Characteristics of landslides in western Colorado, USA

摘要: Mass movement can be activated by earthquakes, rapid snowmelt, or intense rainstorms in conjunction with gravity. Whereas mass plays a major role the evolution of hillslope modifying slope morphology and transporting material from to valley, it is also potential natural hazard. Determining relationships frequency magnitude landslides are fundamental understanding study landscape evolution, hazard assessment, determination rate denudation. We mapped 735 shallow active Paonia McClure Pass area western Colorado aerial photographs field surveys. The covers ∼815 km2. frequency–magnitude illustrate flux debris area. comparison probability density double Pareto curve, defined power scaling for negative (α), positive (β), location rollover (t), shows that α = 1.1, β = 1.9, t = 1,600 m2 areas α = 1.15, β = 1.8, t = 1,900 m3 volumes landslides. total 4.8 × 106 m2 volume 1.4 × 107 m3. (A) (V) related V = 0.0254 × A 1.45. analysis ranging size 1,600 20,000 m2 most hazardous These frequent do significant amount geomorphic work. developed conceptual model development upland plateau driven river incision, landsliding, deep-seated large landsliding. gentle flat dominated Quaternary was modified present steep rugged topography combined action fluvial incision glacial processes response rock uplift, very-frequent less-frequent