Quantifying the Sediment Transport Capacity in Eroding Rills Using a REE Tracing Method
Quantifying the Sediment Transport Capacity in Eroding Rills Using a REE Tracing Method
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使用稀土追踪方法量化侵蚀细沟中的泥沙输送能力
DOI：
10.1002/ldr.2535
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发表时间：
2017-02
影响因子：
4.7
通讯作者：
Huang Xinjun
中科院分区：
文献类型：
--
作者：
Zhang Qingwen;Lei Tingwu;Huang Xinjun
量化沉积物输送能力对于更好地了解水蚀过程至关重要。量化土壤侵蚀过程的限制是由于缺乏空间分布的沉积物数据。稀土元素（REE）是一组具有独特性质的元素，具有与土壤颗粒牢固结合且不干扰沉积物分离和运输过程的特性，可用于土壤沉积物输送能力的潜在研究。本研究的目的是使用 REE 示踪方法估算侵蚀细沟中的泥沙输送能力。十种稀土氧化物（Ho2O3、Tb4O7、Eu2O3、Yb2O3、Dy2O3、Sm2O3、La2O3、Tm2O3、CeO2 和 Nd2O3）用作与土壤混合的示踪剂。进行了结合五个坡度和四种流量的水槽实验。实验中三个较陡坡的水流量取为2、4和8 L min−1 (L min−1)，两个缓坡的流量为4、8和12 L min−1。水流被泵送到棕褐色并引入长8米、宽0·1米的水槽的入口，水槽被分成十个相等的部分，每个部分含有带片的稀土元素-土壤混合物。根据侵蚀物质中的稀土元素浓度及其背景参考值计算沿不同长度小溪的沉积物负荷。随着沉积物负荷与沿侵蚀小溪的下坡距离之间的指数上升到最大方程，我们开发了一种量化沉积物输送能力的方法。 REE示踪方法获得的结果证实，输沙能力随着流量和坡度呈幂函数增加，确定系数(R2)为0·93(p < 0·001)。输沙能力对流量的影响较大，对坡度的影响较小，流量指数越大。本研究结果表明，REE方法有助于估算坡耕地集中流输沙能力，提高对水蚀过程的认识。然而，应在复杂景观和自然降雨下的现场规模上进一步研究使用稀土元素来量化沉积物迁移的可行性。版权所有 © 2016 约翰·威利父子有限公司
Quantifying the sediment transport capacity is crucial for better understanding of water erosion process. The limit for quantifying soil erosion process is due to a lack of spatially distributed sediment data. The rare earth elements (REEs) are a group of elements with unique properties for the potential study of soil sediment transport capacity, due to its characteristics as being strongly bound to soil particles and not interfere with sediment detachment, and transportation processes. The objective of this study was to estimate the sediment transport capacity in eroding rills using the REE tracing method. Ten REE oxides (Ho2O3, Tb4O7, Eu2O3, Yb2O3, Dy2O3, Sm2O3, La2O3, Tm2O3, CeO2, and Nd2O3) were used as tracers mixed with soil. A flume experiment combined with five slopes and four flow rates was conducted. Water flow rates of 2, 4, and 8 L min−1 (L min−1) were taken for the three steeper slopes in the experiment, and flow rates of 4, 8, and 12 L min−1 were taken for the two gentle slopes. Water flow was pumped to a tan and introduced to the inlet of a flume with 8‐m long and 0·1‐m wide, which were divided into ten equal segments, with each segment containing a tabbed REE‐soil mixture. The sediment load along different length rills was calculated from the REE concentrations in the eroded material and its background reference value. With an exponential rise to maximum equation between sediment loads with the downslope distance along eroding rills, we developed a method to quantify the sediment transport capacity. The results obtained by the REE tracing method confirmed that sediment transport capacity increased as a power function with flow rate and slope gradient, with a determination of coefficient (R2) of 0·93 (p < 0·001). Sediment transport capacity was more dependent on the flow rate and less on the slope gradient with larger exponent for the flow rate. The results from this study showed that the REE method is helpful to estimate the sediment transport capacity in a concentrated flow on the sloping cropland, and to improve understanding the processes of water erosion. However, the feasibility of using the REE for quantifying sediment transport should be further investigated at the field scale on complex landscapes and under natural rainfall. Copyright © 2016 John Wiley & Sons, Ltd.
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影响因子：
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