Small-scale fluctuations in acoustic and physical properties in surficial carbonate sediments and their relationship to bioturbation |
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Authors: | K B Briggs M D Richardson |
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Institution: | (1) Marine Geosciences Division, Naval Research Laboratory, Stennis Space Center, MS 39529-5004, USA, US |
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Abstract: | Measurements of physical and acoustic properties within the top 40 cm of sediment indicate that there are three classes of
parameter variability relevant to acoustic bottom scattering at the Marquesas Keys and Dry Tortugas sites. The three classes
of variability, spatially and temporally different in terms of scale, are generated by biological and physical processes acting
on sediments. Interplay of bioturbation, trawling and storm events create fine laminations of sand–silt–clay and high gravel-size
mollusk shell content at the Marquesas Keys site; the predominance of biological processes creates strong surficial gradients
and lateral variability in sediment properties at the Dry Tortugas site. |
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