Tidal Regime Flashcards
What is the spring tide regime for Southampton?
5 metre tidal range
Floods for 2 hours
Young flood stand for 2 hour
Floods for 3 hours - 1st HW
Ebb/slack for 1.5 hours
Slack for 1.5 hours - 2nd HW
Ebb for 3 hours - LW
What is the neap tidal regime at Southampton?
1.5m tidal range
3 hour flood
2 hour slack
4 hour ebb
3 hour slack/slight flood
What is the young flood stand?
2 hours after LW the flood slackens off considerably for 2 hours before an accelerated flood tide
What causes the short ebb tide?
The double high water coupled with the young flood stand result in a long flood period leaving only 3-4 hours for the ebb. This results in a faster velocity ebb current.
What causes the double high water?
The friction, irregular depths and width restriction of the English Channel prevent the water flowing freely and cause additional HW/LW oscillations producing the double high water experienced at Southampton.
What causes the early Westward turn of the tide in the Solent?
The tidal range East of IOW is double that of the Western IOW. When the Eastern end tide becomes higher than the Western end, a westerly tidal current develops 2 hours before the actual HW.
What is the Southampton tidal regime at Dockhead?
Mean HW spring 4.5m
Mean HW Neap 3.7m
Mean LW Spring 0.5m
Mean HW Neap 1.8m
Where are the tide gauges?
37 Berth
Calshot
Marchwood Pile
Ocean Dock
