冲淤变动型沟谷泥石流形成条件研究

冲淤变动型沟谷泥石流是我国西部公路沿线致灾最强烈的泥石流类型,通常表现为对公路构建筑物的冲击和淤埋毁损.笔者从地貌条件、物源及动力条件3方面出发对该类泥石流的形成条件进行了研究.泥石流沟长宽比小于5 0并且具有较大的形成区、大比降的流通区、宽缓的沉积区是该类泥石流形成的地貌条件;丰富且稳定性差的第四系松散堆积物及工程弃渣是该类泥石流形成的物质条件;前期降雨量和降雨强度的有机结合或较高的日温度是该类泥石流形成的动力条件.研究成果丰富了公路泥石流学的科学内涵.

Research on formation conditions of V-shaped debris flow with impact and deposit

As one type of debris flow along highway to trigger disaster in west China, V-shaped debris flow with impact and deposit usually impact and bury structures of highway. The authors make some studies to formation conditions of the debris flow from geomorphology, material and dynamic features in this paper. It are identified that both formation region with greater area and less than 5.0 of length and width ratio, steeper pass region and gently deposit region are geomorphologic conditions for the debris flow. Lots of unstable natural loose material forming in quaternary and/or engineering discard are material conditions for the debris flow. Constitute of continue precipitation early stage and strength or higher air temperature are dynamic conditions for the debris flow. These results fertile 《Debris Flow in Highway》.