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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Quantifying sediment storage on the floodplains outside levees along the lower Yellow River during the years 1580-1849
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Quantifying sediment storage on the floodplains outside levees along the lower Yellow River during the years 1580-1849

机译：在1580-1849年沿着下黄河沿着下黄河外堤坝泄漏的沉积物储存

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摘要

The lower Yellow River channel was maintained by artificial levees between 1580 and 1849. During this period, 280 levee breaches occurred. To estimate sediment storage on the floodplains outside the levees, a regression model with a decadal time step was developed to calculate the outflow ratio for the years when levee breaching occurred. Uncertainty analysis was used to identify the likely outflow ratio. Key variables of the model include annual water discharge, a proxy for levee conditions, and potential bankfull discharge of the channel before flood season. Uncertainty analysis reveals an outflow ratio of 0.35-0.56. We estimate that during this period, 18.8-30.1% of the total similar to 312 Gt of sediment load was deposited on the floodplains outside the levees. Human-accelerated erosion in the Loess Plateau caused a 4-fold increase in sediment delivery to the lower Yellow River, which could not be accommodated by channel morphodynamic changes. As a result, 21.2-27.5% of the total sediment load was deposited within the levees, creating a super-elevated channel bed that facilitated an uncommonly high breach outflow ratio. Hence, the factor of a large super-elevation relative to the mean main channel depth should be considered when designing diversions to restore floodplains. (c) 2018 John Wiley & Sons, Ltd.
机译：较低的黄河通道由1580和1849年之间的人工堤坝维持。在此期间，发生了280个堤坝违规行为。为了估算堤坝外部泄漏池的沉积物存储，开发了一种具有分层时间步骤的回归模型来计算堤防突破时多年的流出比。不确定性分析用于识别可能的流出比。该模型的关键变量包括年度排水，堤防条件的代理，以及汛期前渠道的潜在银行排放。不确定性分析显示出流出比为0.35-0.56。我们估计在此期间，占堤坝外洪水沉积物的18.8-30.1％。黄土高原中的人类加速侵蚀引起了4倍的沉积物递送到下黄河，不能通过通道形态动力学变化容纳。结果，21.2-27.5％的总沉积物载荷沉积在堤坝内，产生超高升高的通道床，便于一种罕见的高突破流出比。因此，在设计转移以恢复泛洪平坦时，应考虑相对于平均主沟道深度的大超高升高的因素。 （c）2018 John Wiley＆Sons，Ltd。

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