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Testing morphodynamic controls on the location and frequency of river avulsions on fans versus deltas: Huanghe (Yellow River), China

机译:测试河床扇动与三角洲撕脱的位置和频率的形态动力学控制:中国黄河(黄河)

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摘要

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 (607 yrs) 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 (7 yrs) 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.
机译:需要对河流撕裂位置和频率有一个机械的理解,以预测冲积扇和三角洲的增长。中国的黄河,提供了难得的机会来检验新兴理论,因为其高的泥沙负荷会在两个不同的节点上产生规律的撕脱。在河流从黄土高原发泄的地方,崩塌发生在河床坡度突然减小的情况下,并在一定的时间间隔(607 yrs)内再次发生,该时间间隔与由堤防的超高高度设定的河道充满时间尺度一致。下游自然三角洲撕脱发生的时间尺度比通道填满的时间尺度要快(7年),这是由于洪水期间的高度高度可变性所致。与上游节点不同,三角洲剥蚀聚集在受回水水动力影响的位置,并与海岸线的发展相一致地证明了下游的周期性迁移,为剥蚀位置,频率,海岸线的褶皱度和三角洲形态之间的相互作用提供了新的期望。

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