径流冲刷条件下冻融坡面产沙时空分布

发布时间：2018-06-09 05:36

本文选题：冻融坡面 + 初始解冻深度　；参考：《水土保持学报》2017年05期

【摘要】：为确定冲刷条件下冻融坡面侵蚀产沙时空分布特征,利用稀土元素(REE)示踪技术,采用2个坡度(10°,15°),4个初始解冻深度(2,5,10,15cm),4个流量(4.5,6.5,8.5,10.5L/min)进行径流小区冲刷试验,分析冻融坡面侵蚀产沙时空变化规律。结果表明:相同初始解冻深度条件下土壤侵蚀产沙量随着坡度和流量的增大而增大,坡面第1坡段发生侵蚀最大,占总产沙量的68.24%,第3坡段产沙量一直趋于平稳状态;坡度相同时,侵蚀产沙量随着起始解冻深度和流量的增大而增大;冻融坡面侵蚀产沙量沿坡面方向和沿土壤深度方向逐渐降低;La元素示踪区产沙量随时间变化呈先增大后减小的趋势,其他各稀土元素示踪区产沙量随侵蚀时间变化的趋势与La元素示踪区产沙量的变化趋势基本一致。
[Abstract]:In order to determine the spatial and temporal distribution of erosion and sediment yield on frozen and thawed slope under scour conditions, the runoff plot erosion test was carried out by using rare earth element REE tracer technique, using two slopes of 10 掳~ 15 掳, four initial thawing depths of 2 掳~ 5 ~ 5 ~ 10 ~ (15) cm ~ (-1) and four flow rates of 4.5 ~ 6.5 ~ 8.5 ~ 10.5 L / min). The temporal and spatial variation of erosion and sediment yield on freeze-thaw slope is analyzed. The results show that under the same initial thawing depth, the sediment yield of soil erosion increases with the increase of slope gradient and flow rate, and the erosion occurs in the first slope of the slope, accounting for 68.24% of the total sediment yield, and the sediment yield in the third slope tends to be stable. When the slope is the same, the sediment yield increases with the increase of the initial thawing depth and discharge. The sediment yield of frozen and thawed slope gradually decreased along the slope direction and along the direction of soil depth. The sediment yield in the tracing area of La element increased first and then decreased with time. The variation trend of sediment yield with erosion time in other rare earth element tracer areas is basically consistent with that in La tracer area.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家自然科学基金项目(41471225) 辽宁省农业领域青年科技创新人才培养计划(2014054)
【分类号】：S157.1

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