Microbial influence on erosion, grain transport and bedform genesis in sandy substrates under unidirectional flow
Article first published online: 8 AUG 2011
© 2011 The Authors. Journal compilation © 2011 International Association of Sedimentologists
Volume 59, Issue 3, pages 795–808, April 2012
How to Cite
HAGADORN, J. W. and MCDOWELL, C. (2012), Microbial influence on erosion, grain transport and bedform genesis in sandy substrates under unidirectional flow. Sedimentology, 59: 795–808. doi: 10.1111/j.1365-3091.2011.01278.x
- Issue published online: 20 MAR 2012
- Article first published online: 8 AUG 2011
- Manuscript received 20 June 2010; revision accepted 15 June 2011
Movie S1. Montage illustrating flow velocities in which grain rolling, grain saltation and ripple formation occurs in unbound sand. Plan view image sequence at left; oblique cross-sectional view at right.
Movie S2. Montage providing end-member examples of the ranges of sizes and shapes of rip-ups that form. The first animation sequence is of small rip-ups forming from a thin microbial film, and the second animation sequence is of a large rip-up forming in a more mature, thicker mat – note the kite-like uplift of the rip-up and dragging that occurs in the second image sequence. Plan view image sequence at left; oblique cross-sectional view at right.
Movie S3. Montage providing representative examples of flow velocities under which different microbial bedforms are produced. The hypothesized microbial bedform progression includes: no grain movement, flip-overs, roll-ups and rip-ups. Plan view image sequence at left; oblique cross-sectional view at right.
Movie S4. Montage illustrating: (i) how multi-grain sand aggregates form, these aggregates come from below the surface of a mat that has already been partially eroded; and (ii) erosional edges that form upcurrent and adjacent to erosional remnants of well-developed microbial films and mats. Plan view image sequence at left; oblique cross-sectional view at right.
Movie S5. Animation illustrating the terraced erosion that occurs at the upstream side of immature or thin microbial films. This erosion, visible at the top of the image sequence, proceeds like open-pit mining, where laminations are sequentially eroded from below the former surface of the microbial film.
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