Since 1999, Mott MacDonald has been responsible for monitoring
coastal revetments adjacent to Britain’s only coastal motorway on
behalf of the Highways Agency. In 2007 works continued with the
assignment to submit a full review of the condition of the coastal
revetments, including predicted rates of deterioration and options
for remedial or preventative works.
Revetment failure resulting in the exposure of
the underlying geotextile layer (August 2007)A number of
sections of the revetments were displaying evidence of significant
failure. Monitoring data, collected every six to twelve months from
1999 to 2007, was analysed to derive deterioration rates.
A hydrodynamic review of the study area was undertaken to derive
estimates of extreme significant wave heights for a 200 year-return
period. This provided the basic hydrodynamic conditions needed to
consider appropriate reconstruction of the revetments.
On site to the east of the A27 A2030 junction.
Gaps in the block work developed along the revetment where the toe
support was insufficient or missingA number of revetment
claddings were considered based on the underlying geology and
geometry of the embankment fill, a design life of 100 years, an
extreme wave period return of 200 years as well as environment and
economic constraints. The site is located within a SSSI a Ramsar
wetland protection area, a Special Protection Area and Special Area
of Conservation which all needed to be considered when finalising
the choice of revetment cladding.
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