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泥石流作为渔子溪流域的一种重要地貌地质演变过程,研究该流域内泥石流沟谷地貌及演变过程对渔子溪流域的S303线灾后恢复重建工作提供科学的依据。通过对流域内的29条沟谷型泥石流各自的地貌形态特征统计分析,渔子溪流域内泥石流的发育分布在空间上呈明显的分形特征,泥石流沟发育数量与流域面积、主沟长度、主沟纵比降、流域相对高差以及流域形态系数存在明显的分形现象,分维值分别为0.577、0.92、1.192、1.412、0.978,具有较多的自相似性。研究结果表明:区域内泥石流沟谷形态演变的非线性特征主要为对区域内强烈地质构造活动响应的直接结果,主要体现为构造活动下地壳的迅速抬升沟谷的强烈下切。其研究成果可为该流域泥石流发生机理、防灾减灾工作提供理论依据。
The debris flow, as one of the important geomorphologic evolutions in the Yuzixi River Basin, provides a scientific basis for the post-disaster restoration and reconstruction of the S303 line in the Yuzixi River Basin. Through the statistical analysis of the morphological characteristics of 29 valley debris flows in the basin, the development and distribution of debris flow in the Yuzixi Valley shows obvious fractal characteristics. The number of development of debris flow ditch and the area of the drainage basin, the length of main channel, The relative elevation, the relative height difference of the catchment and the form factor of the drainage area have obvious fractal phenomena. The fractal dimension values are 0.577, 0.92, 1.192, 1.412 and 0.978, respectively, which have more self-similarities. The results show that the nonlinear characteristic of debris flow valley evolution in the region is mainly the direct result of the strong geological tectonic activity in the region, which is mainly reflected by the intense undercutting of rapidly rising valleys under the tectonic activity. The research results can provide a theoretical basis for the occurrence mechanism of debris flow and the work of disaster prevention and reduction in this basin.