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5·12汶川大地震诱发了崩塌、滑坡、泥石流等次生灾害,崩塌、滑坡堆积物给泥石流的形成提供了大量松散固体物质,将导致灾区部分山洪沟转化为泥石流沟,为此,给出了一种泥石流沟的判识方法和指标。调查发现,汶川灾区的地形地貌和降雨条件满足泥石流的暴发条件,提出用流域单位面积的松散固体物质方量来判识泥石流沟;调查西部山区的50条泥石流沟,提出以0.1m3/m2的松散固体物质量作为泥石流沟的判别指标,以2m3/m2的松散固体物质量作为粘性泥石流沟的判别指标。
5.12 Wenchuan earthquake induced secondary disasters such as landslide, landslide and debris flow, and landslides and landslides provided a large amount of loose solid material for the formation of debris flow, which led to the conversion of some torrents of flood torrents to debris flow ditches. To this end, A method and index of debris flow ditch. The survey found that the topography and rainfall conditions in Wenchuan disaster area meet the outbreak conditions of debris flow, and proposed to use the mass of loose solid material per unit area to identify the debris flow ditch. Fifty debris flow ditches in the western mountainous area were surveyed, and 0.1 m 3 / Loose solid mass as a discriminant index of debris flow ditch, with 2m3 / m2 of loose solid mass as a discriminant indicator of viscous debris flow ditch.