规则波致剪切波的时空变化

发布时间：2018-03-21 19:42

  本文选题：剪切波时空变化　切入点：规则波　出处：《河海大学学报(自然科学版)》2016年01期 　论文类型：期刊论文

【摘要】：基于物理模型试验、小波变换理论及剪切不稳定理论等,研究入射波为规则波、地形为平直斜坡情况下的剪切波时空变化特性。通过对15个不同波况下的剪切波流速时间历程的小波谱进行分析,得出如下结论:入射波为规则波、地形为平直斜坡情况下可以观测到剪切波,但是时空变化不明显;剪切波产生后随时间的变化呈现连续性;剪切波在沿岸方向的能量谱中比在垂直岸线方向能量谱中占优势;地形坡度增加会使剪切波产生的区域减小;无论是1∶40坡还是1∶100坡,由剪切不稳定引起的剪切波频率都在约0.015 Hz左右变化。
[Abstract]:The physical model test based on wavelet transform theory and the theory of shear instability, incident wave wave, the terrain is temporal and spatial variation characteristics of shear wave slope straight condition. Through the analysis of 15 different spectral shear wave condition of the wave velocity time history, and the following conclusion: the incident wave is regular wave, the terrain is flat slope under the condition of shear wave can be observed, but the temporal variation is not obvious; showed a continuous variation with time after shear wave; shear wave energy spectrum in the alongshore direction than in the direction perpendicular to the coastline in the dominant energy spectrum; the terrain slope will increase shear wave region decreases; whether 1 or 1: 100: 40 slope slope, shear wave frequency by shear instability caused by changes in about 0.015 Hz.

【作者单位】： 太原理工大学水利科学与工程学院;天津大学水利工程安全与仿真国家重点试验室;
【基金】：中国博士后面上基金(2013M541179) 水利工程仿真与安全国家重点实验室开放基金(HESS-1406)
【分类号】：P731.2
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本文编号：1645272