Koehler, Stephan A
We studied the topography of a granular bed after dragging intruders, such as vertical posts, through an initially leveled surface using a stereographic camera. We studied the parameters R, the intruder radius, and Z, the immersion depth, in relation to surface displacements for slow moving intruders which were much larger than the particle size. The inclination angles of surfaces exceeded theta=35° in the trough behind the post, and were significantly greater than the angle of repose theta=24° of free standing piles. The mounds and their profiles were roughly geometrically similar, and increased in size with intruder radius R and immersion depth Z. The ratio of the mound volumes to immersed intruder volumes exhibited a roughly linear increase with the ratio Z/R.
Worcester Polytechnic Institute
Major Qualifying Project
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