(a) Schematic of flume setup showing primary instrument locations (see Table 1). The yellow shaded area represents the sand volume and the dark grey shaded area is the permanent 1:6 impermeable slope. The black solid and dashed horizontal lines indicate the minimum (zwl = 4.5 m) and maximum (zwl = 4.9 m) water levels. (b) Close up of the dynamic cobble berm revetment geometry after construction corresponding to the grey box in (a). The minimum water level used for revetment testing (zwl = 4.6 m) is shown as a solid horizontal line and the dashed line indicates the maximum water level. The light grey region indicates the constructed dynamic revetment and the dot-dashed line shows the beach profile prior to revetment construction. (c) Photograph of the constructed dynamic revetment on the underlying sand beach. The yellow line indicates the initial line of the revetment crest.