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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Tracking sediment redistribution in a small watershed: Implications for agro-landscape evolution
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Tracking sediment redistribution in a small watershed: Implications for agro-landscape evolution

机译：跟踪小流域的沉积物再分配：对农业景观演变的启示

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A new, multi-tracer method is used to track erosion, translocation, and redeposition of sediment in a small watershed, thus allowing for the first time a complete, spatially distributed, sediment balance to be made as a function of landscape position. A 0(.)68 ha watershed near Coshocton, Ohio, USA was divided into six morphological units, each tagged with one of six rare earth element oxides. Sediment translocation was evaluated by collecting run-off and by spatially sampling the soil surface. Average measured erosion rate was 6(.)1 t ha(-1), but varied between 40.4 t ha(-1) loss from the lower channels to 24.1 t ha(-1) gain on the toeslope. With this technique it was possible for the first time to itemize the sediment budget for landscape elements into three components: (1) the soil from the element that left the watershed with run-off; (2) soil from the element that was redeposited on lower positions, with the spatial distribution of that deposition; and (3) soil originating from the upper positions and deposited on the element, with quantification of relative source areas. The results are incongruous with the current morphology of the watershed, suggesting that diffusion-type erosion must also play a major role in defining the evolution of this landscape. Copyright (C) 2004 John Wiley Sons, Ltd.
机译：一种新的，多示踪剂的方法用于跟踪小流域中的沉积物的侵蚀，迁移和重新沉积，从而首次实现了根据景观位置实现完整的，空间分布的沉积物平衡。美国俄亥俄州科肖克顿附近一个0（。）68公顷的流域被分成六个形态单元，每个形态单元都标记有六个稀土元素氧化物之一。通过收集径流和对土壤表面进行空间采样来评估沉积物的迁移。平均测得的侵蚀速率为6（。）1 t ha（-1），但在下部通道的40.4 t ha（-1）损失与趾坡上的24.1 t ha（-1）损失之间变化。借助这种技术，首次有可能将景观要素的沉积物预算细化为三个组成部分：（1）来自流域的流失要素的土壤; （2）来自沉积在较低位置的元素的土壤，具有该沉积的空间分布; （3）来自上部位置并沉积在元素上的土壤，并量化了相对的源区。结果与流域的当前形态不一致，表明扩散型侵蚀也必须在定义该景观的演变中起主要作用。版权所有（C）2004 John Wiley Sons，Ltd.

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