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Solent double tides Thread starter dancrane Start date 21 Aug Joined 29 Dec Messages 9, Seems very strange to me, and I daresay to others, especially visitors. Seems odd to me! It isn't actually a Solent thing, it is to do with being half way down the English Channel, exaggerated because of some of the features in the Solent - there are similar effects over on the French side. They aren't really double tides, the tide "stands". Joined 19 Sep Messages 18, Uricanejack Well-known member.
Joined 22 Oct Messages 3, I'm not fammilliar with the Solent. It is a Channel inside an Island with two seperate outlets to the sea a significant distance apart.
I live on the Inside of Vancouver Island. The Tides are odd. Some times it falls rises a bit then falls a lot. The reason being the topography of the Island and Islands affect and restrict the flow of water in from the two different directions. Near Calshot, the tidal regime and bathymetry of Christchurch Bay results in a double high water. Further to the east, around Spithead, changes in the relationship between the tides and bathymetry results in an extended rather than double high tide.
In Southampton Water, the tidal characteristics are exaggerated by internal resonance within the estuary, this results in a 'young flood stand' and a double high water period with little change in water level. At hrs on 10th March , a coastal storm and spring tides led to one of the highest High Water Tides ever recorded in the Port of Southampton.
A bank in the centre of the Solent, Bramble Bank, is exposed at low water springs. For anticyclones the water will be about 1cm less deep for every mb above mb. In storms the corresponding increase in water height due to the low air pressure may be increased further by a storm surge originating in the English Channel.
NTSLF forecasts of departures from the tide table values are available for one or two days ahead, but the accuracy depends on the accuracy of the weather forecast. Currents in parts of the Solent are strong see photo taken at Stansore Point and can reach 3 kts or more.
The tidal stream "diamonds" on Admiralty Charts do not capture the rapid spatial variation which often occurs approaching the shore lines. More detail still is shown in atlas form in various commercial publications. A very detailed, animated view of currents in the Solent and Southampton water calculated using a numerical model can be viewed on YouTube and predictions for specific days can be obtained from various commecial web sites by subscription.
A simulation of currents around the Isle of Wight and currents in the Solent between Cowes and Lepe by the research branch of ABP shows how they change during the period of a spring tide. NCI is not responsible for and cannot vouch for the accuracy or availability of the data sources and forecasts linked to from this web site.
NCI watchkeepers provide the eyes and ears along the coast, monitoring radio channels and providing a listening watch in poor visibility. They are trained to deal with emergencies offering a variety of skills and experience, and full training by the NCI ensures that high standards are met.
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