Investigating source areas of eroded sediments transported in concentrated overland flow using rare earth element tracers
Investigating source areas of eroded sediments transported in concentrated overland flow using rare earth element tracers
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DOI：
10.1016/j.catena.2008.01.002
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发表时间：
2008-06
期刊：
影响因子：
6.2
通讯作者：
C. Stevens;J. Quinton
中科院分区：
文献类型：
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作者：
C. Stevens;J. Quinton
稀土元素氧化物（REO）在侵蚀研究中具有很好的示踪作用。利用实验室和现场实验，我们的目的是开发和测试一个简单的应用方法，传播REOs和使用REOs来确定沉积物的来源集中的地表水流路径。农业机械（有轨电车）在田间留下的痕迹作为集中的流动路径，将大量的地表径流和夹带的沉积物输送到田间边界，但对这些沉积物的来源知之甚少。进行了两个现场实验，以调查这一点，一个看是否泥沙夹带从不同的点沿着的长度的电车线和一个看在该地区的泥沙夹带从任何一方的电车线。淋溶试验和降雨模拟的结果清楚地表明，这种方法的潜力，用于跟踪沉积物，有很少的运动REO通过土壤剖面，他们被运送与沉积物在坡面流。在现场试验中，在有轨电车线路中输送的大部分沉积物都是在其两侧的第一米范围内产生的，然而，侵蚀沉积物收集并流入有轨电车线路的总面积可能很大，从4至6米之间侵蚀的少量沉积物被输送到有轨电车线路中。稀土氧化物作为土壤侵蚀的示踪剂具有很好的潜力。它们提供了一种快速和廉价的方法来确定侵蚀沉积物的来源，并有很好的潜力，用于确定侵蚀速率。
Rare earth element oxides (REOs) have excellent potential for use as tracers in erosion studies. Using laboratory and field experiments we aimed to develop and test a simple application method for spreading REOs and to use REOs to determine the source of sediment to concentrated overland flow paths. Tracks left by farm machinery (tramlines) in fields act as concentrated flow paths, delivering a large amount of surface runoff and entrained sediment to the field boundary however little is known regarding where this sediment is sourced from. Two field experiments were conducted to investigate this, one looking at whether sediment is entrained from different points along the length of the tramline and one looking at the area over which sediment is entrained from either side of a tramline. Results from leaching tests and rainfall simulations clearly demonstrated the potential of this method for tracing sediment, there was very little movement of REOs through the soil profile and they were transported with sediment in overland flow. In the field experiment a large proportion of the sediment transported in the tramline originated within the first metre either side of it. However, the total area over which eroded sediment collects and flows into the tramline is potentially large with small amounts of sediment eroded from the between 4 and 6 m being transported in the tramline. REOs have an excellent potential for use as a tracer of soil erosion. They provide a quick and cheap method of identifying sources of eroded sediments and have good potential for use in determining erosion rates.