Overtopping failure of a large-scale artificial dam in Taiwan (Feng and Chen, 2012) - Part 2 Surge
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- Опубліковано 27 тра 2013
- The height of the man-made test dam is 4 meters. The dam was built in the Huisun experimental forest of National Chung Hsing University (NCHU), Taiwan. The water overflowed the dam at 8 min 25 sec (08:25) of this video. The video was recorded by Prof. Zheng-yi Feng of NCHU on April 10, 2012 around 9:30 am. Prof. Su-chin Chen of NCHU established the dam for a group research on landslide dam failure mechanism supported by Taiwan National Science Council. The copyright of the video file is owned by Prof. Zheng-yi Feng and Prof. Su-chin Chen of NCHU, Taiwan.
Observation of this dam failure:
1. Due to the shooting angle from the downstream and steep sloping of the creek bed, we cannot see the water rising during impounding at the upstream side.
2. The inflow from an upstream canal was about 1~2 CMS.
3. Water is seeping out from the bottom of the dam since 00:10.
4. The seepage water gradually increases with increasing water level.
5. At 08:25, start of overflow.
6. A small "alluvial fan" was formed till 10:35 by the eroded dam materials.
7. The dam breached at about 10:45 and the surge wave front traveled downstream.
8. There is a peak flooding discharge/stage can be observed.
9. The dam was eroded horizontally and lowered gradually.
10. The flash flood due to the breach lasted about 1 min 15 sec.
11. and others.
By Prof. Zheng-yi Feng on May 12, 2012, e-mail: tonyfeng@nchu.edu.tw - Наука та технологія
I don't know why I enjoy dams breaking. It's like watching a fire you can't take your eyes off.
That dam was designed to fail for the camera, it was never meant to hold back water.
good job
This comment was designed to fail for UA-cam, it was never meant to read the description.
I see that their engineers are as good as our North American ones
It is not a "large scale artificial dam". It is a large scale model of a dam.
It says that in the description
I had trouble seeing the height of the water overflowing the dam - - - glad it was a test dam.
With so much flowing under I'm a bit surprised any made it over. Good demonstration of the failure though. Oroville had a go at doing that on a major scale.
Yes but Oroville did it on purpose to let the water gradually flow instead of one big rush to prevent damage down the line. There’s a documentary on here I just watched last night.
True.
Back in the day, before the housing developments, we had drainage ditches and cow pastures. I loved building little dams to see if I could (obviously temporarily) divert the water.
I promise that no salmon were harmed in the process.
The Perspective is all screwed up on this, they could have picked a better angle to film from.
From an engineering perspective, all thew interesting stuff usually happens on the downstream face of the dam.
I thought the same thing!
@@mastermasonjoewillis3904 I kept waiting for the water level "upstream" to rise too.
Tilted to the left, guess their camera bubble was busted.
From this angle the dam looks empty.
Awesome Camera Angle as it captures all of the Key Features of the Failure and Collapse
A very good learning tool.
My best friend, You Great Good... !!! I wish you every day of your development. Best Relaxing +thumb up3!
That was fascinating to watch how it failed.
It's amazing what the trolls find to post their comments about. Apparently folks don't read descriptions when they don't understand. I did.
Read? You expect people to read???
@@daneclark3161 Expect? Not any more, actually. But we can always hope.
Your mom read the description.
...exciting...yet interesting veido ...thank you...
Thanks for the video
I wonder if those people on the opposite bank were aware of the quite severe danger they were in, due to the rapid erosion. Why didn't the others on this (camera) side try to warn them?
there is no way this dam overtops.
8:25 i stand corrected.
Great video. Thanks for posting
Human: spends hours building a dam
River: spends 4 minutes going back to normal
Nice!
"Chen! Get the shovel!"
I believe it's real. I've done a bit of nature photography and pictures/video never look as steep as reality whey you shoot up slope like that. I feel the camera is well below the level of the lake. The way the people are walking looks like they are on a slope. The view of bridge, car(?) and what I assume is the road off to the right all seem consistent with viewing from a low angle. I will say, at first viewing something seemed very wrong...'where does the water come from?' I thought. It made sense when I placed myself below the dam looking up slope.
