| Popis: |
Heavily sediment-laden flows have been described and classified as hyperconcentrated sediment flows, including mud floods, mudflows, and debris flows. The authors prescribe definitions based on governing physical processes and limited concentrations of cohesive material. Viscous mudflows contain large concentrations of fine cohesive material. Rocky debris flows contain large concentrations of clastic material. Rheological analyses should recognize four types of shear stresses: 1) yield stress; 2) viscous stress; 3) turbulent stress; and 4) dispersive stress. These shear stresses combine into a quadratic rheological model. Dimensionless parameters from the ratio of shear stress terms identify the predominant physical process. |
