Mass movements along a rapidly uplifting river valley: an example from the upper Jinsha River, southeast margin of the Tibetan Plateau

摘要: Because of the rapid uplift Tibetan Plateau since middle and late Pleistocene, surrounding mountainous areas also show a trend. The study area is located in upper reaches Jinsha River, southeastern Plateau. Tectonically, eastern segment Jinshajiang suture zone, which weak belt lithosphere. Affected by uplift, steep slopes are formed vertical down-cutting rivers studied reach. Under sustained action gravitational field, deformation failure readily occur. To better formulate development risk mitigation plans, mass movement inventory map at scale 1:50,000 was prepared for 100 km long A total 247 movements different types, sizes relative ages were mapped via image interpretation detailed field survey. statistical analysis their spatial distributions performed using two concentration indexes. correlations between distribution six common factors analyzed: elevation, slope angle, aspect, lithology, active fault, river system. geomorphological survey shows that locally play an important role present-day landscape evolution. In addition, geomorphic features indicate giant landslides can be classified as very old landslides, they likely occurred under morphoclimatic environment than present.