Dear friends:
We did many dam breach tests in the past years since May 12, 2012. Recently, we have published a SCI original paper in Landslides journal with two time-lapse movies for the dam breach and slope erosion test performed on November 1, 2018. The paper is: Zheng-Yi Feng, Hao-Yang Huang and Su-Chin Chen* (2020) "Analysis of the Characteristics of Seismic and Acoustic Signals Produced by a Dam Failure and Slope Erosion Test" , Landslides, published online on March 19, 2020. It can be accessed at rdcu.be/b3kv6 or doi.org/10.1007/s10346-020-01390-x or contact me.
Best wishes,
−−
Zheng-yi (Tony) Feng, Ph.D., P.E.
Professor
Department of Soil and Water Conservation
National Chung Hsing University
145, Xingda RD
Taichung, 402
Taiwan
web.nchu.edu.tw/pweb/users/feng/
e-mail: tonyfeng@nchu.edu.tw
here's 15,000 years of experience of being allowed to exist.. YOU WILL NEVER CONTROL GRANDMOTHER EARTH!! your study of water and nature consists of a few hundred years experience...our elders can teach you more than all your teachers and science combined..your soil and water conservation is a joke.. you people can't live in the bush of the land for a month..you've just put a new spin on how to destroy what ensures our existence ..
......super video......👍💓👍💓👍
👍💓👍💓👍thank you............
I dont understand how the water overflows when its much lower in the background (i did read the description still dont understand how, just searching for explanation).
From what I can tell the angle of the camera makes it appear as though that is a smaller slope than it actually is. I wondered the same thing and started to look much closer at the background. The bridge in the background does not look quite right so I suspect the angle of the video is misleading a little bit.
we are testing artificial dams too, but only at a very little scale and for fun!
every time we eat mashed potatoes with sauce the members of our whole family builds on each dish a potato-dam and fills it with sauce. then the eating begins, wich dams lasts the longest is the winner! ;)
WELL GOLLLY, we does that SAme thin here, But we youse the Reel stufff, GRAVOX, now some like it theck, an some like it hot, but me l like mine theck an hot an lotsa of it, they best bits are the choco sprinkles in the mash, so we alla looking for youres and ours at the same time..
Belly laugh at all the people who don't realize this was an engineering research experiment studying the dynamics of dam failure. Which, by the way, is a very hot topic in Taiwan.
This couldn't be a structure intended for permanent water retention. It must be a "failure experiment".
TheDodgeboi Yes. It was a scaled study for dam failure done by University class.
I don't think that the dam was meant to hold back anything. There was a steady supply of water coming down so do you think a pile of gravel is going to hold the water back any longer than enough time to build up for just what you have seen?
It can not be fake. It is just because the video was shooting from downstream toward upstream. The slope of the stream bed is steep and can not see the water while it was impounding. We do many tests and have taped many other videos.
+Tony Feng It *IS* fake - i.e. photoshopped. The water behind the dam never rises even close to the top. There is a clear line where the water appears out of nowhere. And, if the stream is as steep as you claim, why are the people standing on the adjacent road not standing at an angle? They are standing almost 90 degrees to the road and the road is perpendicular to the stream. Thumbed down for being fake.
+Barry Foster I believe that the failure of the earthen dam in this engineering experiment is similar to the failure of your powers of observation and analysis: first there are some leaks through the "grey matter", and then it is simply overwhelmed.Read up on earthen dam failures- this is exactly how they happen, and how they look.
+Barry Foster If you look up a valley from below, the people will appear upright. As the camera is to one side (not directly below them) the people have a slight lean (which they do).
I agree this ist no fake you can See the Watermark when the dam collapse
Look Guys, The Prof did not have a 30 foot Camera Tripod.
No spillway? Let’s stand closer and get the rest of our town to join us.
Why spillways exist.
Things get interesting at 8:23.
