Assessing Rockfall Activity in a Mountain Forest – Implications for Hazard Assessment

摘要: Rockfall represents the most intensely studied geomorphic process in mountainous areas. Nevertheless, very little information exists on how rockfall frequencies and magnitudes vary over time hazards risks posed by could be reliably assessed. Former studies have mainly focused short-term observations of contemporary activity (Luckman 1976, Douglas 1980), rendering it difficult to estimate long-term accretion rates. Long-term estimates accumulation rates have, contrast, been derived from accumulated talus volumes (Rapp 1960), but such may neither representative present-day activities nor those that prevailed past. On slopes composed siliceous lithologies, lichenometry has repeatedly used evaluate mean age or surfaces (Andre 1997) Fiske 1995).