The experimental study on infra-gravity wave

被引:9
作者
Hwung, Hwung-Hweng [1 ]
Lin, Yu-Hsien
Hsiao, Shih-Chun
机构
[1] Natl Cheng Kung Univ, Dept Hydraul & Ocean Engn, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Res Ctr Ocean Environm & Technol, Tainan 70101, Taiwan
关键词
infra-gravity wave; sideband instability; frequency downshift;
D O I
10.1016/j.oceaneng.2006.08.012
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
A series of experiments were conducted in a super-wave flume (300 m x 5 m x 5.2 m) to examine the low-frequency motion induced by waves with different incident steepness, sloping gradients and normalized frequency (sideband space). Two kinds of waves including initial uniform wave train and modulated wave train (one carrier with a pair of sidebands) are utilized for incident wave conditions. From the experimental results, it is found that for a given slope gradient the infra-gravity wave component decreases as wave nonlinearity increases and frequency downshift is a predominant factor. Furthermore, the magnitude of low-frequency component decreases with slope gradients for a given initial wave condition. In addition, the maximum value of low-frequency motion is found to be close to the normalized frequency, 8 = 1.0. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1481 / 1495
页数:15
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