| 泥石流堆积物粒度分形特征及影响因素分析 |
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| 引用本文： | 杨伟,崔鹏,庄建琦,张建强.泥石流堆积物粒度分形特征及影响因素分析[J].水土保持通报,2012,32(2):80-83. |
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| 作者姓名： | 杨伟 崔鹏 庄建琦 张建强 |
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| 作者单位： | 1. 中国科学院水利部成都山地灾害与环境研究所中国科学院山地灾害与地表过程重点实验室,四川成都610041／中国科学院研究生院,北京100049
2. 中国科学院水利部成都山地灾害与环境研究所中国科学院山地灾害与地表过程重点实验室,四川成都,610041 |
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| 基金项目： | 国家重点基础科学(973)研究发展计划项目“中国西部特大山洪泥石流灾害形成机理与风险分析”(2011CB409902) |
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| 摘 要： | 汶川地震诱发了大量的泥石流,给山区带来了巨大的人员伤亡及财产损失,为了更好地对泥石流特征进行研究并对其危险性进行预测,通过野外取样对泥石流堆积物进行了粒度分析,并对汶川地震灾区泥石流堆积物的分形结构特征以及泥石流物源区岩性、松散物质量及沟道坡降对泥石流堆积物颗粒组成的影响进行了分析。结果表明,其粒度分维值介于2～3之间,平均值为2.49,标准差为0.19,分维值的离散度比较低。粉砂岩的分维值最小,其次是砂岩和泥灰岩;石英闪长岩的分维值最大,其次为石灰岩。分维值的变化趋势与松散物质量的变化趋势极为相似,分维值随着松散物质量的增大而增大。泥石流堆积物的分维还受到沟道坡降的影响,在其它影响因素相同的情况下,分维值随着沟道坡降的增大而增大。地震后泥石流堆积物的分形特征体现了泥石流危险度的大小,可为泥石流活动特征及危险性预测提供依据。
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| 关 键 词： | 泥石流堆积物 分维 岩性 松散物质 |
| 收稿时间： | 2011/5/18 0:00:00 |
| 修稿时间： | 8/1/2011 12:00:00 AM |
Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors |
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| YANG Wei,CUI Peng,ZHUANG Jian-qi and ZHANG Jian-qiang.Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors[J].Bulletin of Soil and Water Conservation,2012,32(2):80-83. |
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| Authors: | YANG Wei CUI Peng ZHUANG Jian-qi and ZHANG Jian-qiang |
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| Institution: | 1,2(1.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences and Ministry of Water Conservancy,Key Laboratory of Mountain Hazards and Land Surface Process,Chinese Academy of Sciences, Chengdu,Sichuan 610041,China;2.Graduated School of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | Numerous debris flows were triggered by the Wenchuan earthquake,bringing a large number of casualties and property loss to the mountain area.For better understanding and prediction of debris flow,particle size analyses were carried out on field samples of debris flow deposits.Fractal structures of debris flow deposits were also analyzed based on fractal theory in the area.The fractal dimension ranged from 2 to 3,with an average of 2.49 and standard deviation of 0.19,showing a low dispersion degree of fractal dimension.The influences of lithology,total volume of loose materials,and slopes on the particle composition of debris flow deposits were studied.The results show that the deposits of siltstone have the minimum fractal dimension value,followed by those of sandstone and marl.In contrast,the deposits of quartz diorite and limestone have the highest and the second highest fractal dimension value.The fractal dimension values of the deposits increases with the total volume of loose materials,as well as the gully slope.The fractal characteristics of the deposit indicate the risk of debris flow,providing evidences for characterization and prediction of debris flow activities. |
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| Keywords: | debris flow deposit fractal dimension lithology loose material |
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