commit c0c8ccc75dc0529e5d27c5670c010d3204578646
parent b370569635c2df69eb4bf0ab253efd8ff9e09f85
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Thu, 21 Nov 2019 11:57:39 +0100
Elaborate on driving mode and glacier settings
Diffstat:
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/continuum-granular-manuscript1.tex b/continuum-granular-manuscript1.tex
@@ -290,6 +290,13 @@ In rate-\emph{limited} experiments, the iterative procedure is only performed fo
\subsection{Simulation setup}
Parameter values and their references are listed in Table~\ref{tab:params}.
For the first experiment with variable water pressure, we apply a water-pressure forcing amplitude of 50 kPa that modulates effective stress at the top around 100 kPa (Fig.~\ref{fig:stick_slip}).
+Deformation of subglacial beds is
+
+Many simulations are performed under both stress- and rate-controlled shear, which both idealize the driving glacier physics.
+Real glacier settings likely fall somewhere in between, depending on how important basal friction is to the overall stress balance.
+Stress-controlled conditions approximate a setting where ice flow directly responds to changes in subglacial strain rates.
+Whillans Ice Plain, West Antarctica is an example of this setting, where a low surface slope and low driving stress results in stick-slip movement \citep[e.g.][]{Bindschadler2003}.
+A rate-controlled setup is the opposite end member, where changes in bed friction do not influence ice flow velocity.
\begin{figure*}[htbp]
\begin{center}
@@ -310,8 +317,7 @@ For the first experiment with variable water pressure, we apply a water-pressure
{\scriptsize
\begin{tabular}{llllllll}
\toprule
- Parameter oo2ae
- Symbol & Units & DEM particles & Caesar Till & Storglaci\"aren & Two Rivers & WIS \\
+ Parameter & Symbol & Units & DEM particles & Caesar Till & Storglaci\"aren & Two Rivers & WIS \\
\midrule
Friction coefficient & $\mu_\text{s}$ & -- & $0.404_\text{a}$ & $0.532_\text{}$ & $0.494_\text{b}$ & $0.321_\text{b}$ & 0.443$_\text{c}$ \\
Cohesion & $C$ & kPa & $0_\text{a}$ & $-6.5_\text{}$ & $5.0_\text{b}$ & $14_\text{b}$ & 3.0$_\text{c}$ \\
