Spectral analysis of irregular waves in wave–mud and wave–current–mud interactions
Spectral analysis of irregular waves in wave–mud and wave–current–mud interactions
复制标题
波-泥浆和波-流-泥浆相互作用中不规则波的频谱分析
DOI：
10.1007/s10236-015-0864-4
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发表时间：
2015
期刊：
影响因子：
2.3
通讯作者：
T. Shibayama
中科院分区：
文献类型：
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作者：
Farzin Samsami;Mohsen Soltanpour;T. Shibayama
通过两个系列的波浪水槽实验室实验，有和没有电流，其中商业高岭石被用作淤泥质沉积物床料的不规则波通过淤泥床的耗散进行了研究。研究了波浪沿泥质床沿着向谱特征的变化以及顺向流和反向流的影响。采用多层数值模型模拟了考虑泥浆粘弹性流变特性的规则波和不规则波的衰减，并与实验结果进行了比较。第一系列的实验表明，在短的流体泥浆段上的波谱的传播不会导致波谱的峰值频率的偏移。不同波谱的谱宽参数的比较也表明，谱峰度参数值越大，波能耗散率越高。这可能与波浪能量耗散对泥层的频率依赖性有关。第二系列实验的结果表明，较高的耗散率在相反的电流和较低的利率在以下电流，这可以归因于由于电流的存在，入射波高的变化。研究证实，波浪在泥面上传播的动压力是规则波/不规则波-流-泥相互作用的控制因素，而流本身对泥层的直接影响很小。
The dissipation of irregular waves passing over muddy beds is investigated through two series of wave flume laboratory experiments with and without currents, where commercial kaolinite is used as the muddy sediment bed material. The changes in spectral characteristics of waves along the muddy bed and the effects of following and opposing currents are investigated. A numerical multi-layered model was also employed to simulate the attenuation of regular/irregular waves assuming viscoelastic rheological behavior for fluid mud, and the outputs were compared with the laboratory data. The first series of the experiments show that propagation of a wave spectrum over a short fluid mud section does not result in a shift in peak frequencies of wave spectra. The comparisons of spectral width parameters of various wave spectra also reveal that higher values of spectral peakedness parameters generally result in higher rates of wave energy dissipation. This can be related to the frequency dependency of wave energy dissipation on the mud layer. The results of the second series of experiments show higher dissipation rates in the opposing current and lower rates in the following current, which can be attributed to the changes in incident wave heights due to existence of currents. The study confirms that the dynamic pressure of wave propagation on the mud surface is the governing factor in regular/irregular wave–current–mud interaction and the current itself has little direct effect on the mud layer.
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