Slope control on the frequency distribution of shallow landslides and associated soil properties, North Island, New Zealand

摘要: The extrapolation of results from field trials to larger areas land for purposes regional impact assessment is an important issue in geomorphology, particularly landform properties that show high stochastic variability space and time, such as shallow landslide erosion. It shown this study, by identifying the main driver spatial erosion at scales, namely slope angle, it possible develop a set generic functions assessing landslides on selected soil scales over longer time periods. Research was conducted within area pastoral soft-rock Tertiary hill country North Island New Zealand subject infrequent intensity rainfall events, producing numerous landslides, most which are smaller than several hundred square metres size remove depths. All were mapped 0·6 km2 registered resolution (2 m) map few occur slopes   24°. areal density all historical events showed approximately linear increase with above 24°. Integrating densities recovery data demonstrates average value property fluctuates ‘saw-tooth’ fashion through overall shape curve controlled frequency inducing storm rate between events. Despite fluctuations, there gradual declines 7·5% total carbon content topsoil 9·5% depth bedrock, since forest clearance. Results have application large-scale sediment budget water quality models Soil Carbon Monitoring System (CMS). Copyright © 2012 John Wiley & Sons, Ltd.