The scientific problem and goal of our project is the fact that systematical quantitative measurements of erosion and morphological changes of the cliff have not yet been performed. To understand the processes of cliff changes, all influencing factors should be quantified. With modern methods of geological mapping and geodetic methods (photogrammetric ranging, terrestrial laser scanning and satellite PSInSAR methods), we are able to determine the temporal and spatial changes of unstable regions very precisely.
A special challenge will be the quantification of risk assessment, which will be one of our main research topics and novelties. We would like to upgrade the methodology of risk assessment, presented by Rio & Gracia (2009) for the coastal cliffs. They have defined two factors; the Hazard Index and Impact Index, which combine into the Risk Index. We chose this approach as all influencing factors are quantified, and we will improve their methodology by using additional parameters, such as fracture orientation and spacing, plus the physically measured erosion rates.
Another contribution will be also the study of sapping effects, as softer marlstone layers are eroded more quickly than harder sandstone beds, resulting in sapping (undermining) the more resistant layers above, leading to dangerous rockfalls. Relationships between the fracture spacing and bed thickness have been investigated, however sapping remains underinvestigated. Final novelty will be the integration of all methods, with also the practical aim of testing their applicability.
Described processes have also a socio-economic impact. Very problematic is a large number of visitors all year-round and numerous bathers during the summer, which walk and lie directly at the base of cliffs. Another problem pose the residential buildings, built very close to the cliff edge, and some terraces have already been undermined.