CONTRASTING SHORELINE DYNAMICS IN GEOLOGICALLY CONTROLLED BARRIERS

Quantifying and understanding coastal geomorphological change are of paramount importance for coastal management and policy making (Boak and Turner, 2005). For wave-dominated coastal barriers, contemporary morphological change is mainly determined by hydrodynamic forcing conditions and antecedent beach morphology (e.g., Burvingt and Castelle, 2023). However, in geologically controlled barriers, beach morphodynamic processes and responses are additionally influenced by the pre-existing geological framework (Robinet et al., 2020). These geological controls are rarely considered in shoreline change assessments, despite being essential for predicting future coastal change at the management scales (Cooper et al., 2018). This work examines the influence of foreshore configuration with varying degrees of geological control on shoreline evolution using seven years of satellite derived shoreline data from three beaches in the Outer Hebrides barriers (NW Scotland).