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泥石流活动曾给浙东南山区居民造成重大灾难。结合现场调查,采用工程地质分析和数理统计方法,研究其分布规律。在介绍浙东南山区地质环境背景的基础上,划分其泥石流类型。结果发现,该区域以自然形成、中小规模、低频率和雨源型的稀性崩滑型水石流为主。空间上主要分布在浙南中山区,由南向北数量递增;微地貌上多分布于小流域沟谷的两侧支沟,具有汇水面积小和纵比降大的特点;泥石流最发育的岩组是凝灰质和花岗岩;时间上年际分布不均匀,台风强降雨期集中爆发。
Debris flow activities have caused serious disaster for the residents in southeastern Zhejiang. Combined with field investigation, using engineering geological analysis and mathematical statistics to study its distribution. Based on the introduction of the geo-environmental background in the mountain area of southeastern Zhejiang, the types of debris flow are classified. The results show that the area is dominated by the naturally occurring, small-scale, low-frequency and rain-sourced dilute slump-slip stones. It is mainly distributed in the Zhongshan area of southern Zhejiang Province in space, with an increasing number from south to north. On the micro-topography, the branches are distributed on both sides of the furrows in small watersheds, which have the characteristics of small catchment area and decreasing vertical ratio. Is tuffaceous and granite; uneven distribution of time in the time, strong focus on the outbreak of typhoon outbreak.