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2015年6月28日,四川巴中南江县暴发了群发性沟床起动型泥石流,给当地居民的生产和生活造成了巨大的影响。此次群发性泥石流的发生范围较小,水文和地质条件较接近,由此可以认为地形条件是诱发此次群发性泥石流的主要因素。因此,从泥石流的形成机理出发,选取形成区的流域面积、沟长、形状系数和沟床纵比降等主要参数作为地形因子的基本参数,通过统计对比建立起花岗岩、石灰岩为主地区诱发泥石流的综合地形因子D,D=0.8(A/A′)2+0.218A/A′+1.65(A/L~2)2-0.8A/L~2+J,且D值越大越容易诱发泥石流,反之则不容易。
On June 28, 2015, a massive gully-start debris flow broke out in Nanjiang County, Bazhong, Sichuan Province, causing tremendous impact on the production and livelihood of local residents. This cluster of debris flow occurred in a smaller range, hydrological and geological conditions are closer, which can be considered topographic conditions is the main factor inducing this mass debris flow. Therefore, taking the formation mechanism of debris flow as the basic parameter of topographic factors, the main parameters of basin area, furrow length, shape factor and vertical ratio of furrow are selected. Through statistical comparison, granite and limestone are established to induce debris flow The comprehensive terrain factor D = 0.8 (A / A ’) 2 + 0.218A / A’ + 1.65 (A / L ~ 2) 2-0.8A / L ~ 2 + J. , The opposite is not easy.