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通过土槽放水冲刷试验并结合稀土元素(REE)示踪技术,采用沿坡面分层分段布设方式,基于坡面不同部位产沙贡献率的动态变化规律,探讨细沟侵蚀的演变过程。结果表明:在放水冲刷条件下,细沟侵蚀发生的部位集中在坡上段2m,先在距离缓流段末端0~50cm处的表层和中层发育,次之是距缓流段末端50~100cm的表层,之后是距缓流段末端0~100cm的底层,最后在距缓流段末端100~200cm的表层发育。细沟侵蚀在水平方向的发展速度大于在垂向的速度,水平方向的速度是垂向的6倍。
Based on the soil erosion scouring test combined with the REE tracing technique, the stratified and subdivided layout along the slope was used to study the evolution of rill erosion based on the dynamic variation of the contribution rate of sediment yield in different parts of the slope. The results show that under the condition of water scouring and erosion, the rill erosion sites are concentrated in the upper 2 m of the slope, first in the surface layer and middle layer at 0-50 cm away from the end of the slow flow segment, and secondly from 50-100 cm The surface layer is followed by a bottom layer of 0-100 cm from the end of the slow flow section and finally to a surface layer of 100-200 cm from the end of the slow flow section. The development of rill erosion in the horizontal direction is faster than in the vertical direction, and the horizontal velocity is six times vertical.