Analysis of Atlantic cliff vulnerability to coastal erosion in the province of Cadiz

Abstract

This work presents an analysis of the vulnerability of Atlantic cliffs in the province of Cadiz (SW Spain) to coastal erosion. For this purpose a semi-quantitative approach has been taken by developing and applying a Relative Vulnerability Index that includes the most important factors affecting cliff stability in the area, such as lithology, internal structure, presence/absence of a beach or rocky shore platform, human activities in the area, etc. The index also includes quantitative cliff retreat data derived from the application of photogrammetric techniques to aerial photographs from different dates. Results allow to classify Cadiz cliffs according to their vulnerability to erosion, and provide insight into the main factors and processes involved in cliff recession in this area. This kind of information is essential in order to develop proper land use planning strategies in the Protection Easement Zone of the Coastal Public Property in cliffed areas.