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    Visco-plastic models of isothermal lava domes

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    Balmforth Visco plastic.pdf (1.051Mb)
    Date
    2000-09-08
    Author
    Balmforth, Neil J.  Concept link
    Burbidge, A. S.  Concept link
    Craster, R. V.  Concept link
    Salzig, J.  Concept link
    Shen, A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/155
    As published
    https://doi.org/10.1017/S0022112099006916
    DOI
    10.1017/S0022112099006916
    Keyword
    Isothermal lava domes
    Abstract
    The dynamics of expanding domes of isothermal lava are studied by treating the lava as a viscoplastic material with the Herschel–Bulkley constitutive law. Thin-layer theory is developed for radially symmetric extrusions onto horizontal plates. This provides an evolution equation for the thickness of the fluid that can be used to model expanding isothermal lava domes. Numerical and analytical solutions are derived that explore the effects of yield stress, shear thinning and basal sliding on the dome evolution. The results are briefly compared with an experimental study. It is found that it is difficult to unravel the combined effects of shear thinning and yield stress; this may prove important to studies that attempt to infer yield stress from morphology of flowing lava.
    Description
    Author Posting. © Cambridge University Press, 2000. This article is posted here by permission of Cambridge University Press for personal use, not for redistribution. The definitive version was published in Journal of Fluid Mechanics 403 (2000): 37-65, doi:10.1017/S0022112099006916.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Fluid Mechanics 403 (2000): 37-65
     
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