commit 74c363cc6a9ce131e137a595138379090a66bc78
parent d3524ed214e5dd9c254e375c738c7413e1d37f74
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Mon, 7 Oct 2019 16:42:56 +0200
Update intro
Diffstat:
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/continuum-granular-manuscript1.tex b/continuum-granular-manuscript1.tex
@@ -86,12 +86,8 @@ A common implementation is a regularized form where shear stress vanishes when s
In these forms the shear stress is still limited to the Mohr-Coulomb value at higher rates \citep{Schoof2006, Bueler2009, Schoof2010}.
However, the Coulomb-frictional parameterizations do not describe the actual sediment deformation, but describe the basal friction felt by the flowing ice.
Shear deformation is known to deepen under increasing effective normal stress \citep{Fischer1997, Iverson1999, Boulton2001, Damsgaard2013}, and this may be a primary ingredient for growth of subglacial topography \citep[e.g.][]{Schoof2007}.
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-%\citet{Iverson2001} demonstrated that perturbations in effective stress at depth can distribute deformation away from the ice-bed interface.
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+In order to model soft-bed sliding and till continuity, a model is necessary that accurately describes subglacial shear strain while being in accordance to Mohr-Coulomb friction and sediment near-plastcitiy.
+The discrete element model for sediment deformation by \citet{Damsgaard2013} includes Coulomb-frictional physics and sediment strain distribution, but is far too costly for coupled ice-till computations.
@@ -423,6 +419,10 @@ The stick-slip experiments (Fig.~\ref{fig:stick_slip} to~\ref{fig:stick_slip_dep
Practically all of the shear strain through a perturbation cycle occurs above the skin depth (magenta line in Fig.~\ref{fig:stick_slip_depth}).
+\section{Discussion}%
+\label{sec:discussion}
+\citet{Iverson2001} demonstrated that random perturbations in effective stress at depth can distribute deformation away from the ice-bed interface.
+
\section{Conclusion}%
\label{sec:conclusion}
