Bedload Transport: Sand Sheet Migration
Scenes from 'Bedload Transport of Binary Mixtures of Coarse Sand and Fine Gravel' (Ronald L. Shreve and Thomas G. Drake; produced with support from the Donors of the Petroleum Research Fund).
1st part shows bedload sheet migration in water flow for a 100% sand bed. Low amplitude patches of material move down flow without an avalanche face (i.e. sheet face is less than angle of repose), over time they steepen to a true avalanche foreset.
2nd down flow migration of sandy avalanche foresets. The topography of the starting bed is shown with a yellow line and provides a useful measure to see aggradation/progradation rate. Sand is transported along, or slightly above, the bed. Beyond the brink point, grains settle onto the foreset. After building up a bit some avalanche down slope.
File 31378 is a 9.1MB Quicktime MP4 Video
Uploaded: Jan20 12
Last Modified: 2012-01-20 11:53:02