Coastal erosion and control

Coastal erosion is a problem at many coastal sites caused by natural effects as well as human activities. This paper explores the coastal cell concept to deal with coastal erosion by identifying and analysingthe sediment volumes accumulated in large-scale and small-scale coastal cells at various sites. Mechanisms causing chronic erosion and episodic erosion related to coastal variability are identified and discussed. The effectiveness of soft and hard remedial measures for sandy beaches are assessed based on laboratory, field and modelling experiences.

► Coastal erosion has always existed, but it is now largely intensified by human activities.
► Massive sand nourishment is an attractive solution of coastal erosion in terms of coastal safety and natural values, but it may not be the most economic solution.
► Hard structures such as groynes and breakwaters are no remedy for dune erosion during storm conditions with high surge levels.
► Hard structures may lead to an increase of coastal variability with maximum recession rates much larger than the initial shoreline recession.
► Detailed mathematical models are now available to determine with sufficient accuracy the morphological impact of various hard structures.