Delayed response of river sediment to drainage reorganization in the arid and semi-arid regions
Li, Menghao ， Hu, Zhenbo ， Wang, Ping ， Mo, Qinhong ， Pan, Baotian ， Garzanti, Eduardo
2026-06-30 CATENA 2026 268(卷), null(期), (null页)
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Provenance analysis provides fundamental insight to better understand erosion and sediment transport in river systems. Whereas most previous studies focused on tectonic or orbital timescales, we here specifically investigate the millennial-scale sediment response to a drainage reorganization event occurred similar to 2000 years ago in the Wuding River, a tributary of the Yellow River in Chinese Loess Plateau, northern China. Despite the drainage reorganization, with terraces forming, UPb detrital-zircon geochronology shows limited evidence of change in downstream sediments. This suggests the condition of arid climate delayed the response of river sediment system, and human activities have further increased the lag time. In contrast to more efficient transmission of detrital signals under wetter conditions. These findings reveal the complexities of sediment dynamics in dryland rivers and offer insights into the interconnections among human activity, climate change, and landform in the East Asian monsoon regions.
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