Wave tank demonstration showing the impact of coastal defences on flood risk

The JBA Trust wave tank shows how different combinations of coastal defences and wave and tide conditions affect the potential for overtopping and flood risk.

Over-topping rates can be measured for the following defences and conditions:
- beach during a storm surge
- vertical and recurved sea walls
- stepped and sloped revetments
- rock armour
- submerged near-shore breakwater

Please use, share and adapt this resource with attribution to JBA Trust.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

[InstaSound]

I guess I'm interested in coastal defence now

[Alovatololo]

The recurve wall is the uno reverso card of walls.

[JoSeph-qogq]

News: huge tsunami is reflected with a huge uno reverse card

[lexderp]

Engineers: puts a ramp up for the water
Ramp: makes it easier for things to get up
Engineers: *:O*

[ParallaxRS]

I don't even know why this was a suggested video for me, I saw how long it was, and thought 'Nah I'll probably close it after 30 secs' - Here I am at the end of the 12:22 wanting more experiments. Really good video and interesting for someone who had no prior interest in this.

[jamesnw]

Not click bait, and straight to the point, and I learned something throughout the whole video without having to wait for the very end. The rest of YT could learn a thing or two instead of wasting people's time. ;)

[Brachwah]

Never thought I'd be watching a 12 minute video on wave defenses. Great work.

[Hatecrewdethrol]

7:05 I always wondered why the border between the sand and parking lot for Ocean Beach in San Fran had those huge concave walls. Makes sense now.

[vinnregi]

At like 40% in the video i thought "why not just make a wall with a curve to throw the water back in?" And then you showed the recurve wall!
But that submerged breakwater was mind blowing! I don't know if it has any environmental effect, but on the aesthetic part (+ defence ofc) its 10/10!

[AliothAncalagon]

Let's just appreciate that its something educational this time that appeared in our recommendations.

[fxtly]

Anyone else used to make waves in the bath as a kid and put action figures and boats in it and pretend it was a tsunami

[rickmisnich]

The part of Japan I lived in must have been a test bed for wave suppression, because you could see examples of each one of these defenses. Every few km was a different strategy. My home was about 200 meters from the "beach." As you came to it there was a ~3 meter tall wall that has a cool mural of the town's local legends. Beyond it was a wide trench, followed by another wall, beyond which were hundreds of these gigantic concrete "jacks" which acted as a rock armor. They moved a lot more though. It really felt like we were at war with the Pacific.

[joops]

I live in The Netherlands in an area that was reclaimed from the sea, we live about 4 meters below sea level. All that seperates us from a massive wall of water is this kind of technology.
Very interesting to see it up close!

[Necrobin]

I did not expect the recurved wall to work that satisfyingly well. :o

[AshishSingh]

The simplicity with which this guy presents each method is appreciable

[henyr]

Don't mind me just ruining my sleep squedule watching waves at 4 am

[KyleLi]

When I first started watching this video, I thought it would be some boring engineering jibber jabber and not cover anything, but the results actually were super interesting and I felt like I learned something new... will definitely be looking at beaches far differently now!

[xezwrui]

I’m a landscape architecture student working on projects related to mitigating extreme storms and rising sea level. This video is extremely useful and scientific that gives us a handy support of our designs, thank you so much!!

[karlwolf]

I've come back to watch this video like 4 times over the past few years and somehow it's still fascinating to me.

[sploofmcsterra]

I didn't realise I was interested in this.