Evolution of eastern Tibetan river systems is driven by the indentation of India

作者：Yi Chen, Baosheng Wu, Zhongyu Xiong, Jinbo Zan, Bangwen Zhang, Ruoyin Zhang, Yuan Xue, Minhui Li, Bingshuai Li · 发表于：Communications Earth & Environment · 年份：2021 · DOI：10.1038/s43247-021-00330-4 · 被引用次数：16 · 研究领域：Geology and Paleoclimatology Research、Hydrology and Sediment Transport Processes、Landslides and related hazards

Abstract The main rivers that originate from the Tibetan Plateau are important as a resource and for the sedimentary and biogeochemical exchange between mountains and oceans. However, the dominant mechanism for the evolution of eastern Tibetan river systems remains ambiguous. Here we conduct geomorphological analyses of river systems and assess catchment-average erosion rates in the eastern Tibetan Plateau using a digital elevation model and cosmogenic radionuclide data. We find that major dividing ranges have northeast oriented asymmetric geometries and that erosion rates reduce in the same direction. This coincides with the northeastward indentation of India and we suggest this indicates a primarily tectonic influence on the large-scale configuration of eastern Tibetan river systems. In contrast, low-level streams appear to be controlled by fluvial self-organization processes. We propose that this distinction between high- and low-order channel evolution highlights the importance of local optimization of optimal channel network models in tectonically active areas.