commit 12c9c7a91748a3c0982bc02aeb096d8394dcbb2a
parent 5441c00dbbb949a104613d8c453545d37c2cba49
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Mon, 21 Oct 2019 11:01:18 +0200
Rewrite abstract
Diffstat:
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/continuum-granular-manuscript1.tex b/continuum-granular-manuscript1.tex
@@ -48,14 +48,13 @@ maxcitenames=2, backend=bibtex8]{biblatex}
\maketitle
\begin{abstract}
-The dynamic interplay between fast ice flow, meltwater drainage, and till deformation.
-
-Subglacial sediment mechanics are of primary importance to glacier and ice-sheet flow patterns at high basal water pressures.
-Till yield strength follows the non-linear Mohr–Coulomb rheology, but that does not by itself describe the spatial distribution of strain.
-Here we present a water-saturated granular continuum model that is consistent with laboratory experiments on till and follows Mohr–Coulomb behavior.
-The model is sufficiently lightweight to allow for coupled glacier-sediment-hydrology modeling.
-The strain distribution and sediment transport arises from principal sediment properties, and for the first time allows for a quantification of sediment advection during shear.
+The dynamic interplay between fast ice flow, meltwater drainage, and till deformation is crucial for understanding glacier and ice-sheet behavior.
+The till yield strength is highly dependent on water pressure, and is accuratly described by the Mohr–Coulomb rheology.
+Subglacial sediment transport constructs landforms that influence glacier stress balance and post-glaciation geomorphology.
+However, the physical transport of till during subglacial shear is not well understood, and is for that reason not included in prognostic ice-sheet models.
+Here we present a water-saturated continuum model that is consistent with Mohr–Coulomb mechanics and is suitable for coupled glacier-sediment-hydrology modeling.
We show that past pulses in water pressure can transfer shear away from the ice-bed interface and deep into the bed.
+Deep deformation is most likely in beds with high hydraulic permeability, experiencing slow and large water-pressure variations.
\end{abstract}