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Note

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Tidal power should affect the rotation of the Earth. I think that the effect is too small to be perceptible. — Preceding unsigned comment added by 83.216.95.91 (talk) 12:23, 13 January 2018 (UTC)[reply]

This is already mentioned in the article, but with no numerical estimates. — Preceding unsigned comment added by 83.216.95.91 (talk) 12:29, 13 January 2018 (UTC)[reply]
See https://physics.stackexchange.com/questions/6400/are-tidal-power-plants-slowing-down-earths-rotation
Admittedly, this is a blog. — Preceding unsigned comment added by 83.216.95.91 (talk) 14:05, 13 January 2018 (UTC)[reply]
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Port Berth Tidal Power Generator

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There has been research and conceptual studies done in regards to closed loop hydraulic systems activated by the tidal lift and fall of extremely heavy ships in long term berthing. A second type of Port Berth Generator is based on the rise and fall of Cargo Ships being loaded and unloaded. The first system is utilized any where on earth with Tidal activity. The second system is basically for Container Ports where the rise and fall is in excess of 18ft 5.5 meters. This work has been done with the calculations of the USS United States in its Philadelphia Berth Tide conditions for the smaller tidal only system.Cpwieser (talk) 02:31, 8 March 2021 (UTC)< cpwieser personal research and calculations> The potential alternative energy generated from Port Berth systems can be used for Pumped Hydro Power, Compressed Air Storage, and Electricity. Reprint from thehkera.org;HK Era notes; 7-3-2018 Port Generator / Berth Vertical Actuator/ Overview We have a vertical motion in place which has huge potential. Imagine having a 110,000 ton weight moving up and down vertically 72” every six hours. Sheer weight and Gravity are the motivating forces in the down motion of the system, floatation and buoyancy are the factors affecting the system in the up motion of the system. In this overview we are considering the actual energy generation from a hydraulic closed loop system. This hydraulic system will be actuated by a mechanical force acting on a hydraulic cylinder which will then transfer hydraulic fluid through a hydraulic motor driving a PM generator. There is a vast amount of energy available to act on this closed loop system. The force on the system is equal in both directions of movement, both directions transferring a vast amount of energy into the hydraulic system. Since a very early age watching the vertical change in Tides has intrigued me. The Chesapeake and its tidal tributaries provided me with a first hand analysis from age 10 through 25. Visiting the Baltimore Harbor in the late 1960’s it was an awe inspiring thing to realize that all 26 huge freight carrying Ships, Barges, and Vessels, millions of tons of steel and cargo were being lifted 5 ½ ft vertically in about 6 hours! For Free. Just think for a second how large of a crane at what incredible cost it would take to just lift two ships up vertically 5 ft???[reply] 

  I think we need to design a Shipping port located Generator that is potentially capable of generating an endless supply of energy at no fuel cost what so ever.  Imagine a machine about the size of a long shipping trailer attached to the bottom of the sea in every berth location in any or every port in the world. This machine would have a long horizontal beam with a latch hook or electro magnets to attach to the bottom of any ship in berth. Ships located in long term storage in Tidal situations could be an endless source of energy. This long beam attached to the bottom of the ship is then subject to every movement both up and down of the ship itself. This beam is attached to a very large series of Hydraulic Cylinders which then subject to movement, transfer fluid through a low pressure hydraulic system of which it is easy to yield energy. A control room situated on Port Property adjacent to the harbor could monitor a generator beneath each berthing location. The monitor would coordinate the generator functions. The timing of rise and fall of tides, scheduled with the loading and unloading of cargo will optimize the energy yield. Vertical movement of the ship yields energy in either direction, both up and down. Keep in mind a typical ship displaces from several hundred tons to several thousand tons!!

In consideration of this type of generating system it is easy to imagine the vast amount of energy available for capture during the loading and unloading of cargo. During the loading of a huge Container ship this vertical movement could be as much as 30 ft or more during both loading and unloading. Revised and amended 7-4-2018 Cpwieser (talk) 02:36, 8 March 2021 (UTC)[reply]

Wiki Education assignment: Research Process and Methodology - FA22 - Sect 201 - Thu

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This article was the subject of a Wiki Education Foundation-supported course assignment, between 21 September 2022 and 8 December 2022. Further details are available on the course page. Student editor(s): Ruizhouruizhou (article contribs).

— Assignment last updated by Ruizhouruizhou (talk) 13:39, 5 December 2022 (UTC)[reply]

Most Life On Earth Could be Wiped Out

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A paper was published by Stanford University https://cs.stanford.edu/people/zjl/tide.html called " Tidal Energy Is Not Renewable" and claims "most life on Earth could be wiped out". Those are very strong words coming from the world's most prestigious university. Shouldn't the article make note of this? Jartine (talk) 15:41, 5 September 2023 (UTC)[reply]

Given the extreme claims, caution is required in citing it. Are you or I competent in judging that paper? No. Has it been submitted to an independent scientific journal for publication? This would involve peer-review by other experts in the field. If it has been published in a reputable independent publication, then it is worth noting. If it gets published but there are other experts who disagree, then the publication would bring responses that could be referenced. Thus presenting a neutral POV of the current state of knowledge. ToolmakerSteve (talk) 23:04, 11 November 2023 (UTC)[reply]
False. The natural tides already slow down the earth’s rotation. “The
natural rotational energy loss is roughly 3 TW (Shepherd, 2003). Thanks to
natural tidal friction, each century, the day gets longer by 2.3 milliseconds.
Many tidal energy extraction systems are just extracting energy that would
have been lost anyway in friction. But even if we doubled the power ex-
tracted from the earth–moon system, tidal energy would still last more
than a billion years.” ToolmakerSteve (talk) 23:36, 11 November 2023 (UTC)[reply]
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