Numerical models of subduction dip angle with variable viscosity

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dc.contributor.advisorDeBremaecker, Jean-Claudeen_US
dc.contributor.committeeMemberLallemant, Hans G. Avéen_US
dc.contributor.committeeMemberClark, Howard C.en_US
dc.creatorWong, Peter Kinen_US
dc.date.accessioned2018-12-18T21:15:11Zen_US
dc.date.available2018-12-18T21:15:11Zen_US
dc.date.issued1981en_US
dc.description.abstractMany models have been used to examine subduction dip angle but none of which is both, dynamic and time dependent. Numerical models are developed to follow the thermal evolution of the subduction zone. The energy equation includes advection, the adiabatic gradient, viscous dissipation, radiogenic sources and variable diffusivity. The pressure is eliminated by combining the two momentum equations into a fourth, order stream-function equation. Both the energy and stream-function equations are solved numerically on a special non-uniform offset grid using the Altemating-Directon Implicit method. In a convection cell with Herring-Nabarro viscosity, circulation will be restricted to the left side of the cell while the descending limh is on the right. Altering the aspect ratio by changing the depth, has a much more pronounced effect on the total circulation and velocities than by changing the width. A convection cell will reorganize its circulation pattern to achieve steady-state when a highly viscous block, is "inserted” into the cell to disrupt normal circulation. Finally, the convective pattern in a system in which the boundary conditions are perpetually changing is determined by both its present boundary conditions and also by those preceding it by several millions of years.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent62 ppen_US
dc.identifier.callnoThesis Geol. 1981 Wongen_US
dc.identifier.citationWong, Peter Kin. "Numerical models of subduction dip angle with variable viscosity." (1981) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103906">https://hdl.handle.net/1911/103906</a>.en_US
dc.identifier.digitalRICE1532en_US
dc.identifier.urihttps://hdl.handle.net/1911/103906en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleNumerical models of subduction dip angle with variable viscosityen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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