基于人工降雨的天津盘龙谷泥石流起动特征

通过泥石流物理模型试验研究了盘龙谷泥石流的起动特征,探讨了其起动方式、物源补给来源以及降雨条件的影响等.实验结果表明,泥石流起动时形成区堆积物源不会整体滑移,而是在其表面形成冲沟并逐渐扩大直至引发泥石流;前期先降小雨使土体达到完全饱和,然后再降中雨或大雨的情形其危险性最高;冲沟两侧的不稳定岩土体构成泥石流物源的主要补给来源.实验现象与盘龙谷泥石流具有较高的一致性,可以为建立泥石流预警系统及防灾减灾提供一定的参考依据.

Initiation of Debris Flow in Tianjin Panlonggu Based on Artificial Rainfall

A debris flow physical model was established to study the starting-up characteristics， and then the initiation mode， recharge sources of provenance， the influence of rainfall on debris flow were studied. The results shows that the major provenance in debris flow forming area wont slide integrally when the debris flow starts up， but rather forming some gullies on the surface of the forming area， and the gullies develop until the debris flow starts up. It′s more dangerous in the case that the soil is saturated by small rainfall beforehand and then scoured by the moderate or heavy rainfalls. Unstable rock and soil mass on both sides of the gullies become the main recharge sources of provenance. The experimental results are well consistent with the natural Panlonggu debris flow. The research results can provide certain reference for building the early warning system and disaster prevention and reduction for Panlonggu debris flow and other similar debris flows.