> The key point here is that its not a permanent construct, its using natural mechanisms to slow down wave energy and encourage regrowth of the dunes and littoral zone.
“A volume of 21.5 million m3 of sand, dredged from 5-10 km offshore, covered an area of 128 ha, spanning 2.4 km along the coastline and extending up to 1 km offshore. The sand was deposited in the form of a hook-shaped peninsula. Wind, wave and tide action were allowed to distribute the sand further.”
Another technique is used at Elmer Beach in the UK. Rock breakwaters are built with gaps between them. This means that the natural movements of sediment with the tides fills up the space behind them, ie between them and the shoreline. They also make for nice sheltered little bays.
A nice example of that is https://en.wikipedia.org/wiki/Sand_engine:
“A volume of 21.5 million m3 of sand, dredged from 5-10 km offshore, covered an area of 128 ha, spanning 2.4 km along the coastline and extending up to 1 km offshore. The sand was deposited in the form of a hook-shaped peninsula. Wind, wave and tide action were allowed to distribute the sand further.”
Since it was successful, the same approach was used in the UK, too (https://coastalsolutions.ireport.royalhaskoningdhv.com/13001...)