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西藏东南地区地质灾害频发,历史上曾多次发生过泥石流阻塞河流形成堰塞湖的灾害事件。但是对西藏东南地区堰塞湖的研究多针对长时间大尺度的古堰塞湖的研究,而对短时间高分辨率的泥石流堰塞湖演化规律的研究尚显不足。古乡沟是帕隆藏布江的一条支流,泥石流规模大,爆发频率高,曾两次阻断帕隆藏布江。通过对古乡堰塞湖段的河床结构测量和沙洲钻孔取样,计算了古乡沟泥石流阻断帕隆藏布江后对泥沙淤积速率和山区河床结构的影响。
There are frequent geological disasters in southeastern Tibet. There have been many disastrous events that mudslides blocked the rivers to form dammed lakes in history. However, researches on dammed lakes in the southeastern Tibet are mostly focused on the study of ancient dammed lakes with long-term and large-scale. However, the research on the evolution of dammed lakes with high-resolution short-term debris flow lags far behind. Guxiang ditch is a tributary of the Palong Zangbo River. Large debris flows and high frequency of outbreaks have blocked the Palong Zangbo River twice. Through the measurement of river bed structure and the sampling of sand hole in the Sandy Lake section of ancient township, the influence of the Guxigou debris flow on the sedimentation rate and the riverbed structure after the blocking of the Palongzangbu River was calculated.