Extended Data Fig. 8: Measurement of the angle of repose of experimental materials. | Nature

Extended Data Fig. 8: Measurement of the angle of repose of experimental materials.

From: Grain shape effects in bed load sediment transport

Extended Data Fig. 8

a, Spheres. b, Faceted ellipsoids. c, Rounded chips. d, Painted natural gravel. Painted gravel was used in the experiments to aid automated grain identification. e, Rectangular prisms. Blue and red lines are the right and left edges of the pile silhouette extracted with image analysis. Yellow lines are least-squares fits to these edges used to estimate the angle of repose. Vertical red line at the centre of each image is a plumb line used to determine the direction of gravity.

Back to article page