Onset of sediment motion
The onset of sediment transport is fundamental to sediment transport predictions, river restoration design, and channel evolution calculations. However, large uncertainties remain in predicting the flows that cause the initial movement of sediment. To better understand and predict sediment motion, we are using a combination of laboratory experiments, field measurements, mechanistic theory development, and Discrete Element Method modeling. Some topics we are investigating include:
the role of turbulence in sediment movement
the temporal variations in the onset of motion that are driven by sediment supply and flow histories
granular mechanics
estimating critical shear stresses from simple bed photos or point clouds (https://github.com/eyager/ProPlus)