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2013年7月4日18时许,石棉县后沟、熊家沟、马颈子沟3沟同时发生了泥石流。以石棉县2013-07-04群发泥石流为研究对象,通过调查测绘、遥感解译,研究了沟床侵蚀主导型泥石流的形成机理和成灾特征。调查研究表明:小时雨强36.6 mm的暴雨激发了这次群发泥石流,该短历时强降雨可视为是触发这次群发泥石流关键因素;沟床质侵蚀与起动是泥石流最重要的物源,3条沟内约97×104m3沟床堆积物被侵蚀补给泥石流,这次群发泥石流流体粘度高,搬运能力强,下游峰值流量分别达到751.0 m3/s,870.1 m3/s和758.7 m3/s。研究结果对沟床侵蚀主导型泥石流的形成机理和成灾特征的认识及防灾减灾实践具有一定的参考价值。
July 4, 2013 18 o’clock, after the Shimian Hougou, Xiongjiagou, Maijizigou 3 ditch at the same time a debris flow. Taking the debris flow in Shimian County as an example, the formation mechanism and disaster characteristics of the ditch bed erosion-dominated debris flow were studied through surveying, mapping and remote sensing interpretation. The investigation shows that the rainstorm with 36.6 mm of rain intensity triggered the massive mudslides, which can be regarded as the key factor to trigger the massive mudslides. The erosion and start of the channel are the most important source of debris flow.3 The ditches of about 97 × 104m3 ditches are eroded and supplied to the debris flow. The high viscosity and strong handling capacity of the debris flow in this group of debris flow reached 751.0 m3 / s, 870.1 m3 / s and 758.7 m3 / s, respectively. The results of this study have certain reference value for the understanding of formation mechanism and disaster characteristics of ditch-bed erosion-dominant debris flow and practice of disaster prevention and mitigation.