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泥石流是我国西南山区常见的一种地质灾害。5·12地震构成了众多隐蔽的不稳定斜坡,在强降雨条件下,这些潜在的不稳定斜坡极易形成突发性泥石流。在流域划分的基础上,基于不同尺度将汶川县划分为不同的流域单元,选取评价因子,建立评价模型,最终实现整个汶川县潜在突发性泥石流危险性评价。结果表明:若按集水阈值20万、30万与40万划分流域单元,则潜在突发性泥石流高危险性及以上单元分别有58、59与30个,占流域单元总数的43.61%、67.05%与57.59%。
Debris flow is a common geological disaster in southwest China. The May 12 earthquake constituted a large number of hidden, unstable slopes, which are prone to sudden debris flow under heavy rainfall conditions. Based on the division of watersheds, Wenchuan County is divided into different watershed units based on different scales, evaluation factors are selected, and evaluation models are established to finally realize the potential sudden debris flow hazard assessment in Wenchuan County. The results showed that if the catchment thresholds are 200,000, 300,000 and 400,000, the potential high risk of sudden debris flow and the above units are 58,59 and 30 respectively, accounting for 43.61% and 67.05 of the total catchment units, respectively % And 57.59%.