Based on our topographically corrected DGPS measurements the lake floor in the immediate vicinity of the shoreline and at the spit is ~1.2 m AHD (Fig. 3), and the geomorphology on both sides of the shoreline shows considerable variability. Most of the northern and northwestern portions of the study area resemble relatively flat, but gently dipping surfaces. Four surfaces (“alluvial”; A0eA3) were distinguished based on differences in elevation (Fig. 3) and surface expression, e.g. small-scale topography, patchiness and variability of surface material and vegetation (Suppl. Fig. 1).