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<p>Global warming significantly impacts the hydrological processes of rivers in the Yangtze River source region in China. The Beilu River is a typical braided river located in the core area of the Yangtze River source region and has a rapid response to a warming and wetting climate. This study quantitatively investigated the river width and braiding intensity of the Beilu River from 1990 to 2023. The results show that the mean river width increased from 580.9&#xa0;m (1990–1994) to 712.1&#xa0;m (2019–2023), yielding a lateral channel expansion rate of 4.3&#xa0;m per year. The mean braiding intensity was 3.8 from 1990 to 1994 and increased to 6.4 from 2019 to 2023. Rising temperatures and precipitation have led to permafrost degradation, driving the widening and increased braiding of the Beilu River over the past three decades, with regional variations influenced by the underlying topography. Loose geological conditions and sparse riparian vegetation weaken riverbank stability, accelerating erosion and channel expansion. These results shed light on how climate change can reshape braided rivers in permafrost regions, offering useful guidance for future studies and basin management.</p>

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A warming and wetting climate increases the width and intensity of braided channels in the Yangtze River source region: a case study of the Beilu River

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Qianyue Guo,
  • Tingting Jiang,
  • Jinpo Li,
  • Zhipeng Lin,
  • Yuqi Shan,
  • Chao Liu

摘要

Global warming significantly impacts the hydrological processes of rivers in the Yangtze River source region in China. The Beilu River is a typical braided river located in the core area of the Yangtze River source region and has a rapid response to a warming and wetting climate. This study quantitatively investigated the river width and braiding intensity of the Beilu River from 1990 to 2023. The results show that the mean river width increased from 580.9 m (1990–1994) to 712.1 m (2019–2023), yielding a lateral channel expansion rate of 4.3 m per year. The mean braiding intensity was 3.8 from 1990 to 1994 and increased to 6.4 from 2019 to 2023. Rising temperatures and precipitation have led to permafrost degradation, driving the widening and increased braiding of the Beilu River over the past three decades, with regional variations influenced by the underlying topography. Loose geological conditions and sparse riparian vegetation weaken riverbank stability, accelerating erosion and channel expansion. These results shed light on how climate change can reshape braided rivers in permafrost regions, offering useful guidance for future studies and basin management.