How tidal forces cause ocean tides in the equilibrium theory

Ng, Chiu-king

doi:10.1088/0031-9120/50/2/159

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…(16) Including the known values for the relative densities and maintaining the order of the terms leads to (18) The first two values represent the strong influence of the Moon and Sun, respectively. The tidal force can be related in a linear fashion to the expected height of tides (see equation ( 4) of [9]) and a convenient and coincidental numerical scaling can be exploited. The values correspond closely to the tide, expressed in metres, to be expected around parts of Ireland and Britain of roughly 4.8 m, which numerically is the sum of the first two values in the above sum.…”

Section: Densities the Resulting Tidal Influences And Total Tidal Forcementioning

confidence: 99%

Just how much do the planets affect the tides?

Cregg¹

2017

Phys. Educ.

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The influence of the planets, and planetary alignment on the Earth's tides is addressed. Starting from Newton's law of gravitation, the tidal influence of any celestial body is expressed in terms of its apparent size and its density. From this, planetary alignment can be seen to contribute at most tenths of a millimetre to a tide and so is unlikely to be a significant contributor to exceptional tidal events. The likely causes of extreme tidal events are outlined: when the Sun and Moon are each closest to Earth, equinox, and weather-in particular extreme air pressure, rainfall, and wind. We conclude with the long-term influence of the planets on the Earth's orbit and thus on the Sun's tidal effect (with timescales of the order of 100 000 years), and planetary influence on the Moon's orbit.

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Section: Densities the Resulting Tidal Influences And Total Tidal Forcementioning

confidence: 99%

Just how much do the planets affect the tides?

Cregg¹

2017

Phys. Educ.

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“…Assuming the Moon and the Sun as static spheres and the water deformation as ellipsoids [1,2,13], at any time, the oceanic tide height H can be calculated using the following Eq. (1a).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Determining the gravitational effects on tide height on an stuary and theoretical comparisons

et al. 2019

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Two identical homemade prototypes are used to monitoring the tide levels on two strategic points of the Serinhaém estuary. This monitoring was realized along a period close to the new moon phase. From the analysis of the experimental results, the average height of the tide is determined between each period of high-tide and low-tide. These estimations show discrepancies minors than half order of magnitude, compared to the theoretical predictions of the static and dynamic oceanic tide models. Also, the amplification effects of the tide in the estuary head can be quantified exhibiting a maximum gain of 1.33, which is observed in the new moon phase.

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“…This is best shown using simple vector algebra, not just words alone. For a fuller explanation, see the papers published in this journal by Härtel [2] or Ng [3].…”

Section: An Ebb and Flow Of Ideasmentioning

confidence: 99%

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2017

Phys. Educ.

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How tidal forces cause ocean tides in the equilibrium theory

Abstract: We analyse why it is erroneous to think that a tidal bulge is formed by pulling the water surface directly up by a local vertical tidal force. In fact, ocean tides are caused by the global effect of the horizontal components of the tidal forces.

Cited by 7 publications

References 6 publications

Just how much do the planets affect the tides?

Just how much do the planets affect the tides?

Determining the gravitational effects on tide height on an stuary and theoretical comparisons

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