TiggerToo
Well-Known Member
Is there anywhere one could see high resolution charts of the tidal streams in Poole Harbour?
Poole streams
- Thread starter TiggerToo
- Start date
Pete7
Well-Known Member
How about the tidal diamonds on a chart on Visit My Harbour.
http://www.visitmyharbour.com/harbours/channel-west/poole-anchorages/charts.asp?cattype=5
http://www.visitmyharbour.com/harbours/channel-west/poole-anchorages/charts.asp?cattype=5
TiggerToo
Well-Known Member
nope, I already saw those. I was interested in the streams of the other places with no diamonds, e.g. the channels south of Brownsea Island....
LadyInBed
Well-Known Member
I've never seen a tide stream chart for PH but around Brownsea you will note that the bouyage changes, indicating a change of the 'Flood Stream' direction.
DJE
Well-Known Member
I seem to remember a pilot book somewhere saying that Poole tides are "Almost unpredictable at neaps". I normally assume that it goes out for 2 hours before low, it comes in for 2 hours after low and then it just sloshes about for 8 hours. Never been far out.
colhel
Well-Known Member
I find the main channel is predictable enough for my needs, but elsewhere is a bit hit and miss to say the least.
GrahamD
Well-Known Member
I don't know if there is a detailed tidal atlas for the harbour- I've not seen one. For the direction of currents in the entrance the Poole Entrance tidal curve is a pretty good indicator. There is generally a 45 min time lag between the time of HW at the entrance and the quay at Wareham, other parts of the harbour can be interpolated.
Round the back of the islands the direction of the tidal flow generally follows the channels. Tidal flow in the main (Middle) channel is fairly straightforward, linked to the tide table curve, but the Wych Channel can turn at different times, which have become more difficult to predict since the Middle Channel was deepened to take bigger cruise ships and ferries. In the North Channel a large eddy current builds up on a strong incoming tide.
Although there is a relatively small tidal range, the tidal height is above the mean for 16 of the 24hours.
Round the back of the islands the direction of the tidal flow generally follows the channels. Tidal flow in the main (Middle) channel is fairly straightforward, linked to the tide table curve, but the Wych Channel can turn at different times, which have become more difficult to predict since the Middle Channel was deepened to take bigger cruise ships and ferries. In the North Channel a large eddy current builds up on a strong incoming tide.
Although there is a relatively small tidal range, the tidal height is above the mean for 16 of the 24hours.