The embankment next to the people eroded so much that it posed a potential danger of collapsing and throwing them into the water.
Tens of gallons of water falling on the unsuspecting daffodils at the bottom of this very non-steep hill was traumatic. Oh my heck!
The height of the water coming over is lower to what you see in the background where the bridge is at so how does it overflow, water cannot flow upwards
Learn to read video descriptions.
@@woowooNeedsFaith ooh pardon me for breathing don't get cocky
@Mark Pearson
who's talking
08:25 start of overflow.. ur welcome
hard punch don’t worry about the criticism..it was still funny.
And I do thank you!
starts at 8.30
people saying this is fake have no idea what they are watching.
yes , it is always a surprise how stupid some people are !
Am I the only one thinking that the water looks lower behind the dam right before it over tops?
How can it overflow if there is no water behind it at that level. Plus the sound of water flowing is clear water while in video it is muddy
Perspective.
“The sound of water flowing is clear water...”. whatever....
The camera is slightly below the water level (poor camera placement, if you ask me, but then they were interested in capturing phenomena at the top and face of the dam). The whole setting is on more of a slope than it appears at first -- note how the people are leaning.
water is relentless
Looks very odd.
Not sure what the purpose was, but it is evident that the dam was not going to be a permanent structure. As soon as the seepage started at the 00:10 mark, the dam's fate was sealed
+Randy She.... not so much true BUT dirty water seepage VERY bad
this was an experiment. Read the description. The seepage was not the cause of the failure. Overtopping and supercritical flow on the downstream side of the dam caused the failure
Roses are red, violets are blue, I didn't search for this, and neither did you.
Starts at 8.20
They got some kinda special anti-grav water over there in Taiwan?
Breach at 8:25
10:40 Major failure occurs
Halloween 2020 comming up and it looks like it was the bugs in silent hill coming out of the dam
⏬👍
Video begins when you click on another video. Thank me over there.
the water is trying to find the path of least resistance within the dam which in this case is going to be UP through the earthen parts of the dam ....the force of the water exceding that of gravity . Why did they ever bother with this ?
They do this so civil engineering students can see theory being put into practice
Need to mention "test" in the summary/heading. I think the students/professor need to think harder BEFORE even carrying out this test. I am not even half an engineering student but I thought it would not work just by looking at the "material" used to construct the dam and that at this chosen test site LOL the dam is already seeping water at the start of the video.
Undermining of this rockpile started as soon as water reached it.
mmmm gravel dam, great idea!
+Runehorn
They were studying landslide dam failures.
Skip ahead to 10.30 to see the big whoosh...
Why would they put rocks instead of like concrete!?!? Edit: (to make it more understandable) They could of added concrete there. EDIT ONCE AGAIN: Oh, they were experimenting it. I should of read the desc.
Yes, you should HAVE done all that, instead of wasting time/bandwidth.
I'm not sure about your title, I think a dam, by definition, is artificial.
Unless you're comparing it to one of those natural dams that grow across rivers???
Start at 8:30
I was sleeping and this came on. I thought it was someone frying bacon
It is overtopping, not overturning.
+Quinn ik Who cares
+Quinn ik or as we say in N.Z. Australia & England over flowing !
My MY aren't we a bit sensitive !!! Countries always start with a capital letter ...
Watching April 2023
I find it very surprising the embankment kept eroding after the river was flowing at level. When building dams you need to build into the embankment not on top of it or against it this is the result.
The water looks like it's appearing out of nowhere.
Hey! A dam is about to break and we’re all standing on dirt! Let’s take out our cameras and film! It’s amazing how long the human race has survived..............
Have to wonder if the guy on the left at 12:17 has a clue of what's happening right below him.
It would’ve taken you and the three troglodytes who voted your mind numbingly stupid comment two seconds to read the caption, but I guess reading is tough.
Dam ordered on Banggood.. no Refund
Large scale?!? Our beavers make larger dam than this small thing.
Réal Morrissette I was gonna say just that!
Not even a high dam judging from the height of the guys standing there and the erosion mark on the side.
