Processes and mechanisms of dynamic channel adjustment to delta progradation: The case of the mouth channel of the Yellow River, China
文献类型：SCI/SSCI论文
| 作者 | Shi C. X. ; Zhang D. |
| 发表日期 | 2003 |
| 关键词 | Yellow River mouth delta progradation channel adjustment hydrologic regime frequency magnitude geometry |
| 英文摘要 | This paper analyses the processes and mechanisms of a three-stage channel adjustment over a cycle of the Yellow River mouth channel extension based on data comprising hydrologic measurements and channel geometric surveys. Rapid siltation in the mouth channel takes place in the young stage when the channel is being built by deposits and in the old stage when the channel cannot further adjust itself to keep sediment transport in equilibrium. It is disclosed that the bankfull width-depth ratio, bed material size and slope decrease in the young and mature stages but do not change in the old stage. The reduction of bankfull width-depth ratio and bed material size during the young and mature stages is found to be able to offset the effect of the slope reduction on sediment transport due to continuous mouth progradation. They reach their limits in old stage, and a constant slope is kept by unceasing sediment accumulation. The grain size composition of incoming sediment and the fining mechanism are responsible for the occurrence of lower limit of bed material size. The reason for the existence of a limit of bankfull cross-sectional shape is that the large flows can fully transport the sediment load they are carrying, and siltation in the channel in the old stage takes place mainly in the low flows. It is suggested that the bankfull discharge plays an important role in shaping the channel but that the entire channel form is the product of both the large and low flows plus the effects of interaction between them. Channel pattern change shows a process from a braided pattern in the young stage to a straight pattern in the mature and old stages, and the straight channel becomes gradually sinuous. The occurrence and transformation of the channel patterns are supported by two planform predictors, but are also facilitated by some other conditions. Copyright (C) 2003 John Wiley Sons, Ltd. |
| 出处 | Earth Surface Processes and Landforms |
| 卷 | 28 |
| 期 | 6 |
| 页 | 609-624 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0197-9337 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23094]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Shi C. X.,Zhang D.. Processes and mechanisms of dynamic channel adjustment to delta progradation: The case of the mouth channel of the Yellow River, China. 2003. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。