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Shingle nourishment
If a suitable source of material exists nearby, beach nourishment with shingle
is a relatively easy process. However for successful and long term effectiveness
without other environmental damage occurring, it must take account of the following
points:
- Cross-shore and longshore beach response to nearshore tidal currents, the
long term wave climate and extreme storm sea-states which combine large waves
and high water levels;
- The risks (human, economic, environmental), both locally and along adjacent
frontages;
- The costs of the scheme, including initial placement and long term maintenance;
the availability of appropriate material (dredged aggregate, quarried gravel,
crushed rock) in the volumes required (both short and long term) and the influence
of different recharge sediment gradings on the cross-shore and long-shore
processes;
- The potential impacts of the scheme on the human and natural environment
(e.g. recreation, archaeology, nesting sites, fisheries, outfalls) (CIRIA
1996).
Comment: Major schemes are undertaken especially along the south
coast of England for
flood defence purposes.
Key References
CIRIA
1996.
Beach Management Manual.
CIRIA Reports, 153
Construction Industry Research and Information Association.
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