Could this work: Storm Surge Wall

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I have wondered if it's possible to build a wall on the coastlines, that can be activated when a storm is forecast to strike a given area, then deactivated when the storm surge threat subsides. The wall would rest on an elevator underground, then raised or lowered either by crank or motor.

Have a look at the Thames Flood Barrier which is intended to do something similar but on a small scale.

Sounds like Trump's Wall, but with moving parts.

Doesn't sound very feasible.

The Thames thing guards a specific river.

How are you envisioning this thing?

To run along the whole U.S. Gulf, and Atantic coasts?

Or just for certain cities?

I'm not sure the feasibility of a mechanical device like this is very practical or cost effective.

There are static structures in place near oceans and rivers known as dykes or levees. They are basically a hill that runs alongside the watercourse and prevents flooding with higher than normal water levels.