Groynes are pretty effective but they have one major drawback. The new beach will increase the distance that waves have to travel to reach the coast and, in the process, they’ll lose most of their energy, reducing their impact. The idea of groynes is to capture sand that moves down the beach via longshore drift and help build up a larger section of beach in front of an area that’s experiencing coastal erosion. They’re low lying wooden walls that extend out to sea. Groynes are relatively soft hard engineering techniques. Once built however, they don’t require as much maintenance as a sea wall (Source: Geography AS Notes). Revetments are normally successful at reducing coastal erosion but they are expensive to build. Revetments can be modified so that they have rippled surfaces, which further help to dissipate the wave energy. The revetments absorb the energy of the waves, preventing the cliffs from being eroded. They’re slanted and act as a barrier against waves not too dissimilar to a sea wall. Revetments are concrete (or in some cases wooden) structures that are built along the base of a cliff.
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