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极震区震后泥石流物源特征研究

DOI: 10.13577/j.jnd.2015.0214, PP. 107-114

Keywords: 极震区,泥石流,物源,放大效应,动储量

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Abstract:

汶川地震后,极震区产生了大量的崩滑堆积体、震裂岩体及震动松弛覆盖层,极震区震后泥石流物源的产生及汇集方式发生了极大的变化,但缺乏震后特殊条件下动储量的计算方法.在实际调查统计"5?12"极震区安县高川乡多条泥石沟物源的基础上,总结了极震区震后泥石流的形成过程及启动方式.分析得出,震后泥石流物源量与沟域面积、高程放大效应、断层运动方式、地质岩性条件及地形条件等因素有关,其中沟域面积、沟顶高程及沟道与发震断裂的距离为主控影响因子.在此基础上,提出了"地震高程指数放大经验模型";通过多元统计拟合法首次得出了震后泥石流动储量与流域面积、高差的计算关系,并通过地震距离修正得出极震区震后泥石流的动储量计算公式,为震后泥石流动储量估算及工程治理提供参考.

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