组合指纹法研究花岗岩崩岗侵蚀泥沙来源

Research on the Sediment Source of Granite Collapse Erosion by the Composite Fingerprints

崩岗侵蚀产沙是崩岗侵蚀研究的重点。本研究对典型崩岗进行采样、分析,筛选出最佳指纹因子组合,利用组合指纹法对崩岗侵蚀产沙进行研究。结果表明:不同层次崩岗土体的理化性质有显著差异,利用无参检验和多元判别分析筛选出粘粒含量、Fe、K为最佳指纹因子组合(累积判别率大于90%),说明指纹法可用于崩岗侵蚀产沙来源研究。同时利用多元混合模型得出侵蚀产沙中超过50%的泥沙来源于红土层和砂土层,这表明该崩岗还处在发展阶段。

Sediment yield of collapse erosion is the key point in the research of collapse erosion. Through sampling and analysis to the typical collapse mounds, it has selected the best fingerprints composition. The research was conducted to the sediment yield of the collapse erosion by using the composite fingerprints. The result shows that the physicochemical properties of the collapse soil have obvious differences at different layers. By using the parameterless examination and multiple discriminate analysis, it is selected the clay content, Fe and K as the best fingerprint factors composition （ accumulated discriminate rate is higher than 90% ）. It means that the fingerprints can be used for the research of the sediment yield of the collapse erosion. Meanwhile, through the multiple - mixed model, it is concluded that more than 50% sediment of the eroded sediment yield is from the red soil layer and sand layer, which means that the collapse is still under the developing stage.