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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Tracing sediment redistribution across a break in slope using rare earth elements
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Tracing sediment redistribution across a break in slope using rare earth elements

机译：使用稀土元素追踪坡度折断处的沉积物再分配

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摘要

Experimentally determined spatial patterns of soil redistribution across a break in slope derived using 10 rare earth element (REE) oxides as sediment tracers are presented. An erosion experiment was conducted using simulated rainfall within a laboratory slope model measuring 2·5 m wide by 6 m long with a gradient of 15° declining to 2°. Soil was tagged with multiple REE and placed in different locations over the slope and at the end of the experiment REE concentrations were measured in samples collected spatially. A new method was developed to quantify the erosion and deposition depths spatially, the relative source contributions to deposited sediment and the sediment transport distances. Particle-size selectivity over an area of net deposition was also investigated, by combining downslope changes in particle-size distributions with changes in sediment REE composition within a fl ow pathway. During the experiment, the surface morphology evolved through upslope propagation of rill headcuts, which gradually incised the different REE-tagged zones and led to sediment deposition at the break in slope and the development of a fan extending over the shallow slope segment. The spatial patterns in REE concentrations, the derived erosion and deposition depths, the relative source contributions to deposition zones and the sediment transport distances, corroborate the morphological observations and demonstrate the potential of using REE for quantifying sediment transport processes.
机译：提出了通过实验确定的通过10个稀土元素（REE）氧化物作为沉积物示踪剂得出的坡度折断处土壤重新分布的空间格局。使用模拟降雨在实验室坡度模型中进行侵蚀实验，该坡度模型的宽2·5 m x长6 m，坡度从15°下降到2°。用多个REE标记土壤，并将其放置在斜坡上的不同位置，并在实验结束时测量空间收集的样品中的REE浓度。开发了一种新方法来在空间上量化侵蚀和沉积深度，相对源对沉积沉积物的贡献以及沉积物的传输距离。通过结合粒径分布的下坡变化与流路内沉积物REE组成的变化，还研究了净沉积面积上的粒径选择性。在实验过程中，表面形态是通过钻头切屑的上坡传播而演变的，这些坡口逐渐切开了不同的REE标签区域，并导致在坡折处的沉积物沉积，并形成了一个在浅坡段延伸的扇形。稀土元素浓度的空间格局，导出的侵蚀和沉积深度，相对源对沉积区的贡献以及沉积物的传输距离，证实了形态学观察结果，并证明了使用稀土元素定量沉积物传输过程的潜力。

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