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通过室内模拟试验,将REE示踪法引入小流域泥沙来源研究。试验结果表明:小流域侵蚀产沙的主要源区随流域沟道的侵蚀发育在不断变化。在流域发育的初始阶段,沟道的下切侵蚀是1种主要的侵蚀方式。随小流域沟道的发育,呈现出沟道侵蚀强度逐渐减少,坡面侵蚀强度逐渐增大的总趋势;在次降雨中,也表现出坡沟侵蚀关系的类似变化过程。室内模拟试验结果表明REE示踪法可比较满意地说明小流域泥沙来塬情况,是1种研究小流域泥沙来源的有效方法;同时室内模拟试验还为REE示踪法在野外工作的开展提供了方法准备。
Through indoor simulation test, REE tracer method was introduced into sediment source of small watershed. The experimental results show that the main source area of sediment yield and erosion in small watershed varies with the erosion of channel. In the initial stage of watershed development, undercut erosion of the channels is one of the major forms of erosion. With the development of the small watershed, the total erosion intensity gradually decreases and the soil erosion strength gradually increases. In the sub-rainfall, similar changes are also found in the relationship between erosion and slope erosion. The indoor simulation results show that the REE tracer method can be used to explain the situation of sediment in the watershed of small watershed, which is an effective method to study the source of sediment in the small watershed. Simultaneously, the indoor simulation test is also carried out in the field of REE tracing method Provided a way to prepare.