Revetment systems against wave attack : a design manual by Kirsty McConnell

By Kirsty McConnell

This e-book discusses the features of revetments and different facets of structural functionality. It contains instance requirements and calculations that permit the engineer to decide on the main solid, applicable and affordable revetment approach for a given state of affairs. The e-book courses the engineer during the layout approach, from determining hydraulic loading stipulations and preliminary dimensioning of the revetment components to special layout of the revetment components to make sure sufficient safety opposed to layout wave stipulations

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These impact pressures are very localised, normally at or below the Still Water Level. Wave impacts can cause brittle failure of rigid revetments. In the case of flexible revetments, where brittle failure is unlikely to occur, impacts over a number of cycles can cause fatigue and deformation of the revetment. 4. SCOUR The presence of a hard structure can increase wave and current velocities in its vicinity, which in turn causes increased movement of bed material. This can manifest itself as local scour at the structure toe.

The likelihood of sliding can be increased by the occurrence of uplift pressures on the underside of the revetment, reducing friction between the cover layer and the filter layer. For blockwork, Pilarczyk et al (1995) show that just before the wave hits the structure there is an increase in piezometric head close to the water line. It can be assumed that this increase effectively acts over a height of the revetment equivalent to the wave height. This piezometric head indicates the occurrence of uplift pressures and as a result the loss of frictional resistance between the blocks and the slope.

Those used for revetment filters fall into two categories - woven and non-woven. Woven geotextiles are usually manufactured from continuous filament synthetic yarns orientated along the length and across the width of the fabric. Such materials tend to be reasonably 'stiff, with low extension under maximum load (say 15 20%), quite thin (< 2mm) and have a high robustness / weight ratio. e. stable under loading, which can lead to a change in its pore size, therefore affecting the filtration efficiency.

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