| 挟沙水流紊动特征的小波分析研究 |
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| 引用本文： | 林鹏,陈立.挟沙水流紊动特征的小波分析研究[J].水科学进展,2001,12(4):450-454. |
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| 作者姓名： | 林鹏 陈立 |
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| 作者单位： | 武汉大学水利水电学院, 教育部水沙科学重点实验室国家电力公司工程泥沙重点实验室, 湖北, 武汉, 430072 |
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| 基金项目： | 国家自然科学基金(50079018);教育部霍英东青年教师基金(71070);教育部高校骨干教师资助计划项目资助 |
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| 摘 要： | 采用三阶Db3小波函数对挟沙水流脉动流速进行消噪,小波分析较好的时频特性能有效地消除原始信号的高频噪声。将消噪后的脉动流速用不同尺度的小波进行分解,较大尺度下的小波分解刻划信号的总体趋势和形状,体现湍流的相干结构;而较小尺度下的分解则反映信号变化较快的高频部分,反映湍流的小尺度旋涡的各向同性的无序紊动特性。
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| 关 键 词： | 小波分解 挟沙水流 脉动流速 消噪 |
| 文章编号： | 1001-6791(2001)04-0450-05 |
| 收稿时间： | 2000-09-18 |
| 修稿时间： | 2000年9月18日 |
Application of the Wavelet to Study on the Turbulence Structure of Sediment-Laden Flow |
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| LIN Peng,CHEN Li.Application of the Wavelet to Study on the Turbulence Structure of Sediment-Laden Flow[J].Advances in Water Science,2001,12(4):450-454. |
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| Authors: | LIN Peng CHEN Li |
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| Institution: | College of Water Conservancy and Hydropower Engineering of Wuhan University, Wuhan 430072, China |
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| Abstract: | In this paper the Db3 wavelet transform is applied to study instantaneous velocity of sedimentladen flow measured by the MicroADV, and according to the characterize of local property of the wavelet in time frequency, the high frequency noise is easily removed.The de-noised velocity is further analyzed as the higher frequency and the lower frequency part, the lower scale represents the regularity of velocity fluctuation on the whole and relates to coherence of turbulent, and the higher scale represents the fine structure of velocity fluctuation, which relates to the isotropic characteristic of turbulence. |
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| Keywords: | wavelets transform sediment-laden flow fluctuation velocity de-noised |
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