Talk:Tidal bore

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This is an interesting phenomenon that is worth explaining to us, if you understand the dynamics of a tidal bore. Wetman 09:32, 13 Oct 2004 (UTC)

I'm just writing an article on solitons, so hope to have more detail. One thing to say immediately; bores =/= solitons. Usual soliton definition is a single wave that's level water both before and behind. Bores are height discontinuities. Sometimes a bore is just a turbulent step in water height (like a travelling waterfall); that isn't a soliton. Other times it's called "undular", where there's a smooth leading shockwave followed by a train of solitons. Raygirvan Apr 30 2005

In some places 2m is converted to 6 ft, others 7ft on this page. It's possible that the 6ft/7ft discrepancy comes because precision is lost when converting to meters, but it could also be the case that someone just converted m->ft differently. Anyone know which it is? LactoseTI 16:41, 2 August 2006 (UTC)

The following unsourced, anonymous comment was in the "Asia" section :-
"Tidal bores occur in lakes and rivers. They only occur in the coast becasue there is a bigger tide range."
Do they? Does anyone know what it means? Or where it comes from? Or why it's in the Asia section? Swanny18 (talk) 12:38, 28 November 2007 (UTC)

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More bores.[edit]

There are a heck of a lot more bores than this, it's just that they are either difficult to get to or they are very small. For example, Sydney Harbour has a bore almost every day (depending on the moon phase) near the Olympic Village in Homebush, but it's only 15cm (six inches) high. Old_Wombat (talk) 08:54, 11 October 2011 (UTC)

There is nothing prohibiting you from adding the Sydney Harbor bore and any others to the listing on the page. Feel free to add it (make sure to reference your source). SEKluth (talk) 22:55, 14 May 2019 (UTC)

Help! How does a Tidal Bore Develop?[edit]

I just read the entire article and I still have no idea what hydraulic mechanism precipitates the initial wave. If that is unknown, the article should clearly state it, up front. If it is known there should be some verbal and pictorial representation. Since there is nowhere in the world that the ocean tide just instantly "leaps up", there must be some trigger of some sort that initiates the wave. I would really like to know how it forms. Thanks. — Preceding unsigned comment added by N0w8st8s (talkcontribs) 23:54, 8 June 2013 (UTC)

It's not a "trigger", just a nonlinear wave propagation mechanism. Sort of like how waves break on a beach. Here is some math about it, in case you'd like to add that to the article. Here is another. Dicklyon (talk) 03:23, 9 June 2013 (UTC)

You don't need that much math. The key concept is that waves on water travel faster in deeper water. You can see this over looking a beach - as the waves approach shallow water, they rise up vertically, and they slow down, so they get closer together.

This is what happens in a bore. Wave #1 travels up the river. As it does, it travels over shallower ground and so slows down a little. If the tide and the water depth and river width and the river depth profile and all (and I do mean ALL, which is why it doesn't happen everywhere all the time) the circumstances are right, according to that maths stuff, then when the wave passes, the water level behind it has now gone up a fraction. So wave #2, following, is travelling on ever-so-slightly deeper water and is therefore ever-so-slightly not slowed down as much, and ever-so-slightly catches up. And it leaves deeper water still, so wave #3 following it gets he same effect and so wave #3 catches up to #2. And #4 to #3. And so on and so on. Eventually, the waves are almost on top of each other and you have the bore. — Preceding unsigned comment added by (talk) 08:32, 8 July 2014 (UTC)

impact of salinity changes of tidal bores?[edit]

Is there any information available along these lines for the article? HammerFilmFan (talk) 05:30, 6 July 2013 (UTC)


i dont know how to fix it but in the suggested search pull down for this page, the byline is "i love trains" — Preceding unsigned comment added by (talk) 20:42, 13 June 2018 (UTC)

Thank you for the heads-up. I've fixed the vandalism (that been around for several months, ugh). Chris857 (talk) 20:47, 13 June 2018 (UTC)