The West Qinling is located at the northeastern Tibetan Plateau, it is the front part of the outward growth of the Tibetan Plateau during the Late Cenozoic. And the fluvial systems developed along the West Qinling, which was resulted from the northeastward expansion of the Tibetan Plateau, had recorded the evolutionary information of landscape during the outward expansion of the Tibetan Plateau. In this paper, the longitudinal profiles of the upper Jialing River Basin and the spatial patterns of normalized channel steepness were analyzed. Based on the geomorphic parameters, we have discussed the general landscape characters of the upper Jialing River Basin and its influence factors. The results indicated that the landscape evolution of the upper Jialing river basin is in a transient state. The upstream basin of knickpoints represent the relict landscapes and downstream basin of knickpoints is the new landscape which is in the process of adjusting to the base-level fall. Local comparisons of the knickpoint development and channel steepness revealed that the lithology and precipitation have limited influence on the knickpoint development and spatial patterns of channel steepness. The knickpoint development and the variations of channel steepness were controlled by the base-level fall which was caused by the tectonic uplift. The spatial patterns of normalized channel steepness revealed that the tectonic force plays a significant role in shaping the landscape. The development of the transient geomorphic in the West Qinling is a response to the remote effects since the Indian plate and Eurasian plate collision.
Shi Xiaohui Yang Zhao Dong Yunpeng Wang Shidi Zhou Bo. Transient geomorphic characteristics of the upper Jialing River Basin, West Qinling,northeastern Tibetan Plateau[J]. Chinese Journal of Geology, 2018, 53(3): 819-834.