Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors

YANG Wei; CUI Peng; ZHUANG Jian-qi; ZHANG Jian-qiang

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Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors

- Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors
- Bulletin of Soiland Water Conservation Vol. 31, Issue 2, Pages: 80-83(2012)
- 作者机构：
  
  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
  2. 中国科学院研究生院,北京,100049
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- Published：2012
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YANG Wei, CUI Peng, ZHUANG Jian-qi, et al. Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors[J]. Bulletin of Soiland Water Conservation, 2012, 31(2): 80-83.
DOI：

YANG Wei, CUI Peng, ZHUANG Jian-qi, et al. Particle-size's Fractal Characteristics of Debris-flow Deposits and Associated Influencing Factors[J]. Bulletin of Soiland Water Conservation, 2012, 31(2): 80-83. DOI：

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。

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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