Flow directionality of pristine meandering rivers is embedded in the skewing of high-amplitude bends and neck cutoffs
文献类型：期刊论文
| 作者 | Guo, Xingyan2,3; Chen, Dong2,3 ; Parker, Gary1,4
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| 刊名 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
 |
| 出版日期 | 2019-11-19 |
| 卷号 | 116期号:47页码:23448-23454 |
| 关键词 | alluvial rivers meandering flow direction planform skewing bends |
| ISSN号 | 0027-8424 |
| DOI | 10.1073/pnas.1910874116 |
| 通讯作者 | Chen, Dong(dchen@igsnrr.ac.cn) ; Parker, Gary(parkerg@illinois.edu) |
| 英文摘要 | Information concerning the dynamics of river meandering is embedded in their planforms. Here, we focus on how bend skewing varies with increasing sinuosity, and how flow direction is embedded in bend skewing. It has often been thought that upstream-skewed bends are dominant within a sufficiently long reach. These bends may allow a reasonable inference as to the direction of flow. Here we consider this issue using 20 reaches of freely meandering alluvial rivers that are in remote locations, generally far from human influence. We find that low-amplitude bends tend to be downstream-, rather than upstream-skewed. Bends with sinuosity greater than 2.6, however, are predominantly upstream-skewed. Of particular interest are the neck cutoffs, all chosen to be relatively recent according to their position related to the main channel: 84% of these are upstream-skewed. Neck cutoffs, which have likely evolved directly from bends of the highest sinuosity, represent the planform feature most likely to have flow direction embedded in them. The field data suggest that meander bends without external forcing such as engineering works tend to evolve from downstream-skewed low-sinuosity bends to upstream-skewed high-sinuosity bends before cutoff. This process can be reproduced, to some extent, using models coupling sedimentary dynamics with flow dynamics. |
| WOS关键词 | CHANNEL MIGRATION ; UPSTREAM INFLUENCE ; SELF-ORGANIZATION ; FLOODPLAIN ; PART ; MORPHODYNAMICS ; DOWNSTREAM ; SIMULATION ; SINUOSITY ; EVOLUTION |
| 资助项目 | National Key R&D Program of China[2017YFC0405203] ; National Natural Science Foundation of China[51779242] |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:000498683000018 |
| 出版者 | NATL ACAD SCIENCES |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/130052]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Chen, Dong; Parker, Gary |
| 作者单位 | 1.Univ Illinois, Dept Geol, Urbana, IL 61801 USA 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 4.Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA |
| 推荐引用方式 GB/T 7714 | Guo, Xingyan,Chen, Dong,Parker, Gary. Flow directionality of pristine meandering rivers is embedded in the skewing of high-amplitude bends and neck cutoffs[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(47):23448-23454. |
| APA | Guo, Xingyan,Chen, Dong,&Parker, Gary.(2019).Flow directionality of pristine meandering rivers is embedded in the skewing of high-amplitude bends and neck cutoffs.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(47),23448-23454. |
| MLA | Guo, Xingyan,et al."Flow directionality of pristine meandering rivers is embedded in the skewing of high-amplitude bends and neck cutoffs".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.47(2019):23448-23454. |
入库方式： OAI收割
来源：地理科学与资源研究所
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