I'm working with ArcGIS 10.7 to investigate lakes in the mountains. I have created a 2km "hazard buffer" around every lake-TIN showing instable slopes (>40°) above the lake surface from where a rockfall could hit the lake (see example below).
However, not all of the slopes inside the buffer are pointing towards my lake, some of them are on the other side of ridges, naturally.
I need to identify every mountainside with a slope >40° that is pointing towards my lake and classify them depending on their distance and height difference to the lake. The distance and height difference should not be too difficult to figure out (I hope) - but I struggle with the slope detection.
How could I use
aspect or some other criteria to determine which slopes to keep?
EDIT: I know that my question is relatively broad. However, I'm not looking for a detailed workflow but for hints or tips on what I might look into.