Coastal protection using gabions should be limited to a secondary defence in exposed areas or a primary defence in sheltered or estuary locations.
The protection system can be as a retaining structure or as a revetment. In all cases, only PVC-zinc coated gabions should be considered, as zinc or aluminium-zinc coatings are susceptible to corrosion (however if the structures are temporary then these coatings can be considered).
Due to the imposed forces created by breaking waves revetment slopes should not exceed 1 in 3 and quality of construction is very important. Units must be packed tightly otherwise stone movement within the basket will occur resulting in abrasion of the fabric of the gabion.
Adequate consideration must be made to toe scour, whether it be a retaining structure or a sloping revetment, otherwise failure due to undermining will occur.
Advice should always be sought for each situation. |
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