Tides, daft question but....

[Ankle.Biter]

When the tide is on the way down what compas direction (roughly) is the water traveling?


I'm only asking because I've been reading lots of articles about shads, down tiding using perks and uptiding and feeling the bite.


If makes a difference I fish off Sunderland. Normally amongst a million poorly marked crab pots !

 

[hulme6612]

I believe when the tide is on its way out it goes north, and floods south

 

[volante]

Ebb tide goes North and flood tides goes South, shads will be working in both tides except the slack waters (bacon sandwich time)
The best thing to do with pots etc is give them a wide berth especially around Sunderland,
some of the boats are using markers you dont see until your on top of them.

Davey

 

[oldessox]

Ebb to Edinburgh , flood to flambrough :red:, that's how I remember .

 

[Ankle.Biter]

Many thanks chaps, it's all starting to make sense.

I especially like the "bacon sarnie" time

I must get a little gas stove off Santa.

 

[lingking]

Ebb to Edinburgh , flood to flambrough :red:, that's how I remember .

nice one ray

 

[Kev1n]

Ebb to Edinburgh , flood to flambrough :red:, that's how I remember .

That’s how I remember it too!
Be aware that the tide changes direction about an hour and a half to two hours after low and high tide.

 

[The Jester]

Thanks for sharing the chart Kev, good bit of info

 

[northeast1]

It is a good chart Kev has put up he beat me to it. It is great when deciding what wrecks to fish as some wrecks i fish you can only really fish when the tide is either ebbing or flooding due to the lay of the wreck/snags.
I think i must be one of the only boat anglers that likes slack tide or no drift better than a 0.4 - 0.7knot drift

 

[big cod]

Remember once you are a couple of miles off and beyond off its upto 3 hours later then the tide book giveing high water on the beach.

paul.

 

[Ankle.Biter]

Remember once you are a couple of miles off and beyond off its upto 3 later then the tide book giveing high water on the beach.

paul.

Thank you Paul I had not considered the position off shore.

 

[phill_itofish]

Sorry to drag up an old post lads, but looking at the data on that sheet, does that mean if you just driffted for 12 hours you would more or less end up back where you were. Obviously not accounting for and wind or anything.

 

[Darnc]

You learn something every day

 

[Stores]

Sorry to drag up an old post lads, but looking at the data on that sheet, does that mean if you just driffted for 12 hours you would more or less end up back where you were. Obviously not accounting for and wind or anything.

Phil, I'm not back to "work" until Monday and don't have any angle thingys with me but I'll set it as a question for my 16 year old "not nice and not dim" group and see what they come up with.

 

[phill_itofish]

Cheers Dave, i did a quick sketch at work today but i didn't take into account speed. I might have another go tomorrow, while the boss is out.

 

[Kev1n]

No, in most cases you are unlikely to end up back where you started. The tides rotate around certain points and any land in the way will affect the uniformity of their flow. Further out to sea you have a better chance of getting back to where you started. Sailors crossing the English Channel often aim to completed a full tide cycle so for the first six hours of the crossing the tide flowing across their route takes them in one direction and for the second six, the tide compensates by moving them back in the right direction.

Stores, you could also start them on a few exercises like the ones the RYA Yachtmaster use. These require a student to combine the hour-by hour tide direction with a bearing that the boat is steering on. E.g. the boat is on a bearing of 090degrees and at speed six knots, the tide set is 000 degrees with set of 2 knots, how far from its original position will it travel? Ave speed? Etc. Also you can add in lee-way and calculations for compass variation and deviation if you want to provide a further challenge. Finally, ask them to calculate the heading (i.e. the direction the boat needs to face) for it to arrive at a certain point. Done on paper by drawing angle or use trigonometry to calculate. Then tell them to look up amphidromic points for more info on the tides.

 

[phill_itofish]

No, in most cases you are unlikely to end up back where you started. The tides rotate around certain points and any land in the way will affect the uniformity of their flow. Further out to sea you have a better chance of getting back to where you started. .

Ah if only id read this before i plotted it out lol.

Anyway here's what i came up with, based on the first lot of data on the table. (obvioulsy from what kevs saying, in reality this would all be wrong because once you drift for an hour the data will not be the same for that location)



Each Circle Represents an hour

Total Distance Travelled 6.944Km
Average Speed .0405 Knots

 

[Tadpoleman]

north tide going out = Nowt
South tide comming in = Sin
Thats how i remember.................

 

[Stores]

Interesting thread and interesting results from my group this morning.

Before we start, thanks Kev1n for your extension activities........but imagine the Bash Street Kids..........................

Anyway we reckon....

- none of the data gets you back to where you start, based solely on tidal movement:

- the first set of data would have an end result between 0.23 knots and 0.4 knots north of the start point, veering slightly to the west.

- the second set of data has the end result between 0.25 knots and 0.45 knots from the start, just fractionally west of north.

-the final piece of data has a result between 0.25 knots and 0.5 knots and it ends NW of the start.

Strangely the first and last tracks form a deflated Christmas balloon while the middle set of data is almost twice as long (north to south) but never gets wider than 0.15 knots.

As each set of results show an end result nearer the shore than the start I asked the students what they made of that...........nothing. I then prompted that anything lost at sea should end up where?....nothing. I then said the logical conclusion was that any body, cargo, whatever should end up on the shore somewhere (OK they say) - but it doesn't says I, reinforced with the fact that in 50 years of fishing I've only come across one washed up body and very little jetsam or flotsam - why?....nothing - something to take into consideration in the future when teenagers get into trouble on piers or inflatables or when swimming - kids from Cannock have no concept of the sea, how it works, what it's powers are or the consequences of getting things wrong.

At that point the Head arrived, cutting through my room. Happy New Years were exchanged and, as the kids were commenting on one anothers flow graphs he took an interest and I commented that he would know the answer. I explained the lesson, presented him with the problem and his first comment was "if this is the North Sea then the prevailing westerly wind will be more powerful than the tidal effect". The kids sat agog, the Head enhanced his reputation and I said... "not bad for an RE teacher"

Have passed the data onto the head of Maths and it's in the "Interesting Lessons" file