loco4viento wrote:Hi everyone,
I'm wondering if any of you have any successful experiences with anti-erosion measures in areas where longshore (side shore) currents are a significant contributor to sand dune coastal erosion. Have any of you seen successful measures which have resulted in actual sand deposition and restoration of beaches? I'm less interested in periodic beach nourishment and more interested in other strategies that may have been successful in areas that any of you might know.
Jetties work, but they cause erosion on the "downstream" side of the jetty.
Sand socks do not work and make things worse. The water carrying the sand hits the socks and reflects back causing erosion. Some of the things that do work are the things that are a matrix that catches the fast moving sand as it comes on shore and slopes up causing the sand to be deposited as the water slows down.
Here are some things that work
1) seaweed is really good for catching sand, but it smells
2) not having offshore submarine channels that trap sand that gets swept out from a hurricane
3) keeping healthy dunes with active vegetation.
4) fiber mats
5) artificial breakwaters