debris flow - 22 août 2011 - Crue torrentielle à Saint Julien Montdenis

[@dalewright3667]

This mud flow is what occurs in high mountains and rain storms. Truly Awesome display

[@WesleyAPEX]

What causes the water to lower and rise like that? It’s very unusual. It kept coming in waves.

[@SvendleBerries]

Im no expert, but I would imagine it could be a couple different things: Either its a few different rivers coming from the mountain that all condense into one, and every river upstream surged at a different time. Or it could be that debris clogged up the river in a few places and then dislodged releasing the water that built up behind it. Or it could be a combination of both. Thats why Im glad I dont live anywhere (relatively) close to the mountains or a river lol

[@janelindley1345]

S

[@rudyrobles9902]

@@SvendleBerries No m B B but am No B am M ex in

[@alexandre.modesto]

it's just the erosion of the mountain The rock is very schistose

[@mary-ruthflores4107]

I’ve seen it do the waves when much further up, the erosion will breach a section and widen the channel, releasing more water and mud

[@GlobalistJuice]

Major credit goes to the creek/channel/wash/trench engineers, who had the foresight to build that thing bigger than what might seem necessary.

[@vladimirvlad2563]

I bet there are some construction rules when it comes to building something like this.You can't just throw in some materials and make it over.

[@Metal0sopher]

Not foresight but centuries of it happening every spring. This is a regular yearly thing.

[@serhiyranush4420]

@Raphael Royal Actually, no-one gives a phuck.

[@WELLINGTON20]

It’s normal.

[@Indiangaming-oc2du]

kzbin.info/www/bejne/m5CWnqigmt6gbcU

[@jiveturkey9993]

I like how well-engineered the channel is. It looks rough and all but it handles it so well. It's rough appearance seems like it would get gouged out but the opposite seems to happen.

[@16Galatv]

X 🇹🇷 💛♥️ 🤍🖤 💜💟 🤎💙 💚💖 🇭🇺 X

[@eily_b]

Wow, I've never seen a mud debris coming down a mountain in waves like that. Impressive.

[@rhondalamb7053]

It is the speed bumps they put in to hold it back

[@jawadad73]

that and temporary blockages of debris, trees and large boulders slowing it down momentairly and then getting deblocked by the mass of water slammin into it.@@rhondalamb7053

[@bg147]

What a beautiful country. I love how the canal is lined with large rocks on the sides and tiles on the bottom. High quality and charming. Everything here in the US is concrete.

[@streetsafari0]

Horses for courses. They use the material that is around them. Getting concrete to some of these areas is expensive, especially when you have plenty of stone to us. And in certain places high stress places, they will use plenty of concrete.

[@pepino735]

what would be interesting to know is how when and why they built that spillway, great!

[@Reviloj]

Amazing. Watched through. Again. Weather is fascinating. The stonework of the trench was well done. Kudos to those standing on the bridge. That would've made me a bit nervous.

[@NoNORADon911]

Man that water/soil looked fertile, could grow some good stuff with that I bet

[@mmacrini]

That is a well-engineered drainage system. Wow.

[@robertheinrichvonseyfenste267]

it is NOT!

[@luminescence9949]

@@robertheinrichvonseyfenste267 why’s that? Geht auch auf Deutsch

[@bryangreenway]

Brilliant, love the way the lady just glances down & walks off - she’s seen it a few times . Has channel ever overflowed into the town?

[@johnmca5643]

She was nicely dressed....

[@paulmanson253]

At a guess,overflow in this part of the world has happened since the end of the Ice Age. And as long as there has been a human community in that valley,there has been some mitigation effort. That flume required a lot of work,effort,materials,design, etc. When it was done,what the preexisting structures were,no idea. But there would have been something.

[@sixstringedthing]

What a stunning part of the world. The sound and sense of force and power when each wave of debris build up then hits the hydraulic jump in front of the footbridge is quite incredible. I'm trying to imagine what this might look like and the damage it could cause if somebody forgot to build the steps into the channel and it was just one long straight chute. Scary!

[@kamaruddinlazim5434]

pqq

[@kamaruddinlazim5434]

pqq

[@user-tb2jy9lu3d]

What causes it to come in waves like this? I've noticed the same phenomenon in videos in California storm drains where it gets taller with each subsequent wave about 15-30 seconds apart. What's the cause of that?

[@laurencefausold5555]

Debris temporarily piling up the flow then breaking up, causing the surges.

