Abstract
A dynamic revetment is a gravel ridge constructed around the wave runup limit to mimic composite beaches which consist of a lower foreshore of sand and a backshore ridge constructed of gravel or cobbles which stabilises the upper beach and provides overtopping protection to the hinterland. These structures contrast with static coastal defence structures as they are “dynamic†and are expected to reshape under wave attack. The performance and resilience of a dynamic revetment under sea level rise (SLR) for a range of wave conditions was studied in a large scale laboratory flume. This work provided new information about the application of such structures for coastal protection in the face of a rising sea level.
Highlights
A dynamic revetment is a gravel ridge constructed around the wave runup limit to mimic composite beaches which consist of a lower foreshore of sand and a backshore ridge constructed of gravel or cobbles which stabilises the upper beach and provides overtopping protection to the hinterland
The evolution of beach morphology with an incrementally rising sea level over long, multi-day test runs was measured for both a sand beach and a sand beach with a dynamic revetment
The analysis of the particles transport demonstrates that the probability for a cobble to be transported landward from their original position is significantly higher than seaward transport
Summary
A dynamic revetment is a gravel ridge constructed around the wave runup limit to mimic composite beaches which consist of a lower foreshore of sand and a backshore ridge constructed of gravel or cobbles which stabilises the upper beach and provides overtopping protection to the hinterland. The performance and resilience of a dynamic revetment under sea level rise (SLR) for a range of wave conditions was studied in a large scale laboratory flume. The analysis of the particles transport demonstrates that the probability for a cobble to be transported landward from their original position is significantly higher than seaward transport This rolling over process prevents the revetment from sinking dramatically and eventually increases the crest height
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