2008年汶川8.0级地震发生以来，极震区泥石流爆发频率有增无减且规模越来越大，破坏性越来越强，严重威胁灾区人民生命财产安全。对比采取现场勘查、遥感图像分析、历史资料对比分析等方法，分析了极震区泥石流动力特征受地形、地层、物源等因素的影响，特别是泥石流爆发过程中深侵蚀和溃决对泥石流动力特征的影响。针对四川安县高川乡流域泥石流沟的调查和分析，建立泥石流流量-冲刷模型，分析了常规地区泥石流峰值流量与极震区泥石流峰值流量差别，推导出极震区峰值流量及冲刷深度定量计算公式。通过实例分析，理论与实际具有较好的一致性，对极震区泥石流动力参数计算具有较好适用性和有效性。%Since M8.0 Wenchuan earthquake in 2008,the outbreak frequency of debris flows in the meizos-eismal area is increasing both in number and scale,imperiling life and property safeties of people in the disaster ar-ea seriously.We use field exploration,remote sensing image analysis,historical data analysis and other methods to analyze the influence of debris flow dynamic characteristics affected by terrain,stratum,source,etc in meizoseis-mal area,especially the affection of debris flow in the process of landslide outbreak and erosion.According to the investigation and analysis of the Gaochuan valley debris flow gully,we establish a flow-flushing model to analyze the difference of landslide dynamic parameters in the meizoseismal area and normal region,and deduce the quantitative calculation formula of peak flow and scour depth in meizoseismal area.Through the case analysis,we found the theory has a good consistency with practice,which has a good applicability and effectiveness in calculating dynamic parameters of debris flow in the meizoseismal area.
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