Channel response to a dam-removal sediment pulse captured at high-temporal resolution using routine gage data,Earth Surface Processes and Landforms

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Channel response to a dam-removal sediment pulse captured at high-temporal resolution using routine gage data
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2021-01-28 , DOI: 10.1002/esp.5083
Matthew J. Cashman ₁ , Allen Gellis ₁ , Eric Boyd ₁ , Mathias Collins ₂ , Scott Anderson ₃ , Brett McFarland ₁ , Ashley Ryan ₁

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In this study, we captured how a river channel responds to a sediment pulse originating from a dam removal using multiple lines of evidence derived from streamflow gages along the Patapsco River, Maryland, USA. Gages captured characteristics of the sediment pulse, including travel times of its leading edge (~7.8 km yr⁻¹) and peak (~2.6 km yr⁻¹) and suggest both translation and increasing dispersion. The pulse also changed local hydraulics and energy conditions, increasing flow velocities and Froude number, due to bed fining, homogenization and/or slope adjustment. Immediately downstream of the dam, recovery to pre-pulse conditions occurred within the year, but farther downstream recovery was slower, with the tail of the sediment pulse working through the lower river by the end of the study 7 years later.

中文翻译：

使用常规量具数据对在高分辨率下捕获的除水泥沙脉冲的通道响应

在这项研究中，我们使用了沿美国马里兰州帕塔普斯科河的水流计得出的多条证据，捕获了一条河道对源自拆除大坝的泥沙脉动的响应。计捕获沉积物脉冲的特性，包括其前缘的传播时间（〜7.8公里年^-1）和峰（〜2.6公里年^-1），并建议翻译和增加分散度。由于床层细化，均质化和/或斜率调节，该脉冲还改变了局部水力和能量条件，增加了流速和弗洛德数。大坝下游立即在一年内恢复到脉冲前状态，但下游下游恢复较慢，到7年后研究结束时，沉积物脉冲的尾部流经下游河道。

更新日期：2021-01-28

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