commit 57abb7ecb1fa49d922cad3dd5122bfa87c9f0079
parent d257f8f2e3eed89bfaecc6909c88247e2280a352
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date: Tue, 29 Oct 2019 06:54:20 +0100
Merge branch 'master' of src.adamsgaard.dk:src/manus_continuum_granular1
Diffstat:
2 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/BIBnew.bib b/BIBnew.bib
@@ -9174,3 +9174,13 @@ Winton and A. T. Wittenberg and F. Zeng and R. Zhang and J. P. Dunne},
title = {Groundwater Flow Under a Paleo-Ice Stream of the Scandinavian Ice Sheet and Its Implications for the Formation of Stargard Drumlin Field, {NW} Poland},
journal = {J. Geophys. Res.: Earth Surf.}
}
+
+@article{Ungermann2017,
+ doi={10.1002/2016JC012128},
+ year=2017,
+ volume=122,
+ pages={2090--2107},
+ author={M. Ungermann and L. B. Tremblay and T. Martin and M. Losch},
+ title={Impact of the ice strength formulation on the performance of sa sea ice thickness distribution model in the Arctic},
+ journal = {J. Geophys. Res.: Oceans}
+}
diff --git a/continuum-granular-manuscript1.tex b/continuum-granular-manuscript1.tex
@@ -61,6 +61,26 @@ Deep deformation is most likely in tills with relatively high hydraulic permeabi
\section{Introduction}%
\label{sec:introduction}
+Fast glacier and ice-sheet flow often ocurrs over weak sedimentary deposits, and basal slip accounts for nearly all fast ice movement \citep[e.g.,][]{Cuffey2010}.
+
+Basal sediments, called subglacial till, commonly consist of a poorly sorted mix of reworked older sediment and erosional products.
+\citet{Hooke1995} demonstrated that the grain-size distribution is fractal.
+Water is generated at the ice-bed interface because of frictional heating, and saturates the sediment pore space.
+The pore-water pressure relieves some of the overburden ice weight, so that the compressive stress on granular skeleton is reduced to Terzaghi's effective stress \citep{Terzaghi1943}.
+
+
+The dynamics of the basal interface is not well understood.
+Many sweeping assumptions.
+We know that the assumptions matter, but not what to replace them with.
+
+% Early on, \citet{Boulton1987} concluded that subglacial till behaved mildly-non-linear viscous.
+
+Here comes you!
+Shed new unique light on this matter with a model that is related to granular-scale mechanics, but can be applied in an ice-sheet kind of setting.
+For that we need the continuum formulation is really hard, many other people have tried but it has been questionable and contradicts laboratory experiments.
+Here comes our contribution which is consistent with laboratory experiments, but we can also connect to field data because of the continuum scale, which no laboratory experiment can ever do.
+Building on new modeling advances in granular mechanics.
+
%% The review
% Pick out 3-10 papers providing background to my research and say something about each of them.
@@ -80,6 +100,16 @@ Increasing shear stress acts as a negative feedback on perturbations in glacier
The degree of non-linearity of subglacial till may pose drastically different ice-stream behavior \citep[e.g.,][]{Bougamont2011, Tsai2015} and contributions to global mean sea-level rise \citep[e.g.,][]{Parizek2013, Ritz2015}.
+
+The basal sediment mechanics
+\citet{Ritz2015}
+Early on, till was assumed to be mildly non-linear viscous with a constant rate dependence \citep{Boulton1987}.
+Increasing shear stress acts as a negative feedback on perturbations in glacier flow rate.
+
+
+The degree of non-linearity of subglacial till may pose drastically different ice-stream behavior \citep[e.g.,][]{Bougamont2011, Tsai2015} and contributions to global mean sea-level rise \citep[e.g.,][]{Parizek2013, Ritz2015}.
+
+
%% The claim
% Why the paper's agenda is a worthwile extension of the historical review.
% Personal pronouns should be used in the claim and anywhere else the author expresses judgement, opinion, or choice.
