Environmental Engineering Reference
In-Depth Information
4.2.1 Sediment from Land Quarries
Sand and gravel have been obtained from quarries and trucked down to the
coast to renourish beaches in Monterey Bay, California and Ediz Hook on the
Washington coast of the United States (Sect.
4.3.1
, p. 61), Michigan City on
the Great Lakes (Sect.
4.5
, p. 87), Sidmouth on the south coast of England and
Redcliffe in Queensland, Australia. Black Rock beach, on the shores of Port
Phillip Bay, Australia, was partly renourished in this way (Fig.
4.3
). Erosion on
Bramston Beach in Queensland, was offset by bringing in 6,000 m
3
of coarse
sand quarried from old beach ridges (with the advantage that it had previously
been a beach sediment) a short distance inland and delivered to the shore by lor-
ries. The use of land-based sources of sediment for beach renourishment may
lead to problems with lorry traffic. The cost of using such sediment for beach
renourishment may also be too high where there are competing demands for sand
and gravel extracted from quarries for other purposes such as road making or
concrete aggregate.
In 2008 beach renourishment at Camber Sands in East Sussex, SE England,
used sediment from a nearby gravel pit (CIRIA
2010
), chosen as it provided a
number of advantages over alternative sources: the sediment was of similar calibre
to the natural beach sand, traffic movement was reduced, and the sediment was
cheaper than that obtained from other more distant sources.
4.2.2 Sediment from Other Beaches
Sand or gravel can be brought alongshore from other beaches, particularly those
that have been widened by progradation, to renourish a depleted beach. At
Aberystwyth in Wales the resort beach was augmented in 1963 by shingle brought
from a beach to the north (So
1974
). At Hvidesande, in Denmark, southward
Fig. 4.3
Sand dumped from
lorries on the shore at Black
Rock, Victoria, Australia.
© Geostudies
