January 13, 2004
14:36
WSPC/101-CEJ
00094
553
Progress in Management of Sediment Bypassing at Coastal Inlets
4.1. Spur functioning
A jetty spur can be constructed to reduce sediment from shoaling navigation chan-
nels at coastal inlets. The spur acts as a deflector of sediment-laden longshore cur-
rents developed from breaking waves, wind and tidal currents and actually functions
as a deterrent to prevent sediment bypassing the jetty. Spurs are usually constructed
of rock rubble similar to the adjacent jetty. The basic function of a spur is to alter
the path of the sediment-laden longshore current and contain or divert the sediment,
a)
b)
c)
d)
Fig. 13. Examples of jetty spurs at (a) Bakers Haulover, Florida,(b) Fort Pierce, Florida, (c) Siuslaw
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