四川省石棉县马颈子沟泥石流成灾机理与特征研究

在了解马颈子沟泥石流孕灾环境地质背景的基础上，查明了沟域内物源分布及其稳定性，分析了泥石流的发育特征及成灾机理。结果表明:马颈子沟泥石流物源丰富，主沟纵坡大且地形易于汇水，易发泥石流。通过对堵河计算表明，马颈子沟在发生频率P=5%以上的泥石流时，就会挤占、堵塞南桠河。

Study on Disaster Mechanism and Characteristics of Debris Flow of Majingzi Gully in Shimian County of Sichuan Province

Based on the hazard inducing environmental geological background of debris flow in Majingzi gully, in this paper, the distribution and stability of the material sources in the gutter domain were found out; the development characteristics and disaster mechanism of the debris flow were analyzed. The result shows that Majingzi gully has rich debris flow sources, large longitudinal slope of main gully and easy for catchment and inducing debris flow. The calculation results of the block river show that if the debris flow of frequency P=5% and above is happened, the Nanya River would be blocked.