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Middle Holocene palaeoflood extremes of the Lower Rhine

机译:下莱茵的中全新世古洪水极端

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摘要

A Chezy-based hydraulic model was run to estimate the magnitude of extreme floods of Middle Holocene age in the Lower Rhine Valley (Germany). Input parameters were gathered from the field and literature, and used in ten scenarios to calculate a best guess estimate for the minimum size of extreme floods. These events have been registered as slackwater deposits on elevated terrace levels and in a palaeochannel fill. The modelled minimum discharge is 13,250 m3 sec"1 for a Middle Holocene flood with an estimated recurrence interval between 1,250 and 2,500 years. A sensitivity analysis on different input parameters enables evaluation of factors which cause the relatively large range in modelled discharges. Understanding the origin of uncertainties in modelled discharges is important for making geologically based calculations of palaeoflood magnitudes important in modem flood frequency analyses, which generally lack information on the magnitudes of rare events.
机译:运行了一个基于Chezy的水力模型来估计下莱茵河谷(德国)的中全新世年龄的极端洪水的规模。输入参数是从野外和文献中收集的,并在十种情况下用于计算极端洪水的最小规模的最佳猜测估计。这些事件已被记录为高阶阶地和古河道填充物中的松散水沉积物。对于中全新世洪水,模拟的最小排放量为13,250 m3 sec“ 1,估计的复发间隔在1,250至2,500年之间。对不同输入参数的敏感性分析可以评估造成模拟排放量相对较大范围的因素。了解起源建模排放量的不确定性对于使基于地质模型的古洪水幅度计算在现代洪水频率分析中很重要,而现代洪水频率分析通常缺乏有关罕见事件强度的信息。

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