[@DrDeuteron]

A classic instability[1]: deep water flows faster, overtakes the water in front, gets deeper, flows faster, gets deeper, flows even faster, until a hydraulic jump forms, stopping the increase. Trailing water is shallower and flows slower, until it is overtaken by the trailing hydraulic jump. You usually see it in thin films flowing down flat surfaces, but here it's on an impressive scale. [1] maybe a "hydraulic toe jump instability" related to the Froude number (ratio of bulk flow speed to small surface wave speed).

[@MacStoker]

i was enjoying the flow above the flow but the camera operator cut out the best 2 minutes lol

[@101snuff]

La grande classe d'avoir pu filmer ça !! Normalement ça se fait à la webcam et les gars qui étudient ça n'en voient jamais en vrain/vitesse réelle ! Magnifique

[@ModelingSteelinHO]

Well done. Not to many videos of this type of debris flow. This is the absolute best video of debris flow dynamics on you-tube . Excellent video ! What a beautiful country too.

[@chrisrebar2381]

what is the source of this mud? What is the source and reason for this culvert that has obviously been there for many years?

[@LevieuxRacknar]

Magnifique vidéo merci 😘

[@feth7747]

GREAT videography work: the camera takes the action, and no viceversa.

[@alexandre.modesto]

thx

[@MrDrums76]

wow! that is awesome! its cool how you can see the different surges of water coming down through teh canal. and thats a beautiful country by the way.

[@meruliouslacrimens5154]

When seen like this, you can understand how poor water magement can destroy villages further downstream especially with what is borne along with it.

[@rossbrumby1957]

By how the flow comes in waves, I'm guessing it's a controlled release? Would indicate a catchment of some kind above, maybe to absorb extreme downpours to avoid overflow of a too small drainage channel?

[@alexandre.modesto]

no, it was after a thunderstorm. All this is natural, what breaks the energy are the rafters (stairs) that cut the energy and make the mud not accelerate

[@craigmad-doganderson9042]

Great footage of this event! Well done! 😎

[@boahnation9932]

What's causing the flow to increase and decrease like that does anybody know?

[@alexandre.modesto]

The answer must be in fluid dynamics

[@user-tb2jy9lu3d]

Interesting how it has a random pattern. Starts light, then heavy, then a really heavy wave, then appears to slack off, then gets heavy again, then light, then heavy.

[@jays106]

jmr1068204 that’s what happens when too many people finally flush at taco bell 😂😂

[@billiebleach7889]

jmr1068204 you make it sound like a relationship that turned into marriage

[@vrbrozov]

I, too, found this fascinating, so I googled it. Turns out the formation of surges in the flow is a natural phenomenon that occurs when debris slows a wave down and other waves pile up behind it. The drainage channel has to be long enough and the contents of the flow must be a particular mixture of debris and liquid for this to occur. Reference: agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2005RG000175

[@user-tb2jy9lu3d]

@joe Domjan That's a reasonable theory. I have also considered that since water takes the path of least resistance, maybe it rained really hard, then slacked off again, then started raining really hard again and kept repeating. It would cause it to have quick gaps and slower flow and then come back again.

[@detroitjohnson7625]

@@billiebleach7889 lol

[@RockGeek00]

This debis flow control channel is pretty neat a bit further down the it becomes a bridge over a highway before reaching the Arc river.

[@alexandre.modesto]

Yes exactly

[@kay110]

I can understand where it comes from (mountains, rain, mud/rocks), but where does it end up? There must be a lot of it to clear away after the storms have ended.

[@jonnyalexguti9935]

Well, where does the water go when the normal channel is, under the paving stone? because there at the beginning of the video I see the normal cause but the water cannot be seen passing under the bridge where is the cameraman

[@alexandre.modesto]

I am on the bridge and the water goes well under

[@theheyseed]

impressive, where does this empty out into?

[@ashitaka13400]

Wow très impressionnant ! Juste par curiosité, comment avez-vous su que la vague allait arriver ? A quoi sont dues les vagues successives ? Y a-t-il un barrage en amont ?

[@shardamagar9161]

Which country is it? Looks beautyful

[@alexandre.modesto]

France, Saint-Julien-Montdenis

[@knobsdialsandbuttons]

Awesome footage ! 👍

[@frankneumann3776]

Würde gerne einmal wissen warum das Geröll in solchen Wellen kommt und nicht wesentlich gleichmäßiger ? Lieben Dank für eine Antwort.

[@alexandre.modesto]

Ich denke, die Dichte des Schlamms ändert sich, und wir haben ein Schichtungsphänomen. Ich schätze ... da müsste man Spezialisten fragen

[@termineitorgenesisbu2951]

That's having a good water blur that's thinking about the future and without garbage that obstructs it

[@staudtj1]

O.K. Whos backyard does THAT drain into??

