Abstract：Research purposes:Dashuigou is located in Lintong where there is a typical rainstorm debris flows．Based on the measured data，this paper analyzes the watershed features and genesis of Dashuigou debris flow to select the reasonable empirical formuls to determine avalues of its main features．On this basis，a simple and practical hazard assessment model of debris flow is established．The minimum square method for the appied weight of model was used to determine the factor weight to ensure the accuracy of the weights．The establishment of hazard assessment model can provide the basis for predicting the disasters of debris flow and taking the control measures for the disaster．
Research conclusions:The research result indicates that using the maximum relative altitude in drainage area，the scale of potential debris flow，debris flow frequency，drainage area，length of main ditches，the average slope of main ditches，maximum rainfall in 24 hours，population density and length proportion of debris supplement section to assess the debris flow hazard is reasonable and feasible．Dashuigou debris flow was assessed with this model．The result showed the Dashuigou debris flow was of high—hazard and it Was consistent with the real hazards status and activities trend．So the model for debris flow hazard assessment is effective and feasible with certain theoretical and practical significance．
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2010, Vol. 27 
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