Quick update: we completed the 45Hz runs at high resolution, and are repeating that experiment with longer data collection reach of 9m length to explore the evolution of dune groups (clusters of higher topography/larger dunes spaced by smaller, lower topography dunes) and the stratigraphy they leave behind. Tomorrow we will also start to explore the effect of varying the hydrograph on dune preservation (following on Leary and Ganti, 2020 Geophys. Res. Letters). The data above shows one 8m long section of the 45Hz, 16cm depth experiment. Z scale in mm (uncorrected for refraction).

So far we have run 3 separate flow conditions to test instrumentation and collect preliminary repeat laser scan data for equilibrium dunes. Scans are being collected approximately 1 per minute, over a 3m reach of the flume. We are shooting for about 12-14 hours of continuous scan data per run. -35 Hz pump frequency (still need to do discharge calibrations), 13cm depth -40 Hz pump frequency, 16cm depth -45 Hz pump frequency, 16cm depth 3D laser scan topography data have been coming out amazing. Below is unprocessed (only gridded to 1mm x 1mm resolution) from the 40 Hz 16cm experiment, scans in the image are separated by 30 minutes. Color scale is in mm however is uncorrected for refraction at the water surface.