[@cgcgundersen]

Post 10 would approve of this....

[@15secofFame]

If that flow stopped Post 10 would have jumped in with his rake ready for action!

[@IGbullshark]

@@15secofFame Are you kidding? He'd be in the trenches long before the flow stopped

[@josesalvador3106]

@@15secofFame qj

[@tymz-r-achangin]

Whats "2 minutes plus tard" or do we need to ride the short bus to know what that means

[@laxman.mshettigar7738]

Why is it coming in waves? I am curious to know the reason behind this.

[@alexandre.modesto]

This is a very good question, which must have its answer in fluid dynamics

[@mathuetax]

Wow! That was impressive to watch!

[@hoppeltrottel7484]

I love the mountains, but I also have much respect. They can be a terrifying place.

[@peyo001]

Why exactly is this happening? Is it to relive pressure or is it to clean the canal..where does all that silt and debris go? Can't say that I have ever seen something like this before..strangely interesting.

[@gav1233]

Why does the camera have a fisheye lense?

[@alexandre.modesto]

Zenitar 16 mm 5 D mkII

[@Свободадляроссии]

Where did all that water come from

[@thomasash8896]

Where does it all go?

[@alexandre.modesto]

sea

[@Jack10250]

Anybody can explain me why the debris is coming on waves?

[@rosaiselmorslesfuentesmora6587]

Impresionante esto es por lluvias o es de origen volcánico. Saludos desde Panamá 🇵🇦

[@nanakwamedickson4296]

Is this a mud or debris flow?

[@NimishP]

Where is it? The town looks beautiful. Sounds like, this passage is specifically designed to channelize the debris.

[@yvesd_fr1810]

+Nimish Parikh It is in the French Alps. Coordinates 45°18'42,757'' north / 6° 20' 27,884' east

[@alexandre.modesto]

+YvesD_fr Saint Julien Montdenis : www.saint-julien-montdenis.com

[@JasmineLindros]

I disagree with the earlier post. I believe this bridge is at 45d15'26.07"N, 6d24'9.04"E.

[@MonthlyFailsVideoResearch]

Hello Alexandre MODESTO, would it possible to contact you regarding one of your videos i.e via mail? I would love to discuss a permission to use it if this is possible. Greetings!

[@Adhamkehmour]

Comment vous saviez que l eau allait arriver ?

[@carmencorrea5722]

Que agua preta vem de onde?

[@birdali2]

Why does it come in waves like that?

[@PacoOtis]

It appears there is no attempt to capture some of the water. Why is this?

[@accqpqp2339]

debris from where

[@i8allthepies2]

What causes the pulsing is there a damming structure upstream or is it debris causing temporary damming

[@SkengManNZ]

at a guess bottlenecking then breaching.

[@81eagle]

Nice riffles, wonder if there's any gold deposited in them after an event like this.

[@aamirabdulsalam]

WHICH PLACE IS THIS ?

[@Syrnian]

That would be Saint Julien Mont Denis, France. I do not know a lick of French and could figure out that the location is in the title.

[@spookaup]

Very good quality!!!Can you tell me what camera do you use?

[@hebneh]

I presume this is a flash flood caused by rainfall in the mountains - ? 1) Why were there clearly-defined surges in strength and depth? 2) Where does all this silt and rock end up - in some sort of holding pond?

[@Syrnian]

How many corpses did you spot?

[@chips493]

Je ne comprends pas, où passe l'eau qui ruisselle au début? Rien ne coule sous le pont.

[@KatherineRivera-zk2jb]

It's creepy and beautiful at same time, thanks from Puerto Rico 💋💋💋💋

[@U.S.President]

Why it is like burst after burst ?

[@garlandremingtoniii1338]

Does anyone know where this is at????

[@SuperBajafresh]

WOW! Thanks for sharing. Wow!

[@JdamRekt]

In my years of expertise in the industry the reason why this happens is because i have no clue what I'm talking about.

[@jimfritz9503]

And you said it very well. No wasted words.

[@andyguyuk1]

What causes the surge's

[@skatpak2967]

where does all the black water come from??? it looks so nasty..is it mining waters?? wow cant believe you would stand there and film!! scary

[@remi-tl5lp]

Cette "boue" est dû à l'érosion rapide d'une ancienne carrière d'ardoises , elle en a bien la couleur, et de l'entourage sans végétation qu'on peut voir au loin sur la vidéo. J'ai été chercher sur Google maps , ( très facile vu l'hydrographie du lieu) pont de la D 79, une pancarte indique le circuit des ardoisiers, un chemin des ardoisiers longe ce torrent, qui se jette dans L'ARC plus bas, appelé Ravin de St Julien a été renforcé , et apparemment cela résiste très bien, renforcé pour son passage " en ville" il me semble, plus haut c'est nature. Belle vidéo et son bruit, le top= aucune musique polluante comme on voit souvent. Impressionnante la vague arrière qui va plus vite et qui rattrape la première en lui passant au dessus laissant voir au début les deux pas encore mêlées.

