Figure S2: Examples of the mapping of tributary channel deposit cross sections. The first 3 images are of the same area through time. For each image the channel deposit is mapped to the edge of the visible sediment at regular intervals, shown in blue. The final image shows a subsection of a catchment with the mapped cross sections in different colours. The cross section from 2011 is mapped in blue, 2011 in yellow and 2018 in red. Due to rectification errors within Google Earth the cross sections are not in the exact same position, however care was taken to ensure repeat surveys were taken as close as possible.