Mapping and characterisation of sinkholes in the Mendip Hills using semi-automated delineation

Abstract

This dissertation investigates the distribution and characteristics of sinkholes in the Mendip Hills, Somerset, England using a semi-automated delineation method with LiDAR Digital Elevation Models (DEMs). As the first application of this method in the UK, the study aimed to provide a more accurate and detailed understanding of sinkhole formation processes in this region. Through the analysis, over 5,500 sinkholes were identified, significantly surpassing previous records and offering new insights into their spatial distribution, size, shape, and depth.

The effectiveness of the semi-automated method in overcoming the limitations of previous manual approaches, particularly in identifying smaller and shallower sinkholes has been demonstrated. The findings suggest that karst processes in the Mendip Hills remain active, with the increased detection attributed to both ongoing natural formation and the advanced capabilities of LiDAR technology.

This detailed sinkhole database facilitates more reliable comparative analyses across different karst regions, enhancing our understanding of karstification processes and contributing to safer land use planning and management in sinkhole susceptible areas.