浅层滑坡诱发沟谷泥石流的地形和降雨条件

发布时间：2018-06-03 22:45

本文选题：地形因子 + 降雨因子　；参考：《水科学进展》2016年04期

【摘要】：2011年贵州省望谟县打易镇的大范围浅层滑坡诱发的沟谷泥石流提供了研究这类泥石流地形和降雨条件的机会。在地质条件一致和小区域内的降雨条件基本一致的情况下,地形条件就是这些泥石流暴发与否的唯一决定因素。对比一些重要的地形因素与泥石流暴发的关系,得出了由流域面积、沟床纵比降和25°~45°山坡坡度面积比组成的泥石流综合地形因子T。在地形因子T的基础上,研究获得了由前期降雨量、1 h降雨强度、年平均降雨量等组成的降雨因子R。由地形因子T和降雨因子R获得的临界条件P可以判断该区域的泥石流暴发。由于研究工作部分基于泥石流的形成机理,研究成果还可用于其他区域的泥石流形成预测,为泥石流的预测预报提供了一个较好的方法。
[Abstract]:In 2011, the gully debris flow induced by large scale shallow landslides in Dayi Town, Wangmo County, Guizhou Province, provided an opportunity to study the topography and rainfall conditions of such debris flows. When the geological conditions are consistent with the rainfall conditions in a small area, the topographic conditions are the only determinants of these debris flows. By comparing some important topographic factors and the relationship between debris flow and debris flow, a comprehensive terrain factor of debris flow is obtained, which is composed of basin area, longitudinal ratio of trench bed and slope area ratio of 25 掳to 45 掳slope. Based on the topographic factor T, a rainfall factor R _ (1) is obtained, which is composed of the rainfall intensity of 1 hour and the annual average rainfall. The critical condition P obtained from topographic factor T and rainfall factor R can be used to judge the debris flow in this area. Because the research work is based partly on the formation mechanism of debris flow, the research results can also be used to predict the formation of debris flow in other areas, which provides a better method for the prediction of debris flow.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;四川地矿局915地质队;
【基金】：国家自然科学基金资助项目(41372366)~~
【分类号】：P642.2

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