Fig. 1

Examples of systems with a loss of confinement. a Sketch of a channel-lobe transition zone based on bathymetrical surveys. Modified from ref. ¹³. b The Squamish Delta. In the upper bathymetry map, the channel termination is marked by a rapid loss of confinement⁴³. The lower bathymetry map was obtained 5 years later and shows how erosion has led the propagation of the channel by ~400 m⁴¹