中文摘要：

侵蚀坑内部边坡的大小决定着侵蚀坑的形态和发展,研究侵蚀坑内部边坡的变化规律可为合理估算冲刷范围提供依据。通过室内水槽实验观测,侵蚀坑纵剖面坑内坡度总体表现为上游坡较下游坡陡,并且随着水槽原始坡度以及沟床组成物质的变化而变化。对于具有相同级配的粘性砂和无粘性砂,粘性砂的侵蚀坑坑内坡度较无粘性砂的要陡。定义侵蚀坑上下游出口与其最深点连线的倾角为侵蚀坑坑内上下游坡度,通过对实验数据进行回归分析,建立了侵蚀坑坑内坡度与泥沙的水下休止角以及沟床原始纵坡之间的定量关系。

英文摘要：

Study on the interior slope of the scour pit below the debris flow sabo dam can provide foundation to estimate the erosion range, the dimension, the shape and the development of the longitudinal profiles. According to the flume experiments, the upper slope in the scour pit is much steeper than the lower, and it changes with the flume angles and composition of silt on the bed. For the same grain composition, the slope in the scour pit with cohesive silt is much steeper than that with non-cohesive silt. Baced on experimental data, the quantitative relationships among the interior slopes, the rest angle of the silt under water and the initial angle of flume were established by regression analysis.