Gnasher Posted November 22, 2005 Report Share Posted November 22, 2005 I have been trying to understand when spring tides occure. Do we get these every month, how often, etc? Is there any useful sites that I can use that will help me determin what location i choose. I have checked out one web site and it says that 2morrows high is 1.7m. Is that a big tide a small tide or what? It aslo says that Hurst is 2.2m and xchurch entrance is 1.7m. why the difference when its only a few miles apart. Is tommorrows a big tide at the back of the island? The post all sounds a bit stupid and basic, but its stuff i need to know. Quote Link to comment Share on other sites More sharing options...
duncan Posted November 22, 2005 Report Share Posted November 22, 2005 Dan, Click hereand let the enchanted learning experience enlighten you Quote Link to comment Share on other sites More sharing options...
Afishionado Posted November 23, 2005 Report Share Posted November 23, 2005 A simplified version........... NEAPS Less water moving and not quite so high or low as a spring SPRINGS Most water moving, higher highs and lower lows THE HIGHT GIVEN is always a 'prediction' not a certanty. This is because beside the movement of the moon, air pressure affects the hight/flow of water. eg .. High air pressure (light winds) presses down on the water surface and suppresses the tidal flow. Low air pressure (stormy weather) With less pressure on the waters surface the level and speed of flow can 'Surge' creating tidal flooding conditions in very low pressure storm centers. WATCH THE MOON Full or new moon = Spring tides Half moon (and degrees of) = Neap tides. The tide hight given is the hight OVER the 'chart datum' . The chart datum is basically the LOWEST tide you could ever expect in that area. Thats why you see lots of drying areas on a harbour chart and yet you might never have seen the water that low. Differences in hight for a given area......... Some areas 'pinch' the flow of water so that the same amount of water has to pass through a narowing channel, this speeds up the flow AND as the water can only move upwards in hight for the given area it has to flow, the depth of the water over the chart datum increases. The perfect example is the Bristol Channel where they get 20 t0 40ft tide hights as the channel narrows. A full 12 hour of tide progresses at 20 min per 12 hour low to high to low again tide. eg Low water Monday 12 noon Low water Tuesday (24hrs = 2 full tides X 20min per tide = 40 min) 12.40pm All of the above is generalisation and the purist will happily pick minutia out of it, but it all one needs to have a good working knowledge of the tide around OUR coast. Oh and lastly the EQUINOX's Simplified, these occure one in the SPRING and one in the AUTUMN, and very roughly coinside to the week we put the clock forward or back an hour. These equinoxal tides are when the pull of the moon, the sun, and the Mirror are in line and give us the highest highs and lowest lows of the year. Any further explination can be obtained by sitting in a bath full of hot water and playing with your duck whilst sliding from one end of the bath to the other Mad Mike Quote Link to comment Share on other sites More sharing options...
blueboatdriver Posted November 23, 2005 Report Share Posted November 23, 2005 Any further explination can be obtained by sitting in a bath full of hot water and playing with your duck whilst sliding from one end of the bath to the other Mad Mike truly insane Quote Link to comment Share on other sites More sharing options...
jack Posted November 23, 2005 Report Share Posted November 23, 2005 And he did'nt mention double highs and standing tides [our own little area peculiarities ]... jack Quote Link to comment Share on other sites More sharing options...
Afishionado Posted November 23, 2005 Report Share Posted November 23, 2005 And he did'nt mention double highs and standing tides [our own little area peculiarities ]... jack Starting with the simple stuff first The double tide bit comes later with pictures too! Mad Mike Re truly insane.... I consider that I am the one looking in at the inmates! Quote Link to comment Share on other sites More sharing options...
Adam F Posted November 23, 2005 Report Share Posted November 23, 2005 Any further explination can be obtained by sitting in a bath full of hot water and playing with your duck Glad you spelt the last word correctly, once slip to the right on the 'U' - it could have a whole new connotation otherwise!! Quote Link to comment Share on other sites More sharing options...
Paul J Posted November 23, 2005 Report Share Posted November 23, 2005 Quote Link to comment Share on other sites More sharing options...
Paul J Posted November 23, 2005 Report Share Posted November 23, 2005 so you pull the plug for low tide and turn the tap on for high tide? Quote Link to comment Share on other sites More sharing options...
Gnasher Posted November 23, 2005 Author Report Share Posted November 23, 2005 cheers lads... very useful indeed. I know its all basic stuff 2 u lot, but im still a newby to boating, so expect daft questions. Im off to play in the bath now ...........with my duck. Quote Link to comment Share on other sites More sharing options...
Afishionado Posted November 23, 2005 Report Share Posted November 23, 2005 Any further explination can be obtained by sitting in a bath full of hot water and playing with your duck Glad you spelt the last word correctly, once slip to the right on the 'U' - it could have a whole new connotation otherwise!! Bloody hell is his bath big enough for a dock!? Mad Mike Quote Link to comment Share on other sites More sharing options...
Wedger Posted November 23, 2005 Report Share Posted November 23, 2005 Oooooooooooooch....... slipped a disc Mike, these practical manoeuvres to demonstrate tides in the bath can be painful ............ Quote Link to comment Share on other sites More sharing options...
Wedger Posted November 23, 2005 Report Share Posted November 23, 2005 Jeepers guys, If any of you try that demo of Mike's, for goodness sake make sure you stow the soap securely before taking action........... There should be an HSE report on this............... My duck is at the vets and my keel might be damaged Quote Link to comment Share on other sites More sharing options...
blueboatdriver Posted November 23, 2005 Report Share Posted November 23, 2005 I hope you cleaned the bath out afterwards; you wouldn't want to leave a tide line around the bath would you? Quote Link to comment Share on other sites More sharing options...
jack Posted November 24, 2005 Report Share Posted November 24, 2005 FROTH off,you SUDS !.. we dont want you all getting into a LATHER over this subject.Alyhough the subject is CLEAN enough,even for you SHOWER... jack Quote Link to comment Share on other sites More sharing options...
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