Erosion and phase-separation - coupled and dominant processes in geophysical mass flows.

Potsdam

2017

2 S.

Monographie

In: Jahrestagung der Deutschen Geophysikalischen Gesellschaft e.V., Potsdam, (77)

12235S

202758

Landslides and debris flows are gravity driven mixture flows of soil, sand, rock and water. Solid particles and viscous fluid governs the rheological properties, and their coupling significantly influences the dynamics. Landslides can dramatically increase their volume, become exceptionally mobile and highly destructive by entraining bed sediment and fluid. The mixture composition can evolve and strikingly change the spatial distribution of particles and fluid. This results in local changes of frictional and viscous resistance. As erosion-deposition and phaseseparation between solid and fluid strongly depend on material composition these natural phenomena play critical role in flow and deposition dynamics. Proper understanding of these complex physical processes is very important for an accurate description of impact forces, inundation areas, landscape evolution and reliable mitigation plans. Quantifying the underlying processes of erosion, phase-separation and deposition are among the long-standing challenges in mass flow simulation.