Morphological adjustments of alternate bars in a channelized river of the Tibetan Plateau and their hydro-sedimentary implications
文献类型：期刊论文
| 作者 | Cheng, Yunshuo3; Li, Zhiwei3; He, Yucong3; Yu, Guo An2; Yao, Weiwei1 |
| 刊名 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 出版日期 | 2025-08-01 |
| 卷号 | 50期号:10页码:e70141 |
| 关键词 | alternate bars bar morphometrics channel stability fluvial changes human activities |
| DOI | 10.1002/esp.70141 |
| 产权排序 | 2 |
| 文献子类 | Article |
| 英文摘要 | Alternate bars are self-organized, large-scale bedforms that typically occur in channelized rivers and result from bed instability. Owing to the rapid morphological responses to changing flow and sediment regime, alternate bars can serve as sensitive indicators for reach-scale fluvial variations. The aspect is particularly relevant for the Tibetan Plateau rivers, where climatic and human disturbances are triggering rapid fluvial adjustments. We analysed alternate bars in the lower Nianchu River - a channelized tributary in the middle Yarlung Tsangpo River basin - by utilizing multi-temporal satellite imagery (2009-2012 and 2019-2021), field surveys and theoretical modelling. Key findings include: (1) a 1.5-fold decline in bar occurrence frequency (0.99 to 0.66 bars/km) and a 2.3-fold reduction in migration rates (0.36 to 0.16 channel widths/year) are observed in the recent decade, mirroring the decreased flow energy and sediment supply due to dam regulation, vegetation encroachment and altered hydrology in the midstream rivers in the Tibetan Plateau; (2) persistent bar wavelengths despite the above bar changes, indicating that hydro-sedimentary changes are not yet fundamental to alter the basic bar pattern, providing critical insights that water-sediment adjustments of midstream rivers in the Tibetan Plateau are gradual rather than abrupt; and (3) agreement of semi-empirical wavelength equation to the field data under a scaling factor of 0.7, confirming the transferability of experimental/theoretical models for natural rivers of high-altitude in bar management and regulations. Overall, morphological changes of alternate bars can provide critical insights to understand river responses to climate change and human activities. |
| URL标识 | 查看原文 |
| WOS关键词 | FINITE-AMPLITUDE ; MISSISSIPPI RIVER ; DYNAMICS ; GROWTH ; FLOW |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001566787400002 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/216029]  |
| 专题 | 陆地水循环及地表过程院重点实验室_外文论文 |
| 通讯作者 | Li, Zhiwei |
| 作者单位 | 1.Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China; 3.Wuhan Univ, State Key Lab Water Resources Engn & Management, Wuhan 430072, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Cheng, Yunshuo,Li, Zhiwei,He, Yucong,et al. Morphological adjustments of alternate bars in a channelized river of the Tibetan Plateau and their hydro-sedimentary implications[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2025,50(10):e70141. |
| APA | Cheng, Yunshuo,Li, Zhiwei,He, Yucong,Yu, Guo An,&Yao, Weiwei.(2025).Morphological adjustments of alternate bars in a channelized river of the Tibetan Plateau and their hydro-sedimentary implications.EARTH SURFACE PROCESSES AND LANDFORMS,50(10),e70141. |
| MLA | Cheng, Yunshuo,et al."Morphological adjustments of alternate bars in a channelized river of the Tibetan Plateau and their hydro-sedimentary implications".EARTH SURFACE PROCESSES AND LANDFORMS 50.10(2025):e70141. |
入库方式： OAI收割
来源：地理科学与资源研究所
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