[SoC] Final report

Silvia Franceschi silvia.franceschi at gmail.com
Tue Aug 16 02:55:36 PDT 2016

Dear all,
here is the final report of my GSoC2016.

A link to my commits:

My project focused on the scientific improvement of the tools for the
evaluation of Large Wood flooding in the JGrassTools library developed
during the GSoC2014 and their porting in gvSIG. In particular I added two

- the evaluation of the hydraylics conditions in each sections calcuated
using a simplified 1D model used to estimate the maximum widening of the
sections (inundable river corridor) and to establish a second criteria for
the propagation of the logs downstream based on the water depth and the
diameter of the vegetation
- the possibility to handle detailed vegetation data as vector layer of
single trees with the height as attribute

Before this improvements the tools for the evaluation of the hazard derived
from the transportation of Large Wood during floods used a simplified
approach in two aspects. Firs of all they didn't consider the hydraulic
conditions of the flow in the sections for the evaluation of the maximum
possibile widening. This means that the inundable area was calculated using
an experimental power law based on the slope and on the original width of
the section. The second aspect was that the tools derived the vegetation
data from the raster maps of CHM (Canopy Height Model) and the FSV (Forest
Stand Volume), without giving the possibility to use more detailed
vegetation information previously derived from an analysis of LiDAR data
with an approach single tree.

With these last development the tools for Large Wood Flooding are more
completed and stable and it is possible to use them practically for the
evaluation of the hazard derived from the transportation of woods in the
river during flooding events without too many simplifications. In addition,
the integration of the JGrassToools in gvSIG gives the user the possibility
to use a nice graphical interface, to select the input layers directly from
the ones loaded in the active View and to directly visualize the output of
each single module. Finally, in gvSIG it is possible to visualize the data
and the results in 3D using NWW for a nice visualization to show to the
administration and to the citizens.

With this model the user will be able to make an analysis of the hazard and
risk related to the transport of wood during flooding events on a complete
river stream with known and commonly used/available GIS data, using
directly a GIS for displaying input and outputs.

The LWTools will be soon (during the next weeks) integrated in the last
version of the JGrassTools library and they will be available for the
installation in gvSIG using the standard tool for adding new
functionalities (Tools -> Add-ons manager). More details on the
installation will be available in the JGrassTools wiki.

A tutorial for using the LWTools is available here

A slide summarizing the LWTools is available here

Thanks to the OSGEO community and in particular to my mentors for the


ing. Silvia Franceschi
Via Latemar, 22
38030 Castello di Fiemme (TN)

tel: 0039 -3384501332
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