Physics – Geophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3621405d&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 21, CiteID L21405
Physics
Geophysics
3
Biogeosciences: Biogeophysics, Physical Properties Of Rocks: Acoustic Properties, Biogeosciences: Microbe/Mineral Interactions
Scientific paper
It is not known how biofilms affect seismic wave propagation in porous media. Such knowledge is critical for assessing the utility of seismic techniques for imaging biofilm development and their effects in field settings. Acoustic wave data were acquired over a two-dimensional region of a microbial-stimulated sand column and an unstimulated sand column. The acoustic signals from the unstimulated column were relatively uniform over the 2D scan region. The data from the microbial-stimulated column exhibited a high degree of spatial heterogeneity in the acoustic wave amplitude, with some regions exhibiting significant increases in attenuation while others exhibited decreases. Environmental scanning electron microscopy showed differences in the structure of the biofilm between regions of increased and decreased acoustic wave amplitude. We conclude from these observations that variations in microbial growth and biofilm structure cause heterogeneity in the elastic properties of porous media with implications for the validation of bioclogging models.
Atekwana Estella A.
Davis Caroline A.
Haugen Marisa E.
Pyrak-Nolte Laura J.
Werkema Dale D.
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