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--- wiki:protection_forest_calc [2018/11/27 10:56] – marsth
+++ wiki:protection_forest_calc [2020/11/27 11:28] (current) – katharinalapin
@@ Line 3: / Line 3: @@
 ==== General description: ====
-The following model is an approach to delineate areas where the biotic ecosystems (forests) contribute to the mitigation of natural hazards and the protection of human assets from hazardous natural processes. At the Alpine-wide scale, this has been done by combining separate regional models for avalanches, rock-falls and water channel relevant processes. These models where created building on methods developed by the [[http://193.170.148.89/enfin/projects_proalp.html|ProAlp Project]] (Bauerhansel et al. 2009) and Voigt (2010). The models use topographical information derived from the 25m EU DEM and statistically derived threshold values identified by earlier projects and assessments (performed in all Alpine countries) to model potential avalanche and rock-fall release and transition zones. **The flowchart below** describes in detail the calculation procedure to derive the developed indicators per local administrative units (LAU2) of the Alpine Space.
+The following model is an approach to delineate areas where the biotic ecosystems (forests) contribute to the mitigation of natural hazards and the protection of human assets from hazardous natural processes. At the Alpine-wide scale, this has been done by combining separate regional models for avalanches, rock-falls and water channel relevant processes. These models where created building on methods developed by the [[http://193.170.148.89/enfin/projects_proalp.html|ProAlp Project]] (Bauerhansel et al. 2009) and [[http://unigis.sbg.ac.at/files/Mastertheses/Full/1500.pdf|Voigt (2010)]]. The models use topographical information derived from the 25m EU DEM and statistically derived threshold values identified by earlier projects and assessments (performed in all Alpine countries) to model potential avalanche and rock-fall release and transition zones. **The flowchart below** describes in detail the calculation procedure to derive the developed indicators per local administrative units (LAU2) of the Alpine Space.
 ==== Input data ====
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 **(3) Calculate avalanche cost path:**<font inherit/inherit;;windowtext;;inherit>The cost path represents the easiest way down a slope following the highest elevation differences from one raster pixel to the next. In Arc GIS this can be accomplished with the tool (cost path) using the Flow-Direction as Cost Backlink raster and the DEM as Cost Distance Raster.</font>
-**(4) Calculate energy line angle for every release area:**<font inherit/inherit;;windowtext;;inherit>The energy line,</font><font inherit/inherit;;windowtext;;inherit>or</font><font inherit/inherit;;windowtext;;inherit>generalized</font><font inherit/inherit;;windowtext;;inherit>gradient</font><font inherit/inherit;;windowtext;;inherit>, represents the angle of the connecting line from the release point and the outer edge of the run out zone of a mass movement with the horizontal plan. (Bauerhansel et al 2009)</font>
+**(4) Calculate energy line angle for every release area:**<font inherit/inherit;;windowtext;;inherit>The energy line,</font><font inherit/inherit;;windowtext;;inherit>or</font><font inherit/inherit;;windowtext;;inherit>'generalized</font><font inherit/inherit;;windowtext;;inherit>gradient</font><font inherit/inherit;;windowtext;;inherit>'</font><font inherit/inherit;;windowtext;;inherit>, represents the angle of the connecting line from the release point and the outer edge of the run out zone of a mass movement with the horizontal plan. (Bauerhansel et al 2009)</font>
 ====   ====
@@ Line 81: / Line 81: @@
 **(15) Backlink intersections of hazard potential and damage potential to release areas:**In the case of avalanches all the transition zones that intersect with infrastructure have to be traced back to the corresponding release area. Using Raster in ArcGIS, this can be done by inverting the DEM and performing a new cost path analysis starting from the intersected damage potential areas. Finally, by combining the avalanche release and transition zones as well as rockfall transition zones that possibly harm infrastructure we are able to identify Object-protecting forest.
-{{:en:protection_forest_flowchart_f1.jpg?nolink&1643x2001}}
+{{:en:protection_forest_flowchart_f1.jpg?nolink&1643x2001|protection_forest_flowchart_f1.jpg}}
-{{:en:test_legens.jpg?nolink&500x297}}
+{{:en:test_legens.jpg?nolink&500x297|test_legens.jpg}}
 <font 18px/inherit;;inherit;;inherit>**Flowchart depicting the procedures used to derive the supply, flow and demand indicators**</font>