Low-frequency acoustic classification of methane hydrates

dc.contributor.advisorWilson, Preston S.en
dc.contributor.committeeMemberHamilton, Mark F.en
dc.contributor.committeeMemberCoffin, Richard B.en
dc.creatorGreene, Chad Allenen
dc.date.accessioned2011-02-16T19:35:42Zen
dc.date.available2011-02-16T19:35:42Zen
dc.date.available2011-02-16T19:35:55Zen
dc.date.issued2010-12en
dc.date.submittedDecember 2010en
dc.date.updated2011-02-16T19:35:55Zen
dc.descriptiontexten
dc.description.abstractMethane hydrates are naturally-occurring ice-like substances found in permafrost and in ocean sediments along continental shelves. These compounds are often the source of cold seeps—plumes which vent methane into aquatic environments, and may subsequently release the potent greenhouse gas into the atmosphere. Methane hydrates and methane gas seeps are of particular interest both for their potential as an energy source and for their possible contribution to climate change. In an effort to improve location of hydrates through the use of seismic surveys and echo-sounding technology, this work aims to describe the low-frequency (10 Hz to 10 kHz) acoustic behavior of methane gas bubbles and methane hydrates in water under simulated ocean-floor conditions of low temperatures and high pressures. Products of the experiments and analysis presented in this thesis include (a) passive acoustic techniques for measurement of gas flux from underwater seeps, (b) a modified form of Wood's model of low-frequency sound propagation through a bubbly liquid containing real gas, and (c) low-frequency measurements of bulk moduli and dissociation pressures of four natural samples of methane hydrates. Experimental procedures and results are presented, along with analytical and numerical models which support the findings.en
dc.description.departmentMechanical Engineeringen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2010-12-2632en
dc.language.isoengen
dc.subjectMethane hydratesen
dc.subjectAcousticsen
dc.subjectBubbly liquidsen
dc.subjectGas bubblesen
dc.subjectPassive acousticsen
dc.subjectUnderwater gasen
dc.titleLow-frequency acoustic classification of methane hydratesen
dc.type.genrethesisen
thesis.degree.departmentMechanical Engineeringen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorUniversity of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Science in Engineeringen

Access full-text files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
GREENE-THESIS.pdf
Size:
3.05 MB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.12 KB
Format:
Plain Text
Description: