The main goals of the investigation are to quantify rockfall from rock
faces and to improve rockfall models. Up to now quantification of
rockfall was done by indirect measurements on the rockfan, for example
by nets. These methods were error-prone and did not consider for example
lithological differences on the rock faces. So a differentiation between
primary (weathering) and secondary rock fall (fluvial erosion) was not
possible. So without this dif-ferntiation an exact quantification of
erosion by weathering on rock faces is not feasible. In the presented
research project a high resolution Terrestrial Laserscanner (Riegl LMS
Z420ii) is used to quantify weathering on rock faces by multitemporal
measurements (twice to thrize a year). Aditionally the rockfans are
scanned too. So the runout distance of rocks can be determined. These
measurements are done in three alpine catchments, which are situated in
the northern (Wettersteinmountains near Garmisch Partenkirchen,
Germany), the central (Oetztal, Austria) and the southern part
(Villnoesstal, Italy) of the alps. The three catchments have different
climatic and lithologic conditions (Limestone, gneiss, dolomite). Beside
the quantification of rockfall activity the measurements can help to
develop rockfall models and to improve existing rockfall models. With
the high reolution spatiotemporal data the disposition for rockfall
activity can be modelled and so active areas on a rock face can be
differentiate from inactive areas. By knowing the starting areas of rock
fall and knowing the runout distances of rocks on rock fans, existing
process models which predict runout distances, can be improved. The
submitted poster presentation should show first analyses and results of
the project which started in fall 2007.