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根据川藏公路培龙沟１９８３～１９８５年的泥石流活动，分析了支沟泥石流的输砂堵江成因，揭 示了堵江现象主要与支干流汇流关系、干流段地貌条件、干流洪水水动力条件、支沟泥石流性质 和泥石流规模有关，并通过各相关因素的分析，提出了支沟泥石流输砂堵江的判别准则。
According to the debris flow activity of the Longchuan Highway from 1983 to 1985, the paper analyzed the causes of the sand blocking and plugging in the tributary debris flow, revealed the confluence relationship between the plugging and the main trunk flow, the geomorphic conditions in the main stream, the hydrodynamic conditions of the main stream flood, The nature of the debris flow in the branch gully is related to the size of the debris flow. According to the analysis of relevant factors, the criterion for determining the sand blocking the muddy debris flow in the branch gully is put forward.