Global warming, melting polar caps, rising sea levels and intensifying
wave-current action, factors responsible for the alarming phenomena of
coastal erosion on the one hand and adverse environmental impacts and
the high cost of 'hard' protection schemes, on the other, have created
interest in the detailed examination of the potential and range of
applicability of the emerging and promising category of 'soft' shore
protection methods. 'Soft' methods such as beach nourishment, submerged
breakwaters, artificial reefs, gravity drain systems, floating
breakwaters, plantations of hydrophylous shrubs or even dry branches,
applied mostly during the past 20 years, are recognised as possessing
technical, environmental and financial advantageous properties deserving
more attention and further developmental experimentation than has
occured hitherto. On the other hand, 'hard' shore protection methods
such as seawalls, groins and detached breakwaters, artefacts borrowed
from port design and construction technology, no matter how well
designed and well implemented they may be, can hardly avoid
intensification of the consequential erosive, often devastating, effects
on the down-drift shores. Moreover, they often do not constitute
environmentally and financially attractive solutions for long stretches
of eroding shoreline. Engineers and scientists practising design and
implementation of shore defence schemes have been aware for many years
of the public demand for improved shore protection technologies. They
are encouraging efforts that promise enrichment of those environmentally
sound and financially attractive methods that can be safely applied.