add debris-covered glacier graphic (#131)

docs/glacier_debriscovered.rst

@@ -0,0 +1,48 @@
+.. _glacier_debriscovered:
+
+Debris-covered glaciers
+=======================
+
+.. figure:: https://raw.githubusercontent.com/OGGM/glacier-graphics/master/glacier_debriscovered/thumbnails/glacier_debriscovered_nolabels.png
+    :width: 100%
+
+
+A collection of free glacier graphics that can be used for education and
+outreach.
+
+
+**License**: `Creative Commons Attribution-ShareAlike 4.0 International License <https://creativecommons.org/licenses/by-sa/4.0/>`_
+
+.. figure:: https://licensebuttons.net/l/by-sa/4.0/88x31.png
+    :target: https://creativecommons.org/licenses/by-sa/4.0/
+
+
+Feel free to use / adapt the graphics, but always refer to the original author
+and share them with a compatible license.
+
+**Author**: Lindsey Nicholson (adapeted from Anne Maussion, `Atelier les Gros yeux <http://atelierlesgrosyeux.com>`_)
+
+This graphic was designed for the paper from `Nicholson et al., 2021 <https://doi.org/10.3389/feart.2021.662695>`_.
+It illustrates the processes of debris flux through a mountain glacier.
+
+**Download**: `zip file <https://github.com/OGGM/glacier-graphics/blob/master/glacier_debriscovered/glacier_debriscovered.zip?raw=true>`_
+
+Image with english labels
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: https://raw.githubusercontent.com/OGGM/glacier-graphics/master/glacier_debriscovered/thumbnails/glacier_debriscovered_englishlabels.png
+    :target: https://raw.githubusercontent.com/OGGM/glacier-graphics/master/glacier_debriscovered/png/glacier_debriscovered_englishlabels.png
+
+Rock debris from the surrounding landscape is transported by glacier ice motion,
+and some glaciers can develop into debris covered glaciers, with a layer of
+rock rubble covering part of their ablation zone. This debris cover alters
+the ablation rate of the glacier, and therefore its overall interaction with
+a forcing climate. Here is a schematic of the control and processes affecting
+debris covered glacier systems as presented in
+`Nicholson et al., 2021 <https://doi.org/10.3389/feart.2021.662695>`_.
+
+Image with no labels
+^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: https://raw.githubusercontent.com/OGGM/glacier-graphics/master/glacier_debriscovered/thumbnails/glacier_debriscovered_nolabels.png
+    :target: https://raw.githubusercontent.com/OGGM/glacier-graphics/master/glacier_debriscovered/png/glacier_debriscovered_nolabels.png

docs/index.rst

@@ -64,6 +64,7 @@ Graphics
 Open access images and graphics that can be used for lectures or presentations.
 
 * :doc:`glacier_basics`
+* :doc:`glacier_debriscovered`
 * :doc:`glacier_lowpass`
 
 .. toctree::
@@ -72,6 +73,7 @@ Open access images and graphics that can be used for lectures or presentations.
     :caption: Graphics
 
     glacier_basics.rst
+    glacier_debriscovered.rst
     glacier_lowpass.rst