4. Coastal Erosion and Protection Measures Including Case Studies
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Back-shore
Nourishment
Shore-face
Nourishment
Fig. 4.12 Principles of beach nourishment.
(a) Backshore
Backshore nourishment usually feeds sediments/sands into the uppermost
région of the profile i.e. on the foot of dunes or backshores. This aims to
mitigate the erosion/breaching of dunes against extreme events, and ends
up sacrificing huge quantifies restored sédiments in the front face during
the same. This method can be viewed as an emergency measure to prevent
dune setback during storms.
(b) Beach
The supply of sand to the région of eroded beach intended to increase beach
width and thereby its recreational value is known as beach nourishment.
This is not a direct Coastal protection measure, although a wider beach acts
as a buffer to withstand any possible extreme event or even disaster. It is to
be noted that the borrowed material used for replenishment must be analogous with the serving/parent sédiment, such as to adjust to the existing
profile. Use of slightly coarser sédiment than the serving/parent sédiment
is favourable, as it improves the stability by resulting in the formation