The interplay of tectonic, climatic, and erosional processes controls topography and in turn steep alpine environments are characterized by high erosion rates (Montgomery & Brandon, 2002;Whipple et al., 1999). Climate affects mechanical weathering, including frost cracking processes (Eppes & Keanini, 2017), that breakdown rock (Matsuoka & Murton, 2008). This rock is subsequently transported by rockfall processes (Krautblatter & Dikau, 2007) and results in erosion of rockwalls. Rockwall erosion rates also depend on in situ stress, geological, hydrological, and biological conditions (Krautblatter & Moore, 2014). Field measurements of rockwall erosion using rockfall collectors suggest that rockfall is influenced by seasonal ice segregation (Matsuoka & Sakai, 1999;Sass, 2005c) and volumetric expansion caused by short-term freezing