NOT NEW, better quality ~15 mm/6h/St.,dont/davon 10-15mm/h/St. la dernière demi-heure/letzte halbe Stunde (~~selon pluviomètre.., radar encore en confinement ?…)
I'm impressed that the concrete walls hold up that well - several years by the look of it - I wouldn't have thought they'd survive getting blasted with that much force more than once before crumbling and ending up in the Rhône themselves...
For the English speaking people some information about the place: The usually small and inconspicuous Illbach quickly swells during intense precipitation due to showers, thunderstorms or the combination of meltwater and rain and carries a lot of debris due to the continuous intensive weathering of the rock material. These debris flows occur several times a year and carry the material down into the Rhone. When it rains, this leads to the clouding of the Rhone up to its mouth in Lake Geneva. The stream has thus cut 1,500 metres into the rock and, together with the material, piled up a huge cone of debris in the Rhone valley. As a result, it was pressed over a length of 5 kilometres to the opposite foot of the mountain. The cone of rubble is heaped up to 200 metres above the valley floor. The eastern part of the debris cone is farmed with meadows and fields, while the western part supports the upper part of the Pfynwald forest. The lower part, on the other hand, is still characterised by the regular debris flows, some of whose material here is washed away by the Rhone as far as Sierre. Due to the strong erosion there is no permanent vegetation in the Illgraben [1]. Protective measures Edit Torrent control Edit After devastating mudflow events in 1961, a comprehensive protection concept was developed and implemented for the village of Susten. This consists of a dam as the main barrier, which is intended to stop the largest masses of debris, and 29 other smaller barriers.
This video is amazing and terrifying. Just a reminder for anyone tempted to drive through moving water, it only takes two inches of flowing water to make you lose control of your vehicle. Moving water is one of the most powerful forces on this planet. Respect it and stay safe. Oh, and WEAR A MASK.
That's not just water. Water doesn't move 4 ton boulders like that. That's more the consistency of wet cement from a mixer. But heavier. If you were to fall in that, your body would be pulverized by the rocks and gravel suspended in the mud.
@@grantcook5376 Sometimes less, depending on your speed. The tyres tend to draw water under them and break contact with the road. Alway drive slowly to dead slow through water.
Another great vid from you. Thank you very much. Is it possible to see in future vids from the ending of the Illgraben in the Rhone? It must bei impressive to see the big waves flush into the Rhone
Are the spillways built to slow the speed of the water ? Probably a DUH question, but some engineer came up with the idea! Just amazing seeing the huge bolders being swept down!
I don’t really, but I kind of wish there were something in frame to show the scale of this. I mean I know it’s big. But how much bigger than a car 🚙. This just amazes me.
Usually, big rocks are 4 m long, very big 5 m and I saw one which is 6 m that I called Mecalo, which arrived on 22.07.2016. At minute 13:12 it must be 4,5 m long. On my other video seen from another point of view of this debris flow, I saw a rock that I called "Little Boy" which is 5,5 m long.
@@pierre-emmanuelzufferey1470 Out of curiosity, the "smoke" coming up from the bottom of the falls is from breaking rocks? Friction? Is it steam? Thanks for this mesmerizing content.
@@barr2644 Breaking rocks. But must be some tempertaure also, but not to build steam. I suppose in huge event like in Ronti valley this spring, when very high temperature, the smoke must be black, dust from breaked rocks breaked ice and steam.Some happend in Bondasca, witnesses saw a black dust coming very fast, and a huge noise followed..
Pierre-Emmanuel, what government group is responsible for maintaining these debris flow paths? what maintenance is routinely done on them?, do they occasionally use heavy equipment to clear the routes out and use the dredged material for road building or construction fill?
Bonjour Moi j'ètais à l'iillgraben 2fois en ete, mais pas de descente de laves torrentielles, Par contre j'ai vu le parcours et tout les materiaux , C'est magnifique. Comme j'habite vers Yverdon les Bains ( un peu loin) À quelle moment je pourrais y retourner pour voir 1 lave torrentielle? J'aimerais vraiment bcp, Merci pour les vidèos magnifiques 🙂
What they are suspended in is a slurry very much like liquid concrete. The pulverized rock and mud increase the power of the flowing water by orders of magnitude to the point where it can toss around boulders weighing dozens of tons. The power in a flow like this is kind of terrifying.
Where do the larger rocks go? They fall over the edge and are never seen again. If there is a hole, it must be huge because there were a lot of rocks and a lot of massive rocks.
You just have to watch closely. In the mud that flows on, the big rocks are also inside. Sometimes something just lingers at the end of the flood. But ultimately everything ends up in the Rhône river.
I don't understand why there was not a huge pile of boulders at the base of the concrete waterfall at the end of the video. The boulders were falling straight down so at that point so there was no momentum or water behind them to keep pushing them forward. Was that text on the screen at 9:35 saying the boulders were being crushed?
@@englishruraldoggynerd It's powdered rock caused by concussion. If you get real close after the flow then the bubbles that rise out of the mud are full of dry powder. It's a bizzare thing to see. The dams are there to do exactly as you described, reduce the energy in the flow. The channel in the foreground .
Philip Jones So, do you mean the bubbles were formed by cavitation bubbles? I thought they only formed inside tubes under pressure, but.... of course, the water would form a solid I guess as it falls in the weird way hydrodynamics work. Which is way beyond my understanding of physics. Thank you for answering!
Where do all the rocks and mud come from? It seems like this structure was made to channel the rocks and mud, what happened to cause so much erosion? Thanks!
It goes in the Rhône, some big rocks stop in the channel, but at the end, after other debris flow, it ends in the Rhône. Sometimes the hole debris flow stops in the channel. Look at my video, Illgraben, le chaos granitique éphémère,...
Down from the Illhorn, a triassic formation (limestone, and moraine debris of the ice age). Going into the delta of the Pfynwald, and taken away by the Rhône.
Here the answer of Woody615 The bottom layer of the water/debris has more friction between it and the ground, thus it slows down. The upper layers of water don't have as much friction so it moves faster than the natural flow rate. The water behind it can't keep up, so a gap develops and a new "wave" forms from the next bit of water, thus if forms a wave cycle with the friction. My answer is that this come from the breathing of the earth….let the earth breathe. Other say that it is the difference between volume arriving and volume going down...the video Illgraben 04.06.20 Lave torrentielle/Murgang/Pont Bouthanais/Bhutanbrücke is the some event but from a point of view 2 km above, there the waves are less evident.
I was watching these and other flash floods all day sunday and today i got caught in a big flash flood on a mountain in chiang rai.....that google spyware is getting too damn cocky.
The stones and blocks are hold by the mud and are broken the one against the other. Of that result a white dust, and also a sulphuric smell if you would assit to it, apart from the cataclismic noise. It happens when the mud the some density has as the stone.
I noticed that too, I thought it was ice the way it seemed to be floating, but when they didn't pop back up I realized they were rocks, and they were staying at the base of the damn. There must be rocks and silt piled up to the top of the damn on the upstream side, and that's why the rocks are able to be pushed over.
They are under the water from that point. The purpose of the dams is to reduce the energy of the flow. Otherwise, it would keep going faster and erode the banks very quickly. The rocks also crack and break up. That white cloud you see is stone dust. A seriously bad place to hang out.
