For many people it is difficult to understand the motion concept of rocks along the slopes, in this interesting video shot in New Zealand (Christchurch) from GNScience Chris Massey analyses rockfall hazards to assist Christchurch recovery planning and discusses many issues related to unpredictable prevents this phenomenon.
At 4.17 minute of the video is very interesting to observe the deviation of the block (aprx. 40 °) respect the line of maximum slope angle ........ only for a little impact point with a rock outcrop present on the slope.!!!!!
This is very difficult to take into account with the rockfall analisys two dimensional and probably for this type of activities the better solutions is the 3D software.
In any case for my experiences the rebounding height is much more unpredictable than the rock energy. For this reason, my assumption design of heght protection measures is based on model described belowe.
Probably can be other parameter to take in accont and in this way are welcome advice on other experiences.
ciaoooo
Thomas
