Complex morphodynamic processes of a large braided channel in response to different flood flow discharges on the Qinghai-Tibet Plateau
文献类型：期刊论文
| 作者 | Ouyang, Weiqi1; Li, Zhiwei1; Lu, Hanyou2; Cheng, Yunshuo1; Yu, Guo-An3; Yao, Weiwei4; Cao, Zhixian1 |
| 刊名 | INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
 |
| 出版日期 | 2025-06-01 |
| 卷号 | 40期号:3页码:439-453 |
| 关键词 | Braided channel Morphodynamic processes Numerical simulation Runoff change Climate warming |
| ISSN号 | 1001-6279 |
| DOI | 10.1016/j.ijsrc.2025.01.008 |
| 产权排序 | 3 |
| 文献子类 | Article |
| 英文摘要 | The frequency and intensity of river floods in the Qinghai-Tibet Plateau (QTP) are increasing under the background of climate warming. In particular, the braided channel in the wide valley section in the Source Region of the Yangtze River (SRYR) has undergone drastic adjustments due to recent summer floods and further adjustments are expected in the future as climate change continues. Nonetheless, a lack of a quantitative description of the phenomenon persists. In order to unravel morphodynamic processes of a braided river under different flood flow discharges, a two-dimensional morphodynamic model was established using Delft3D to simulate the local braided channel in the Tuotuo River based on field observations and remote sensing images in the SRYR. The data of 1, 2, 5, and 10-yr flood hydrographs from 1985 to 2020 were obtained, using the hydrological data at the Tuotuohe Gauging Station. Specifically, two groups of actual flood hydrographs were used to simulate the hydrodynamic and riverbed adjustment of the braided channel reach. The following findings were revealed: (i) increases in discharge cause increases of the water level, and thus the flood flow erode and submerge the sandbars. During a flood, the previous branches are replaced by new branches and the braided channel shows a significantly different configuration after the flood. (ii) With the increase of the flood discharge, the amount of sediment erosion and deposition in the braided channels escalates. Specifically, the sediment erosion and deposition of the 10-yr flood will increase by 3.1 times and 4.7 times, respectively, in comparison with the 1-yr flood. (iii) When the discharge is greater than 180 m(3)/s, the braiding intensity in the wide valley section (>1.2 km) has a significant decreasing trend with the increase in the flood flow. When the discharge is less than 180 m(3)/s, the correlation between the braiding intensity and flood flow is not significant in the wide reach. (iv) The braiding intensity of the wide reach as flood frequency increases from the 1- to 2-yr events increases by 14.3%, 11.6%, respectively, and decreases for the 5- to 10-yr events by 3.2% and 10.8%, respectively. In the narrow reach, the increases are 25.5% and 11.2%, for the 1- and 2-yr events, respectively, and the decreases are 25.0% and 53.3% for the 5- and 10-yr events, respectively. The parabolic shape of the correlation between the braided intensity and flood discharge increases first, reaches a peak, and then decreases. Overall, the current study contributes to the understanding of the impact of gradually increasing flood discharge on the morphodynamics of braided rivers in the QTP. (c) 2025 International Research and Training Centre on Erosion and Sedimentation. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY |
| URL标识 | 查看原文 |
| WOS关键词 | SEDIMENT TRANSPORT ; CLIMATE-CHANGE ; RIVER ; IMPACTS ; EROSION ; RUNOFF ; MODELS |
| WOS研究方向 | Environmental Sciences & Ecology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001515667600001 |
| 出版者 | KEAI PUBLISHING LTD |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/214543]  |
| 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.Wuhan Univ, State Key Lab Water Resources Engn & Management, Wuhan 430072, Peoples R China; 2.Hunan Inst Water Resources & Hydropower Res, Changsha 410007, Peoples R China; 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China; 4.Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ouyang, Weiqi,Li, Zhiwei,Lu, Hanyou,et al. Complex morphodynamic processes of a large braided channel in response to different flood flow discharges on the Qinghai-Tibet Plateau[J]. INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,2025,40(3):439-453. |
| APA | Ouyang, Weiqi.,Li, Zhiwei.,Lu, Hanyou.,Cheng, Yunshuo.,Yu, Guo-An.,...&Cao, Zhixian.(2025).Complex morphodynamic processes of a large braided channel in response to different flood flow discharges on the Qinghai-Tibet Plateau.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,40(3),439-453. |
| MLA | Ouyang, Weiqi,et al."Complex morphodynamic processes of a large braided channel in response to different flood flow discharges on the Qinghai-Tibet Plateau".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 40.3(2025):439-453. |
入库方式： OAI收割
来源：地理科学与资源研究所
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