determined, on the numerator, by the rates of compensating the inequalities, and, on the denominator, by the local cycle time of the tide - which can be diurnal, or bi-diurnal.
.13 So, in general, the higher the velocities of compensation, the larger the tidal basin.
The space-time dimension of a tide basin.
.14 In other words, the boundary of a basin is the moment when the compensations are no longer necessary, because of a new tidal cycle, which intervenes and creates new imbalances.
.15 As long as the depth and conformation of a basin keep constant, the time dimension of a basin also keeps constant, as well as its response to given astronomical situations, once made abstraction of the weather conditions.
Two velocities of compensation.
.16 As the velocity of compensation by physical displacement of water is extremely reduced, the factor which most determine the range of the basin is the velocity of the thrust fronts.
.17 The original values of the velocities of the fronts would depend on the depth of the water; also their transmission would depend on it.
.18 The longer the thrust fronts duration, before they transform themselves into tide wave components, the larger the area of the basin.
At the end of this chapter.
.19 At the end of this chapter, I advice the reader to watch again the movie on the ocean tides, and to ponder.
Ocean tides seen from high above their basins,
by NASA \ PO.DAAC.
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