I am hoping to identify sections of a trail system which are close enough to potentially add sediments to wetlands downhill.
To this end, I would like to select polygons (wetlands) that are within a given distance (say 50m) below/downhill of polylines (trails) based on a 10m DEM raster.
Is there a way to buffer a line downhill a given distance? Or alternatively, is there a way to select by location in 3D? Any thoughts on potential workflows?
I am hoping that once I find a solution, I would be able to incorporate this process into model using ModelBuilder.
I am using ArcMap 10.2, have access to Spatial Analyst, 3D Analyst and most other tools.