Definition Cartoon of Beach and Dune Environment with Variables

(a) Definition sketch of the beach and dune environment. Dashed line shows the post-event beach and dune surface, with elevations referenced to the still water level (s_wl). Dune and beach variables include dune crest elevation (z_c) and cross-shore position (x_c), dune base elevation (z_b) and cross-shore position (x_b), shoreline position (x_sl), beach width (W_beach) and dune width (W_dune). Hydrodynamic variables include mean (η₅₀), and extreme (η₉₈) water levels, (b) Schematic diagram of the Bayes network representing a conceptual model of this system and its evolution. Variables in boxes with bold outline represent the original model and the non-bold outline boxes are variables that extend this model.