Losing beach sand due to a storm is a known phenomenon. Various beach protection schemes do just the opposite of their intended action. The water hits he barrier and returns to sea with high energy, taking more sand from the beach than it brought, effectively eating the beach away. In cliffy areas with houses on top this is particularly dangerous. In my country there is an ancient town in danger of being taken down by the sea.

The solution: a multilayered net floating in the water near the beach takes some of the energy on the way in and some on the way back leaving the sand. Once the storm is not in full blow pull the net up a little higher for the next time, and shovel the sand to where it is desired.
-- pashute, Sep 04 2017

Tsunami prevention https://www.cardiff...-tsunami-prevention
[2 fries shy of a happy meal, Sep 07 2017]

I think you would have a net loss.
-- AusCan531, Sep 04 2017


Surfers will have something to say about anything that ruins their surfing spots.
-- normzone, Sep 04 2017


I keep saying this, if you construct a series of perforated air pipes around a beach area, then aerating the water during storms will mitigate most water damage and prevent erosion.

On a larger mega-scale it should prevent tsunamis. They would just fizzle.
-- 2 fries shy of a happy meal, Sep 04 2017


[2 fries], the thing that best stops a tsunami is a long stretch of shallow water off-shore. Remember the 2004 tsunami in the Indian Ocean? One of the nations least affected was Bangladesh, despite it being a just-above- sea- level country, because that nation surrounds the mouth of a major river, and silt deposits from that river have created a huge area of offshore shallow water.

The aeration thing might be good against storm surge, but a tsunami is basically a consequence of most of a whole ocean sloshing, and typically involves vastly more water than a mere storm surge.
-- Vernon, Sep 07 2017


This would turn into a massive pile of seaweed, algae, and dead fish in a hot hurry.
-- RayfordSteele, Sep 07 2017


Interesting.
For a while there was talk of creating enormous chutes to redirect a tsunami upwards but I'm having a hard time finding anything about that now.
The latest notion is about using acoustic gravity waves to perhaps cancel an incoming wave. [link]
-- 2 fries shy of a happy meal, Sep 07 2017


I think a better solution would be to bond the beach with a polyester resin, much like they bond gravel driveways. Admittedly, it would make sandcastling difficult; and if the ratio of polyester to sand was too high, the entire beach might float away on a high tide; but these are minor issues.
-- MaxwellBuchanan, Sep 11 2017


// anti beach erosion sand net //

Would not "Beach sand anti-erosion net" be a more concise and descriptive title ?
-- 8th of 7, Sep 11 2017


But that wouldn't mean the same thing - I assume this is an "anti-beach" erosion sand net - i.e. an erosion sand net somehow for the purpose of destroying beaches. I admit I haven't yet read the text of the idea though, so may be wrong.
-- hippo, Sep 11 2017



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