乌东德库区泥石流模糊C均值聚类法初步分类研究

A preliminary study of the classification of debris flows in the Wudongde reservoir region illustrated with the FCM clustering method

我国西南地区泥石流频发、多发,造成巨大的损失,如此数量众多的泥石流沟要逐一调查清楚非常困难。文中提出泥石流的初步分类理念,采用主沟平均比降、流域形态参数、形成区山区坡度、流域切割密度、主沟弯曲系数、植被覆盖率这6个影响因子,采用模糊C均值聚类法(FCM)对乌东德库区的541条泥石流进行了分类研究。为验证分类方法的正确定,对现场的27条泥石流沟进行了现场调查。结果发现,基于FCM得到的泥石流分类与泥石流的危险度或敏感度存在较好的对应关系,可体现泥石流沟的实际发育状态。

Debris flows, causing huge losses in mountain areas, happen frequently in Southeast China. A large amount of debris flow gullies makes it extremely difficult to investigate them one by one. This paper proposes the idea of a preliminary classification of debris flows. Six influencing factors （average gradient of the main channel, basin shape parameters, slope of the formative region, basin cutting density, main channel bending coefficient and vegetation coverage） are selected. With FCM, the classification study is conducted based on 541 debris flows in the W udongde reservoir region. To validate the classification method, 27 debris flows gullies have been investigated in the field. The results show that the debris flow classification based on FCM is consistent with the risk degree or sensitivity of debris flows, which may reflect the actual state of development of the debris flow gullies.