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以成昆铁路红层地区的3个小流域为研究区,计算3个年份的地面割裂度及其年平均变化率,分析用地面割裂度表征泥石流沟侵蚀程度的不足及其原因。基于泥石流沟发育的物理模型,以原来的地面割裂度定义为基础,引入表述沟谷分布零散程度的异型度因子,导出新侵蚀系数公式。以3个小流域固体物质的年平均流失量作为侵蚀程度强弱的标准,采用非参数统计推断方法,将侵蚀系数、地面割裂度的年变化值和固体物质的年平均流失量作秩统计和次序统计。对秩统计参数和次序统计参数比较结果表明:在表征泥石流沟侵蚀程度方面,侵蚀系数优于地面割裂度。
Taking the three small watersheds in the red layer of Cheng-Kun Railway as the research area, the ground-based degree of division and its annual average rate of change in three years were calculated. Based on the physical model of the development of debris flow ditch, based on the original definition of the ground clearance, a new type of erosion coefficient formula was derived by introducing the heterogeneity factor that describes the degree of dispersion of the valley distribution. Taking the average annual loss of solid matter in the three watersheds as the criterion of the degree of erosion, the non-parametric statistical inference method was used to make the annual variation of erosion coefficient and ground cutoff and the annual average loss of solid matter as Order statistics. The results of comparing the statistic parameters of the rank and the order statistics show that the erosion coefficient is better than the ground cut in characterizing the degree of erosion in the debris flow gully.