Supplementary material to "Channel Dynamics in an Experimental Alluvial Fan Under Constant Boundary Conditions: A Classification of Avulsion and Lateral Migration Events"

Here we provide additional details about the equipment, data sources, and preprocessing steps used in the experiment.Specifically, we describe the camera setup, the two datasets collected (3D photogrammetry images and high-frequency RGB images), and the methods applied to prepare these datasets for analysis. S1.1 Equipment 5A total of seven Canon EOS Rebel T6i DSLRs were used in the experiment.One camera was mounted directly overhead, 1.5 m above the center of the fan surface, oriented vertically downward, and captured RGB images at 3-second intervals to document surface flow patterns at high spatial and temporal resolution.The remaining six cameras were dedicated to Structure-from-Motion (SfM) photogrammetry for generating digital elevation models (DEMs).These cameras were mounted side-by-side on a rigid rail system positioned 1.0 m above the fan table.The rail was moved in 10 cm increments along the 2.5 m table length, 10