commit 01785de7c6046ebef202de071755e75b37d3a56d
parent 8d086944cd053fd51067e225c55ac920f0891a3c
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Thu, 14 Nov 2019 15:19:11 +0100
Update intro
Diffstat:
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/continuum-granular-manuscript1.tex b/continuum-granular-manuscript1.tex
@@ -76,7 +76,7 @@ In-situ field observations demonstrate that deformation of this layer can contri
\citet{Boulton1987} argued that a viscous rheological model with mild stress non-linearity appropriately describes subglacial till deformation.
A viscous rheology implies that the stress required to deform the till is strongly dependent on how fast it is deformed.
However, \citet{Kamb1991}, \citet{Iverson1998}, and \citet{Tulaczyk2000} demonstrated from laboratory shear tests that rate-independent Mohr-Coulomb plasticity, as common for sedimentary materials, is a far better rheological description for subglacial till.
-Mohr-Coulomb plastic materials have a yield strength that linearly scales with effective stress, regardless of strain rate.
+Mohr-Coulomb plastic materials have a yield strength that linearly scales with effective stress and is insensitive to strain rate.
\citet{Iverson2010} reviewed possible viscous contributions during till-water deformation, but deemed them to be of minor importance.
In spite of a limited observational basis, viscous rheologies continued to be applied as they allow for mathematical modeling of till advection.
Tills with viscous rheology were used to explain coupled ice-bed processes including subglacial sediment transport \citep[e.g.,][]{Jenson1995}, landform formation \citep[e.g.,][]{Hindmarsh1999, Fowler2000}, localization of water drainage \citep[e.g.,][]{Walder1994, Ng2000b}, and ice-sheet behavior in a changing climate \citep[e.g.,][]{Pollard2009}.
