期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 22, 页码 7882-7890出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061918
关键词
backwater; avulsions; Huanghe; delta; alluvial fan; shoreline
资金
- NSF [OCE-1233685]
- Terrestrial Hazard Observations and Reporting Center (THOR) at Caltech
- NCED2 synthesis postdoctoral funding
- NSFC [41376052]
- Directorate For Geosciences
- Division Of Earth Sciences [1427177, 1427262, 1427380] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1246761] Funding Source: National Science Foundation
A mechanistic understanding of river avulsion location and frequency is needed to predict the growth of alluvial fans and deltas. The Huanghe, China, provides a rare opportunity to test emerging theories because its high sediment load produces regular avulsions at two distinct nodes. Where the river debouches from the Loess Plateau, avulsions occur at an abrupt decrease in bed slope and reoccur at a time interval (607years) consistent with a channel-filling timescale set by the superelevation height of the levees. Downstream, natural deltaic avulsions reoccur at a timescale that is fast (7years) compared to channel-filling timescale due to large stage-height variability during floods. Unlike the upstream node, deltaic avulsions cluster at a location influenced by backwater hydrodynamics and show evidence for episodic downstream migration in concert with progradation of the shoreline, providing new expectations for the interplay between avulsion location, frequency, shoreline rugosity, and delta morphology.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据