add monthly apr 21 and version 0.3

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+---
+title: "This month in AvaFrame - April 2021 edition"
+date: 2021-05-05T17:08:58+01:00
+draft: false
+---
+
+Welcome to the April 2021 edition of our monthly update. 
+
+Apart from the release of version 0.3, we put a lot of effort into our
+python/cython dense flow avalanche module *com1DFAPy*, targeting a swap with
+*com1DFA* within the next month:
+
+ com1DFAPy now includes:
+  
+  - an additional particle initialisation method: the *per depth* method
+
+  - the option to use secondary release areas. They are being triggered if
+  particles enter the area of a secondary release area.
+
+  - split simulation types for entrainment and resistance. So far only a
+    combined type existed. This allows for more granular and easier control of
+    different simulation setups.
+
+  - distinguish grid size used for the normal computation and for interpolating
+  the fields from the grid used for neighbour search (kernel smoothing length).
+
+  - an option to remesh the input DEM
+
+  - better output options to reduce computational costs (mainly RAM usage)
+
+  - proper handling of overlapping release areas 
+   
+The second big block tackles reporting and visualisation:
+
+ output options for visualisation in *Paraview*
+
+ introduce constraining plots to data plus a buffer zone
+
+ generate report and plots to validate the entrainment
+
+ update benchmark files, ini files and run scripts to new options
+
+ improve Aimec plots (add some statistical information about the error)
+
+And last but not least, this month also saw us also focusing on getting things ready for the EGU:
+
+ a new page was introduced in our docu about
+  [testing](https://docs.avaframe.org/en/latest/testing.html) including an
+  example of a full report of our standard tests. There you'll also find all
+  available test topographies. 
+
+ we presented these tests and our strategy at EGU21, see
+  [abstract](https://doi.org/10.5194/egusphere-egu21-6560) and [publicly
+  available video](https://www.youtube.com/watch?v=GS7zdlByLQE).
+
+Felix