I have heard the term ‘tidal bulge’ to account for the fact that there are two High Waters a day. What is this ‘bulge’?
The tidal “bulge” is a purely theoretical phenomena relating to the theoretical Equilibrium Tide, which would exist only if the world were covered entirely by water. The tides actually experienced around the world are all generated in the great oceans, which oscillate as a result of the tide raising forces acting in concert with the natural period of resonance of each ocean. The oceanic tides are then modified by the shallow water tides generated in the continental margins thereby resulting in the tides actually experienced at the coast. Any authoritative textbook on tidal theory should give a comprehensive explanation of the tide raising forces and their impact on the waters around the world. Our own Admiralty Manual of Tides (NP120) may possibly be found in a local reference library; otherwise it can be obtained via our Admiralty Webshop at http://www.admiraltyshop.co.uk. There are twenty four Time Zones in the world each of which covers 15° of longitude.
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