[@alexandre.modesto]

Le bassin versant est un peu plus grand que juste les carrières aux alentours. Mais c'est effectivement de la roche schisteuse

[@remi-tl5lp]

@@alexandre.modesto Merci de la réponse !

[@screwsnutsandbolts]

Wow !. Incredible catch !

[@richardsimpson3136]

This one is on here in at least 8 Different Videos! It's a DEBRIS FLOW as a result of a FLASH FLOOD up in the surrounding HILLS!

[@alainrenaud8869]

Phénoménal, très très impressionnant !

[@alexandre.modesto]

Tout cela en quelques minutes..

[@bdis89]

Does that happen normally there?

[@RoseThe82]

qu'en sera-t-il cette année avec les très importantes chutes de neige durant l'hiver 2012-2013 ?

[@zayravargas4286]

Where are? Hi from Puerto Rico.

[@TheCatAteMyShoe]

That was incredible to watch the surges.

[@thecommentwhisperer4360]

What country is this in?

[@alexandre.modesto]

France

[@delight6662]

Swiss ingenuity is so impressive.

[@yvescarron328]

Thanks, but it's in France

[@Kanoee64]

That was cool Thanks for the video.

[@ismaliastabile6128]

Lama vulcânica, seria isso? Tem vários vídeos com lama dessa cor.

[@lilianlisoficial]

Neve derretendo no início da primavera.

[@atigerclaw]

Reminds me of a choose-your-own-adventure book I read back when I was in, I think middle school. At one point in the story, you've been captured by villain and you're enroute to their base/lair and you have the option to escape the transport into the jungle. Escaping is fatal. One option after you escape is to try and navigate the jungle, and results in you getting caught in an army ant migration and by morning your bones are picked clean. The other option is following a gully... You hear a rumble of thunder from a storm in the distance and pay it no mind. Then, a few minutes later, basically this video is why it was a bad idea to take the gully.

[@roberioqueiroz365]

parce que cete eau est-elle comme de la boue ?

[@alexandre.modesto]

Oui et une énorme densité

[@emptymaker9752]

Find any gold after the water has stopped?

[@cricri6624]

C'est bien joli par chez vous !

[@sonic1045]

When ever a bigger wave come down the water or muck get very low. Then the big. one come again @ 1:13 the muck start coming down .... @ 1:24 @ 1:55 @ 2:41 @ 3:06 or @ 3:07 @ 3:17 @ 3:37 @ 4:20 @ 4:45

[@edbroaotearoa1198]

Your drains are prettier than our cities royal gardens

[@jonnizero88]

E pra onde vai está água toda ?

[@stuinNorway]

Down the hillside.

[@gustav250777]

Amazing video, well done.

[@lemmecheck01]

Go to 1:10 time stamp for the actual mud flow.

[@Mojave888]

Cool subject, great photography and landscape!

[@tag7100]

Found this spot on Google Earth. Less than a half mile after this point is an aqueduct over a highway, running parallel to a road. You can go to Street View under the bridges and see the difference in how strong they each have to be. But I'd like to see footage of this river dumping into the next one downstream.

[@macauleyholmes6403]

Go pro ?

[@liugng71]

They are sometime 2 layers of the flash flood.

[@josephsheranda]

This happens every time the neighbors have tacos for lunch. 😛

[@donniecatalano]

They must be extremely cheap, low quality tacos 😂

[@maiwald6293]

Was ist das ?

[@MrDjjeanjean]

Bravo d'avoir pus filmer ça :)

[@Bass-ne6dl]

I wonder where that ends up

[@hectorpascale1013]

The channel ends 1km behind his filming location in the the main valley of the Maurienne region in the River "Arc". This river flows into the Isère near Albertville (Olympic WInter Games 199x), through Grenoble, meets the river "Rhone" near Valence, which flows south towards Marseille reaching the mediterranean sea.

[@duvanhuertas4871]

From?

[@DadbrosGarage]

what a beautiful place

[@rsuku8836]

Super video.very nice Sukumar India.

[@rilluma]

where that comes from?

[@catherinemcfadden5477]

rilluma I’m thinking mountains

[@GeoEstes]

I wonder why it comes down in surges.