That's NO Dam! That's a pile of dirt in a wash!
and what the difference between ''' a dam failure'' and ''a over-topping dam failure'' ???
The same as the difference between '" a comment" and "a UA-cam comment"
The dam fell apart even faster after the water reached the top thus proving the basic theory of all dams the force against the wall will keep it in place but once the top is breached you get the two forces compression and expansion at the same time
They use concrete for dams and concave walls because the concrete will push against the side walls keeping it in place thus the dam expands slightly as the weight of the water pushes against the wall but once the water tops you get water compressing the dam for which it was not designed for
A dam must never breach the top henceforth why most dams start releasing at 95% of the capacity but that is a slow release the amount of water there after can be controlled
The difference between a minor oil leak and an oil filter blowing out from too much oil
Not sure why that was there to begin with. That wasn’t a damn it was a pile of gravel and rock. It didn’t really even serve to hold water as it was porous.
If that is a "Large Scale" Dam i wonder what a smaller scale dam looks like, probably big enough to barely deal with the water run off from rain going downhill in a street gutter.
A small dam is called a weir the difference is a weir is only meant to slow the flow not hold back the water
Where I live the Old Oak creek weir is 50 ft so it is a large weir but has little to know water in it for most of the year
damn
I'm not an expert, but the water is already flowing underneath the dam, if that's not a sign nothing really is....
Stones don't hold back rivers ;p
Tiger Woods would call that construction material "loose impediments".
Very demonstrative. Also a stupidity test for trolls, apparently.
read
Glad to see you back here again tony, still looking for "trolls" ?
Gravel dams never work. Old concrete driver.
You can tell that to every city and town between Fort Peck Montana and the gulf of mexico someday.
Can't all you "experts" at least get the technology right! It is not being "filmed." Nothing is "filmed" any more. This is being "recorded" electronically!
It seems like an engineering student study. How to not build a dam.
read
My post was an answer to the others prior, who appear to think this was some sort of hoax etc.
@@greenriver520 srry :) have nice day. that was a lot of work for a school project. think also the ok permit to do by the city/foresters.
Cheers @@thomaspyefinch7394, I think they did well. The only way to learn is to get out there and do it. The theory then makes sense.
@@greenriver520 i use to build plastic model ships when i was 13-16yrs old. had a small creek, 2' wide, in woods behind house where i would play with the models. broke the aircraft carrier into parts, but kept flight deck in Farley good shape. the 4 planes could take off still. made a dam using dead branches moss and muck. i had fun.
large??!!
13.2' isn't anything to snarl at r p/p. That was a lot of water behind it.
rock available cheap downstream
If you wanna get it right ask a Beaver.
there's plenty of that over there if you have the dough
A gentleman never expects to pay.
I'm really not sure what is happening here but this is DEFINITELY not overturning failure....
in the Film is not enough water behind the Damm to break him
I want my 25 minutes back.......
I was expecting more damage but it was childish
What's the Chinese for " Dam Useless? " Lol.
This was a demonstration of how dams fail it was intended to fail from the start to dissect the results for teaching engineering students to avoid building bad dams.
Darn I guess that don't work out now did it lol
This is not a large dam. Geez, a few trucks full of dirt and rock and a bulldozer could make that in a couple of hours. It was not a permanent dam for sure. Looks like someone just made if for fun before the rains hit an obvious river.
I figure one could say all dams are artificial. I have yet to see one that was not made by man or animal, which makes them artificial. If it were made by nature is would surely overtop and wash away.
8:32 you’re welcome!
I think this video is a Fake The water level on the upstream side of the dam never reaches the Dam Height - In fact in never changes
I SOOOOO agree with you.
Composite photo
Four meters is not "large-scale." Looks fake to me.
Why are people just standing there for. Do something! Fix it.
Not a proper dam pile of stones
Well, that obviously didn't work.
A TEST DAM, IN 2 SECONDS I KNEW IT WOULD FAIL AND WHERE AND HOW IT WOULD FAIL
x
This isn't large scale, it is incompetently built of porus materials.
I judging 5im
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