manus_continuum_granular1

manuscript files for first continuum-till paper
git clone git://src.adamsgaard.dk/manus_continuum_granular1
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commit 12c9c7a91748a3c0982bc02aeb096d8394dcbb2a
parent 5441c00dbbb949a104613d8c453545d37c2cba49
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Mon, 21 Oct 2019 11:01:18 +0200

Rewrite abstract

Diffstat:
Mcontinuum-granular-manuscript1.tex | 13++++++-------
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}