Keywords: 
• rainfall characteristics /
• total amount of debris flow /
• principal component analysis /
• correlation analysis /
• data fitting analysis

Abstract: This paper mainly discusses the relationship between total amount of debris flow and rainfall based on the observation data of 30 debris flow events in Jiangjiagou Ravine，obtained by State Field Observation and Research Station of Debris Flow in Dongchuan，Yunnan Province southwestern China. Considering the impact of rainfall on debris flow，the rainfall was classified into indirect antecedent rainfall，direct antecedent rainfall，1 h antecedent rainfall and process rainfall，and then the relationship between rainfall characteristics and total amount of debris flow was researched by correlation analysis，principal component analysis and data fitting analysis using the data of 30 debris flow events and their corresponding rainfall. The results showed that process rainfall and indirect antecedent rainfall had more contribution to total amount of debris flow， and 1 h antecedent rainfall was inferior to them. Both process rainfall and rainfall integrated score had close correlations with total amount of debris flow， and the coefficients were 0.854 and 0.828，respectively. The correlation coefficients of indirect antecedent rainfall，1 h antecedent rainfall and direct antecedent rainfall were lower，which were only 0.414，0.360 and -0.013，respectively. Moreover，the higher the process rainfall and rainfall integrated score were，the greater the total amount of debris flow was. When process rainfall and rainfall integrated score were less than 15 mm and 0.1，total amount of debris flow increased slowly. While when they were more than 15 mm and 0.1， the total amount of debris flow increased quickly with exponential trend. It is concluded that rainfall characteristics should be considered in calculating total amount of debris flow，which is redounded to establish scientific mathematic model of total amount of debris flow. 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