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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.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Stability and Uncertainty of Ice-Sheet Crystal Fabrics./
作者:	Hay, Michael John.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	120 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
Contained By:	Dissertation Abstracts International79-01B(E).
標題:	Geophysics. -
電子資源:	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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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.
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