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干沟泥石流是一条典型的下游集中补给型泥石流沟,其物源的启动、流通与堆积在700 m范围内完成。以2005年干沟泥石流过程为例,应用三种计算公式对该沟泥石流的动力学参数进行了计算。通过计算发现,三种公式计算结果差别不大,并取其平均值作为计算结果。根据干沟泥石流流量计算和形态调查对比分析,认为2005年干沟泥石流的形成过程具有明显的堵溃效应,且前期降雨对泥石流的发生影响较为明显。在对干沟泥石流动力学参数计算、物源补给特征及形成过程分析的基础上,认为干沟在2005年后易形成高频泥石流,对该沟泥石流开展监测预警尤为必要,提出了该沟泥石流监测预警方式并予以实施,可为干沟泥石流的防灾减灾提供科学依据。
Dry gully debris flow is a typical downstream recharge recharge type debris flow ditch, the source of its start, circulation and accumulation in the 700 m range completed. Taking the dry gully debris flow in 2005 as an example, the kinetic parameters of the gully debris flow were calculated by using three calculation formulas. The results show that there is not much difference between the three formulas and the average is taken as the calculation result. According to the calculation and morphological survey of the debris flow in dry gully and gully, it is concluded that the formation of dry gully debris flow has obvious blocking effect in 2005, and the influence of previous rainfall on the occurrence of debris flow is obvious. Based on the calculation of the flow dynamics parameters of the Gully debris and the analysis of the source recharging characteristics and forming process, it is considered that the dry gully tends to form high-frequency debris flow after 2005 and is especially necessary for the monitoring and early warning of the debris flow in the gully. Monitoring and early warning methods and implementation, can provide a scientific basis for disaster prevention and mitigation of gully debris flow.