| 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 |
| 非均匀沙床面粗糙度的分形特征 |
| The fractal characteristics of riverbed roughness with non uniform sediment |
| |
| DOI： |
| 中文关键词: 床面糙率 粗化床面 分形理论 |
| 英文关键词: bed roughness armoring riverbed fractal theory |
| 基金项目: |
|
| 摘要点击次数: 2038 |
| 全文下载次数: 90 |
| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |