Bed level evolution of the point-elevation measurements. (a, b) Location of the sampling points Z1–Z3 on the Zuidgors intertidal flat (Western Scheldt) and G1–G4 on the Galgeplaat intertidal flat (Eastern Scheldt). See Fig. 1 for the position of these transects. The elevation maps, measured halfway the period of the time series, are shown as a reference. (c, d) Time series of the bed level evolution at Zuidgors and Galgeplaat, respectively. The black rectangular and circular annotations indicate examples of sudden changes in evolution. (e) The time series at Galgeplaat location G1 is repeated. Here, also a linear fit based on the data between 1988 and 1990 and a linear fit based on the data after February 1990 are shown (before and after the 1990 storm). All data is shown versus a fixed reference frame (the 2014 mean sea level; MSL).