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dc.rights.licenseCC BY-NC-ND. Users may download and share copies with attribution in accordance with a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License. No commercial use or derivatives are permitted without the explicit approval of the author.
dc.contributorSiegmann, W. L.
dc.contributorPierce, Allan D.
dc.contributorHerron, Isom H., 1946-
dc.contributorKapila, Ashwani K.
dc.contributor.authorFayton, Joseph O.
dc.date.accessioned2021-11-03T08:07:46Z
dc.date.available2021-11-03T08:07:46Z
dc.date.created2014-04-14T11:26:59Z
dc.date.issued2013-12
dc.identifier.urihttps://hdl.handle.net/20.500.13015/1054
dc.descriptionDecember 2013
dc.descriptionSchool of Science
dc.description.abstractCurrent geoacoustic models fail to estimate accurately the shear speed and attenuation of high-porosity marine mud, because they do not account for the physics of its colloidal and aggregation properties. Marine mud is comprised of seawater and thin clay mineral platelets that possess a net negative charge. Positive ions in the seawater congregate near the platelet surface, suggesting an electrical model of a platelet as a sheet of uniformly distributed longitudinal quadrupoles aligned perpendicular to the surface. This electrical structure causes interactions that lead platelets to aggregate into card-house structures wherein platelets have nearly perpendicular contact. The shear speed of the card-house is calculated from an effective shear modulus using electric and elastic forces between platelets when the card-house is perturbed. Several platelet interaction models are considered, and one with rigid rotation (neglecting elasticity) of platelets separated by a small channel produces shear speed estimates consistent with experimental observations. Estimates of card-house porosity are calculated from two-dimensional idealized computational models based on two different aggregation processes. Particle-cluster and cluster-cluster models lead to porosities consistent with observations. Additionally, for the cluster-cluster model, solid content is dependent on the aggregate length scale in a fractal manner. Bubbles in mud are observed to have thin shapes, which may arise from the electrical properties of the platelets. Electrostatic effects on bubbles are investigated by considering the experimental observation of decreased coalescence of bubbles in salt water.
dc.language.isoENG
dc.publisherRensselaer Polytechnic Institute, Troy, NY
dc.relation.ispartofRensselaer Theses and Dissertations Online Collection
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subjectMathematics
dc.titleEstimation of geoacoustic parameters of ocean mud
dc.typeElectronic thesis
dc.typeThesis
dc.digitool.pid170917
dc.digitool.pid170918
dc.digitool.pid170919
dc.digitool.pid174289
dc.rights.holderThis electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
dc.description.degreePhD
dc.relation.departmentDept. of Mathematical Sciences


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CC BY-NC-ND. Users may download and share copies with attribution in accordance with a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License. No commercial use or derivatives are permitted without the explicit approval of the author.
Except where otherwise noted, this item's license is described as CC BY-NC-ND. Users may download and share copies with attribution in accordance with a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License. No commercial use or derivatives are permitted without the explicit approval of the author.