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- W2186950892 abstract "The shear stress exerted at the bed and walls of granular flows is an important quantity for modeling and predicting runout, bulking up, channel erosion, and entrainment. Although there are some measure- ments of boundary shear stress for granular flows in the field and laboratory, we lack systematic measure- ment of shear stress for a range of flow properties such as particle size, particle shape, and fluid content, es- pecially with natural sediment or for long durations where the flow may evolve. We used two vertically rotating drums to study the boundary shear stress of granular flows, a smaller drum that was 56 cm diameter and 15 cm wide, and a larger drum that was 4 m diameter and 80 cm wide. The materials we used in- cluded combinations of different sized glass marbles, sand, gravel, fine sediment, and water. We compared two ways of estimating the boundary shear stress us- ing the force balance of the particle flow in the drum. We varied particle size, particle shape, and fluid con- tent. Larger and more angular particles increased the total boundary shear stress, as did a decrease in fluid content. This study illustrates some of the mechanisms and particle dynamics that control the boundary shear stress in natural geological flows, which has implica - tions for debris flow modeling and hazard mitigation." @default.
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- W2186950892 date "2011-01-01" @default.
- W2186950892 modified "2023-09-27" @default.
- W2186950892 title "BOUNDARY SHEAR STRESS OF GRANULAR FLOWS" @default.
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