John Gunn on Hydrology of the Castleton Area - all about Peak/Speedwell system. Not to be missed!
A very enjoyable seminar, and knowing that more remains to be discovered, especially after some of our recent traces, keeps the project very exciting. I had the pleasure of doing some work in the Bottomless Pit with Mark McAuley and Dave Shearsmith last year during one of the pulsing episodes, and it was extremely interesting to watch as there seemed to be at least two, and possibly three cycles superimposed upon each other - a long-period cycle of about 40 minutes with shorter-period cycles overlain - these were in the region of 4-5 minutes. The water in the Far Canal would rise up and overflow the platform, flooding it to about 5cm, and then drop rapidly again. The longer-period cycles were larger and would flood it to about 15cm for a longer period, but the shorter ones were observable during this time. The phases of pulsing seemed asynchronous to me, but watching it visually is not very accurate, admittedly.
Somehow I didn't notice this until just now! Anyone know the best way to contact John Gunn? I'm gutted that I missed it. Need the new material to distract freshers from their numb ankle sock'd feet when we're in the Peak streamway
Whilst we can speculate as to why the water does this or that, there is only one way to find out for sure and that’s to pick up a shovel and crowbar and start digging.
There is another way and that is to use technology. ...The technology is cheap and readily available.
Quote from: Mark Wright on March 09, 2021, 01:22:58 pmWhilst we can speculate as to why the water does this or that, there is only one way to find out for sure and that’s to pick up a shovel and crowbar and start digging.There is another way and that is to use technology. What is required is a number of devices, lets call them Captain Nemo. Each one is:- spherical, about the size of a ping-pong ball- slightly buoyant- containing a microprocessor, memory and some sensors.- sensors would be an accelerometer, a magnetometer, and pressure. - Bluetooth for location and interrogationYou would lob a handful in at Giants in pulsing flood conditions.Then you'd sit and wait in Castleton and fish them out as they float past. You'd lose a few, but so be it.You could then work out from the data:- Journey taken, how much was submerged, and how deep, and how much was in 'open water' conditions- Very approximate journey profile (double integrate the accelerometer data)- Direction of travelIf you added a microphone, you might also be able to tell if it was in open water by the noise. I guess it would be quieter when submerged.You would have to make it withstand pressures of at least 20 atmospheres.The technology is cheap and readily available.It would tell you an awful lot.Chris.
Wouldn't there be a significant issue with buoyancy?
I don't think so. Choice of housing material would play a part, but ultimately, it would just get bigger to ensure buoyancy.
DCA did have a plan in place to take folks from Historic England down on a winch last summer, and they said they'd do it, but Covid wrecked that - though I suspect it could have been done quite safely if they'd checked the dig one at a time. Oh well - maybe this summer! There's an online UCF meeting in a month, so it would be well worth having it as a discussion item. You could join in, it would be very useful.
Quote from: ChrisJC on March 09, 2021, 05:04:30 pmI don't think so. Choice of housing material would play a part, but ultimately, it would just get bigger to ensure buoyancy.I was thinking of situations where there may be fairly deep sumps where buoyancy could be problematic.
Isn't the bottom of East Canal also a deep gloop-fest with no obvious exit point? It's funny that it drains so well really, but there must be a lot more sediment going in off the bog than appears to the casual viewer. I have seen the water in the Crabwalk looking brown once, but it usually looks crystal clear - but I bet there's tons a year gets washed in there in reality. I'm amazed a frog can handle that sort of pressure though - isn't it like -70m down there?
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