Just in case no-one else has written an explanation: the phenomenon is called drawdown. As a vessel passes and blocks part of the waterway, because the cross-sectional area is reduced, the water speeds up to get past. From the conservation of energy principle, as the kinetic energy of the water has increased, the potential energy must decrease, so the water level drops, causing the drawdown. From the ship's point of view, this is called squat. Strangely, en.wikipedia.org/wiki/Squat_effect is quite misleadingly explained and the diagram is wrong.

This causes big problems with erosion in inlets that are used as passageways for large ships but are sheltered from ocean conditions and wouldn't naturally have large swells impacting the shore lines, it seems like a trivial thing but because the natural conditions inside an inlet are very calm and gentle the shorelines are made up of very fine sediments they are fragile it doesn't take long for ship displacement swells and waves to erode large amounts of shoreline sediments away.

That demonstrates the displacement caused by a large passing ship perfectly. Great video

I would never have guessed that a ship so far away could cause this.

Crustaceans below the water mark suggest this to be a tidal region anyway. The video is a bit nauseating but brilliantly shows the erosion risk of commercial shipping lanes in narrow waterways.

You do realize that the only difference between this and a tsunami is scale, right?

That was cool, seeing the water rushing back in so quickly.

That is in Corpus Christi Bay and the ship is passing under the Harbor Bridge. The naval ship to the left is the Lexington AirCraft Museum.

It's really just the ship's movement through the water that creates a forward moving wave, the wave's energy corrals the water in front and sides of the ship. Once the ship passes the water on the sides of the ship collapse forward from gravity without the ship no longer occupying the space. You can easily reproduce this effect by filling your bathtub up with water and grabbing anything that floats and slowly push it from one side of the tub to the other. You will see the water in front of the object is higher than towards the rear until you stop moving it. The wave you created loses its energy when you stop moving the object, hence, the water quickly returns to its initial state.

This is between the Tx St. Aquarium and the USS Lexington on Corpus Christi. The ship channel is 60 feet deep and the area surrounding it is 8 feet deep. Lots of big waves.

This is the same phenomenon that almost caused the Titanic - New York collision in 1912, as the former vessel was departing Southampton.

Why does the water go down? If you fill a bathtub halfway, and get in the tub the water level goes up.

Swing the camera faster

That's amazing.

Displace the water? Displacing the water would raise the level of the water. When a boat is put in a bathtub, the boat displaces water and the level in the tub rises. What causes the water to be sucked out. It’s not displacement.

This is cool. Crazy how the boat is big enough to displace the water even in a huge body of water like this. Also, who are the 393 people that disliked this video? Clearly you hate your lives.

Solve rising sea levels. Remove all ships from the oceans! I’m very smart

I thought it was going to be a giant massive Vhs videotape with a water displacement documentary recorded on it.

I bet you this video was taken on the Side of the Corpus Christi bay Bridge on the side where the USS Lexington is permanently Moored alongside of the Texas State Aquarium. I have been in that building over the water MANY Times. As a matter of fact; I was Friends wuth the people who owned tgat building in 1971 through 1981. I fished from the inside of the boathouse they had underneath it. It was once called the Boathouse Restaurant, and The Boathouse Grill. It is directly across the street from an old motel which was once called The Lynn Motor Inn. You could read it from the tpp of the Corpus Christi Harbor Bridge. I have been there many times in my lifetime. It seems such a short time ago that I used to fish from the Jerry where the USS Lexungon is now moored.

I live along the port of houston ship channel amd they have probably 50 to a 100 big ships that come in and out of there everyday and everyone of em do that to the water level. But of course its probably 80 to a 100 feet deep too.

What is happening is that the propellers on the ship are actually sucking water from around the hull and pushing it out behind the ship ... the surrounding water moves towards the low pressure area around the hull to replace what is being drawn away. As the ship passes, the high pressure area formed behind the ship, spreads out back to its normal neutral pressure state - thus the water coming back to shore.

Nice video. Fascinating stuff

There are many shipping lanes in the uk where you can almost touch the ships going past

Nice vid. Would have liked to see more of the Navy ship to the left but pretty cool film. Thanks.

Washington state. Lummi island has a low beach that they had to slow ships and super tankers down as the wakes would wash across the beach the road and into the first floors of homes there.

I cant understand this phenomen. Why the sea level goes down? When the ship has weight and push water of same weight. Its wave or what?

Get a tripod and leave the shot fixed. More interesting than whipping the camera around.

Ya learn something new every day! That's amazing

I wonder what makes draining near shore land, when billions of gallons of water on sea' ? Maybe the motor engines rotation so fast that siphoned water from distance. I wonder if a navy OSN siencetist could explain for this. I learned something new today about natural earth. Thanks for sharing this education video. Try ask the weather meteroligist about this and see what can he say.

