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**New Theories / Re: Rotating earth theory of two high tides a day**

« **on:**26/04/2018 22:52:12 »

The actual tidal force due to the moon, is very small, just 1.1e-7g, so if you work it out that's only a couple of feet on a body like the Earth that's got a 6,300 km radius.

But water has 'slosh', or equivalently, the flow of water can resonate to some degree. So it's the resonant frequencies and Q-factor of the flow of the water that matters. Where it's highly resonant, then the tides would build up and up to a high level, but where the Q-factor is low, you'll get small tides.

The mediteranean is clearly fairly well damped, because the water has try to flow in via the Strait of Gibraltar, which is a relatively narrow channel, and the volume of the mediteranean is reasonably large, so there's no way the whole med can fill up much before the tide turns back.

You might be able to model the med quite well as a Helmholtz resonator. I haven't run the numbers, it might be interesting to do that if we can estimate them, but I bet dollars to donuts it's not resonant with a 12 hour cycle!

https://en.wikipedia.org/wiki/Helmholtz_resonance

Meanwhile Spain and Portugal are fed by the Atlantic, rather than a narrow channel, so the water can slosh towards and away with much less resistance, so has a far higher Q-factor and the tidal range is inevitably much greater.

But water has 'slosh', or equivalently, the flow of water can resonate to some degree. So it's the resonant frequencies and Q-factor of the flow of the water that matters. Where it's highly resonant, then the tides would build up and up to a high level, but where the Q-factor is low, you'll get small tides.

The mediteranean is clearly fairly well damped, because the water has try to flow in via the Strait of Gibraltar, which is a relatively narrow channel, and the volume of the mediteranean is reasonably large, so there's no way the whole med can fill up much before the tide turns back.

You might be able to model the med quite well as a Helmholtz resonator. I haven't run the numbers, it might be interesting to do that if we can estimate them, but I bet dollars to donuts it's not resonant with a 12 hour cycle!

https://en.wikipedia.org/wiki/Helmholtz_resonance

Meanwhile Spain and Portugal are fed by the Atlantic, rather than a narrow channel, so the water can slosh towards and away with much less resistance, so has a far higher Q-factor and the tidal range is inevitably much greater.

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