Document Detail


Measuring grain roughness for the purpose of high-frequency acoustic modeling.
MedLine Citation:
PMID:  19063047     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Grain roughness and packing are important sediment properties for newer acoustic models. We present the scanning electron stereomicroscopic imagery of natural sand grains of varying shape and roughness for evaluation of potential grain interactions of individual grains. The grain shape and the presence of microasperities will determine the probability of the contact with surrounding grains being a point or a larger area. Moreover, the use of a micro-roughness power spectrum in characterizing the sand grain roughness may be appropriate. Grain contact information is an essential starting point for developing and evaluating acoustic models that address acoustic losses at high frequencies. This information provides the basis to understand contact mechanics, such as grain slip and frame dilation, during insonification. Because media frame stiffness depends, at the grain scale, on the number and type of grain-to-grain contacts, we characterize sand sediments with imagery identifying such grain contact information. The natural shapes of grains, their variations, and their packing density present a broad distribution of grain contact types and areas. X-ray microfocus computed tomography captures volumetric images of grain interactions, which enable the grain contacts to be classified and quantified. The method and results of this evaluation with computed tomography will be also presented.
Authors:
Kevin Briggs; Allen Reed; Richard Ray; Michael Richardson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  124     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-12-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2469     Citation Subset:  IM    
Affiliation:
Seafloor Sci. Branch, Naval Res. Lab., Stennis Space Ctr., MS 39529, kbriggs@nrlssc.navy.milNaval Res. Lab., Stennis Space Ctr., MS 39529.
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