Bubble growth and rise in soft sediments

B.P. Boudreau, C. Algar, B.D. Johnson, I. Croudace, A. Reed, Y. Furukawa, K.M. Dorgan, P.A. Jumars, A.S. Grader, Bruce Gardiner

    Research output: Contribution to journalArticle

    171 Citations (Scopus)

    Abstract

    The mechanics of uncemented soft sediments during bubble growth are not widely understood and no rheological model has found wide acceptance. We offer definitive evidence on the mode of bubble formation in the form of X-ray computed tomographic images and comparison with theory. Natural and injected bubbles in muddy cohesive sediments are shown to be highly eccentric oblate spheroids (disks) that grow either by fracturing the sediment or by reopening preexisting fractures. In contrast, bubbles in soft sandy sediment tend to be spherical, suggesting that sand acts fluidly or plastically in response to growth stresses. We also present bubble-rise results from gelatin, a mechanically similar but transparent medium, that suggest that initial rise is also accomplished by fracture. Given that muddy sediments are elastic and yield by fracture, it becomes much easier to explain physically related phenomena such as seafloor pockmark formation, animal burrowing, and gas buildup during methane hydrate melting.
    Original languageEnglish
    Pages (from-to)517-520
    JournalGeology
    Volume33
    Issue number6
    DOIs
    Publication statusPublished - 2005

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