I just can't wrap my head around how something like this can make the water level drop. Is it not the same as putting ice cubes in a full glass of water?

That tugboat is losing the tug-of-war. Big time.

twin 26 foot dia. props pushing 60 or 70 thousand tons of ship can move a lot a water.

IDK what is up withe comments man, I was able to see quite easily that the water level was going down. Also, people can use the gear icon to speed the vid up if they want. Nice vid

Again. Thanks for watching. Always looking for new friends/subscribers. Always willing to listen to comments or new ideas.

It's not displacement, it's called the Venturi Effect. The big tanker is dragging water along with it temporarily lowering the levels along the shore.

whats the problem ? all water goes up and down It does it quick for you let me know the problem sir

Which war ship or aircraft carrier is that to your left? and which state is this in?

This is nothing more than water seeking it's own level. Big ships are pushing massive quantities of water. You can try this at home the next time it rains. Find a puddle and run a shovel thru the puddle. The shovel will push the water causing the water level to drop behind the shovel. As soon as the pressure caused by the shovel (think ship here) has passed the water returns to normal level. Basic physics on a large scale. Small boats do the same thing, but because they are small it's not noticed as much.

Is this in Corpus by North Shore? Check out the video I posted on the Port A side at bulkhead. Surfs up.

dude i love massive water displacement videos on youtube

Is this in Charleston, SC?

Stupid question but why is the water retreating like its going out and not in

Done a lot of fishing up where the lift bridge was- it was real bad up there

WHISKEY TANGO FOXTROT Where does the water go and why?

was that a air craft carrier to the left

Why it doesn’t happen where I live? Big boat like that everyday.

Good to get some fresh oysters lol

Remember to flush twice as its a long way to...........

Random KZfaq video than bam right there in front of me the USS Lexington. Now I'm going to have to go down there and watch as the next big ship goes by.

That's where i live!!!! That's by the Lexington

Yup, that's what the tide does every day

man the crabs and whatever stuffs be living inside the sand near the beach be like , " excuse me, where the fuck is water ? man, we can't have shit in Detroit "

Who flushed?

careful, waves can push you into sharp barnacles

I first saw title thought Rosie O'Donnell was taking a swim ... lmao 🤣

AMAZING! Was like a planet passed only 150,000 miles! Thank you so much for posting this valuable and fascinating video! Such a contribution to society! Your IQ must be at least one standard deviation below the mean! Cheers!

Wow you deserve a gold medal and can i thank you on behalf of all You Tubers for this breathtaking spectacle

Looks like Corpus Christi ?

Exactly 40,000 tons of water rushed back behind the vessel. It's called Archimedes principle. That's only 40,000 cubic meters of water. Not much really!

then theres a huge navy ship casually sitting on the left

looks like the best place to get crabs😂

Did anyone else get dizzy? nice job spinning your phone around

see it all the time living on tybee island no big deal

Ok how does a ship a half mile out to sea cause that change

Petrol: Powering the world of today and the dreams of tomorrow! Saving billions of lives a day. What's in your fuel tanks?

Wow, scary amazing. Instant low tide almost 🤔😎

I AM getting sea sick watching this!

I wonder were that's at

Those poor water lizards.

The best place I've ever found to watch this is a small beach Northeast of Portland called Reeder Beach on the Columbia River.

Good video.

water displasment from justin y.

How did you get so close to a military naval ship without being arrested?

Did i miss something?

Please hold the camera steady next time and it may be more apparent what you are trying to show.

Wow...... massive.

Whoa the carrier in the back!

This video gave me the best idea ever: We can stop the rising sea level caused by global warming just by having a few more of these ships sailing around. On local scale it’s most likely to prevent tsunami’s as well. Am I a genius or what!

nice haircut !

what's wrong? only water ...

That's why I prefer showers not baths

need that oil son

How the heck can we see anything substantial.... waving the bloody camera around doesn't help!!!

I know where you are. I’m gonna go watch this happen there now haha

wow crazy stuff lol

🙌🙌🙌 thank you

And this is in my recommendations because...........

Corpus Christi, i know the USS Lexington when i see it 1:49

Massive! No way.

Quick give all the fish a straw to breathe through

Perfect place to swim. Bring your trunks next time! Maybe even a beer or two.

I've seen more displacement from a belly flop.

The propeller is sucking the water out

My daughter, 4 years at the time, were washed into the Columbia river by back wash of a container ship. I was 8 months pregnant at the time. Terrifying.

If you had held the camera still, or perhaps kept your mitts off it entirely, I might have seen what you wanted to show.

please check out more of my videos. thank you so much for watching

I cant find an explanation of why this happens. Anybody?

Wow.....

Makes you wonder how much the sea level is rises because of all the world ships🤔

Very interesting and I felt like I was there with the slight motion sickness from the camera. 🤣🤣