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Stability and Uncertainty of Ice-She...

Hay, Michael John.

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Stability and Uncertainty of Ice-Sheet Crystal Fabrics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Stability and Uncertainty of Ice-Sheet Crystal Fabrics./
Author:	Hay, Michael John.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	120 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
Contained By:	Dissertation Abstracts International79-01B(E).
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10289772
ISBN:	9780355123609

Stability and Uncertainty of Ice-Sheet Crystal Fabrics.
Hay, Michael John.

Stability and Uncertainty of Ice-Sheet Crystal Fabrics. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 120 p.

Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.

Thesis (Ph.D.)--University of Washington, 2017.

Ice crystal orientation fabric has a large effect on polycrystalline ice flow. In this thesis, I explore uncertainty of ice fabric measurements, and the related question of stability of ice crystal fabrics and anisotropic ice flow in ice sheets. I develop new estimates of uncertainty of fabric parameter estimates from thin-section data, and connect this to uncertainty in ice flow characteristics. To reduce this sampling error, I develop a new inverse method to infer fabric parameters from sonic velocity measurements and thin-section samples. I show a number of results concerning the stability of ice crystal fabrics in ice sheets. First, I show that small velocity gradient perturbations can induce large changes in ice fabric, which in turn affects anisotropic ice viscosity significantly. Next, I analyze the development of incipient fabric perturbations in coupled flow. I develop an analytical coupled model of anisotropic ice flow and fabric evolution, and show that the coupled system is unstable in many circumstances under ice-sheet flank flow and divide flow.

ISBN: 9780355123609Subjects--Topical Terms:

535228
Geophysics.

Stability and Uncertainty of Ice-Sheet Crystal Fabrics.
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100 1 $a Hay, Michael John. $3 3347291
245 1 0 $a Stability and Uncertainty of Ice-Sheet Crystal Fabrics.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 120 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
500 $a Adviser: Edwin D. Waddington.
502 $a Thesis (Ph.D.)--University of Washington, 2017.
520 $a Ice crystal orientation fabric has a large effect on polycrystalline ice flow. In this thesis, I explore uncertainty of ice fabric measurements, and the related question of stability of ice crystal fabrics and anisotropic ice flow in ice sheets. I develop new estimates of uncertainty of fabric parameter estimates from thin-section data, and connect this to uncertainty in ice flow characteristics. To reduce this sampling error, I develop a new inverse method to infer fabric parameters from sonic velocity measurements and thin-section samples. I show a number of results concerning the stability of ice crystal fabrics in ice sheets. First, I show that small velocity gradient perturbations can induce large changes in ice fabric, which in turn affects anisotropic ice viscosity significantly. Next, I analyze the development of incipient fabric perturbations in coupled flow. I develop an analytical coupled model of anisotropic ice flow and fabric evolution, and show that the coupled system is unstable in many circumstances under ice-sheet flank flow and divide flow.
590 $a School code: 0250.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 $a University of Washington. $b Earth and Space Sciences. $3 2097740
773 0 $t Dissertation Abstracts International $g 79-01B(E).
790 $a 0250
791 $a Ph.D.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10289772