Many areas in the Gulf of Mexico experience these types of tides.Ī semidiurnal tide cycle occurs in areas that experience two high and two low tides of approximately equal size every lunar day. how come some places in the world have weird tides I hear you ask?Īn area has a diurnal tidal cycle if it experiences just one high and one low tide every lunar day. Here in NZ we have two high tides, and two low tides roughly every 25 hours or so.īUT…. So effectively the tide as we know it is the result of a combination of various separate tidal bulges caused by a particular set of Earth-Moon-Sun circumstances. Then if the lunar high co-incides with the solar low tide, they effectively cancel each other out to make a neap tide – or a smaller high and smaller low – or less range.
When both the lunar and solar are high at the same time, they effectively combine together to make a higher range – this is a spring tide – higher highs and lower lows. So when doing a tidal prediction, the experts combine both the lunar tide with the solar tide, to come up with a result. This all has an effect on the height of each tide. During it’s orbit, the moon’s distance to the earth changes as does it’s angle. The moon is of course closer to us than the sun, so the lunar tide is dominant. So there is effectively a lunar and a solar tide cycle. Their gravitational pull on earth basically causes the water to bulge out towards the celestial bodies. Well the sun and the moon are the main culprits. So what causes the tide to rise & fall and why do certain places have a larger range than others? It also creates crazy currents when sailing through narrow channels, these currents are responsible for many of the grey hairs that I am now sporting on the top of my head…! Sadly the tide came in and as I was sitting on the back of my boat I saw my pre-made bonfire floating past. I also once collected lots of wood on the beach to make a big pile for a bonfire later on that night. Our club is spared that hassle and we are an all tide venue, however Corsair Bay where Wildwood lives is quite shallow, and I have hit the mooring block before on very low tides. The tide here in Christchurch dictates when many clubs can sail as they are located on estuaries and can only sail a couple of hours either side of high tide. (big drama, diesel bug in the fuel tanks, and we had to throw out the anchor to avoid being blown on to the rocks) we were stuck, and the tide was going out and we needed high tide to be able to get the boat on to the cradle. That was what the haulout manager reminded me when we had broken down on the way to to be hauled out.
0 kommentar(er)
