| 非均匀沙床面粗糙度的分形特征 |
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| 引用本文： | 王协康,方铎,姚令侃.非均匀沙床面粗糙度的分形特征[J].水利学报,1999,30(7):0070-0075. |
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| 作者姓名： | 王协康 方铎 姚令侃 |
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| 作者单位： | 1. 四川大学高速水力学国家重点实验室,成都,610065
2. 西南交通大学铁道工程系,成都,610031 |
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| 基金项目： | 国家自然科学基金委员会-水利部联合资助项目，三峡工程泥沙问题研究项目 |
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| 摘 要： | 本文在分析非均匀沙床面颗粒随机分布特性的基础上，对床面颗粒暴露度函数关系进行了分析，通过简化颗粒的排列方式，利用分形理论研究了初始及粗化床面糙度的分形特征，结合实验资料讨论了床面糙率n与糙度分维数D的关系，并与床面糙率n和代表粒径(d50、d90)的关系进行了比较，初步认为对于初始床面分维数与床面糙率具有更好的相关关系，而粗化床面两者代表性基本一致，为更好地研究床面糙率、泥沙起动及其输沙过程提出了一种新的研究方法。
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| 关 键 词： | 床面糙率 粗化床面 分形理论 |
The fractal characteristics of riverbed roughness with non uniform sediment |
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| Wang Xiekang,Fang Duo,Yiao Lingkan.The fractal characteristics of riverbed roughness with non uniform sediment[J].Journal of Hydraulic Engineering,1999,30(7):0070-0075. |
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| Authors: | Wang Xiekang Fang Duo Yiao Lingkan |
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| Affiliation: | 1.Sichuan University; 2.Southwest Jiaotong University |
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| Abstract: | Based on the analysis of stochastic distribution of non uniform sediment, the roughness function of the sediment is studied. The distribution of particles is simplified and the fractal characteristics of roughness with original and armoring riverbed are studied by means of fractal theory. The relationship between riverbed roughness and its fractal dimension is obtained according to the experimental data and compared with the relationship between roughness and representative diameter. It is believed that, the fractal dimension of initial riverbed has a better relationship with the roughness. It provides a new method to study the bed roughness, sediment incipient and transport process. |
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| Keywords: | bed roughness armoring riverbed fractal theory |
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