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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope
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Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope

机译：土壤侵蚀与沉积物对陡峭岩石坡上运输机制的反应

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A deeper understanding of the sediment characteristics associated with rock fragment content can improve our knowledge of the erosional processes and transport mechanisms of sediments on steep rocky slopes. This research used simulated rainfall experiments lasting for 1 h at a rate of 90 mm h(-1) and employed 5 x 1 x 0.4 m parallel troughs filled with purple soils with different rock fragment volumetric contents (0, 5, 10, 20, 30 and 40%) on a 15 degrees slope gradient. For each simulated event, runoff and sediment were sampled at 1- and 3-min intervals, respectively, to study, in detail, the temporal changes in the size distributions of the eroded sediments. The results show that sediment concentrations, soil erosion rates and soil loss ratios significantly decreased as rock fragment content increased for rock fragment contents from 0 to 40% in purple soils. During the transportation process, clay particles often formed aggregates and were then transported as larger particles. Silt particles were more likely to be transported as primary particles with a low degree of sediment aggregation. Sand-sized particles, which constituted a greater proportion of the original soil than the eroded sediments, were formed from other fine particles and transported as aggregates rather than as primary particles. Suspension-saltation, which mainly transports fine particles of 0.02-0.05 mm and coarse particles larger than 0.5 mm in size, was the most important transport mechanism on steep rocky slopes. The results of this study can help to explain the inherent laws of erosional processes on steep rocky slopes and can provide a foundation for improving physical models of soil erosion. (c) 2019 John Wiley & Sons, Ltd.
机译：更深入地了解与岩石片段内容相关的沉积物特征可以改善我们对沉积岩石斜坡沉积物的侵蚀过程和运输机制的了解。该研究使用模拟降雨实验以90 mm H（-1）的速率持续1小时，并采用5 x 1 x 0.4 m平行槽，填充有不同岩石片段体积的紫色土壤（0,5,10,20， 30和40％）在15摄氏度梯度上。对于每个模拟事件，分别以1-和3分钟的间隔采样径流和沉积物，以详细研究侵蚀沉积物的尺寸分布的时间变化。结果表明，由于岩石片段含量为紫色土壤的岩石片段含量增加，沉积物浓度，土壤侵蚀率和土壤损耗比率显着降低。在运输过程中，粘土颗粒通常形成聚集体，然后作为较大的颗粒转运。淤泥颗粒更可能以低沉积物聚集体作为初级颗粒运输。砂尺寸颗粒，其构成了比侵蚀的沉积物更大比例的原始土壤，由其他细颗粒形成并作为聚集体而不是作为初级颗粒。悬浮盐，主要传输0.02-0.05mm的细颗粒和大于0.5mm的粗颗粒，是陡峭的岩石斜坡上最重要的运输机制。本研究的结果有助于解释陡峭岩石斜坡上的侵蚀过程的固有规律，并可以改善土壤侵蚀物理模型提供基础。 （c）2019 John Wiley＆Sons，Ltd。

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