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在木质径流小区布设人工磁性示踪剂,利用模拟降雨和自然降雨研究了连续降雨条件下的鲁中山区小流域坡面侵蚀形态的演变以及径流小区侵蚀泥沙量与坡面磁化率变化值的相关性。结果表明,坡面侵蚀方式以溅蚀、面蚀和细沟侵蚀为主。坡面顶部以溅蚀为主,为净侵蚀区;细沟侵蚀在坡面中下部最先发育,试验结束时细沟侵蚀部位已上溯至坡面中上部;坡脚处为侵蚀、沉积的交汇处。坡面的侵蚀程度以细沟发生部位最严重,坡面顶部其次,坡脚处最轻。在模拟降雨和自然降雨条件下,侵蚀泥沙量与坡面磁化率降幅完全吻合,呈极显著性相关,R2分别为0.851 4和0.832 0。因此,磁性示踪法可以准确的监测坡面的侵蚀沉积状况。
The artificial magnetic tracers were laid in the wood runoff area. The evolution of the slope erosion patterns in the small watershed in the Luzhongshan area under continuous rainfall and the changes of the sediment yield and the susceptibility of the slope surface to the slope were studied by simulated rainfall and natural rainfall Correlation. The results show that the slope erosion is dominated by splashing, surface erosion and rill erosion. The top of the slope is dominated by splashing and is the net erosion zone. Rill erosion first develops in the middle and lower part of the slope, and the erosion site of the rill has been traced back to middle and upper part of the slope at the end of the experiment. The intersection of erosion and sedimentation at the foot of slope Department. Slope erosion to the most serious part of the occurrence of the rill, followed by the top of the slope, the lightest at the foot of the slope. Under the condition of simulated rainfall and natural rainfall, the amount of sediment erosion is in good agreement with the decline of magnetic susceptibility on the slope, with a significant correlation (R2 = 0.851 4 and 0.832 0 respectively). Therefore, magnetic tracing method can accurately monitor erosion and sedimentation conditions.