Brian Gaff presented the following explanation :
I'm just wondering why nobody has used the column of water and pumping
something with its rise and fall type of power generation. It would not
matter what direction the pressure waves came from but would need a very big
column in a hostile see to make it viable.
Brian

I suspect the constant and rapid reversal of the flow would make the
system very inefficient - just too rapid for the mechanicals to
respond.