Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles
Depression and elevation internal solitary waves in a two-layer fluid and their forces on cylindrical piles
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两层流体中的凹陷和高程内孤立波及其对圆柱桩的作用力
DOI：
10.1007/s00343-012-1188-6
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发表时间：
2012-07
影响因子：
--
通讯作者：
Qi Jifen
中科院分区：
文献类型：
--
作者：
Xu Zhenhua;Yin Baoshu;Yang Hongwei;Qi Jifen
在文昌内波实验中，在南海西北部大陆架观测到了大振幅的低洼和高程内孤立波。在本研究中，我们基于观测结果和内波理论的比较，研究了低洼和高程isw的特征。结果表明，扩展的Korteweg-de Vries （EKdV）理论比KdV模型更能描述大振幅的洼地波，而大振幅的高程波更符合KdV方程而不是EKdV理论。利用内波理论和Morison公式，对假定的小直径圆柱桩在下沉波和高程波作用下的波致力进行了估计。文献中很少报道由高程isw引起的波致力。研究发现，高程波对桩的受力与洼地波有显著差异，高程波对低水柱桩的受力一般大于洼地波。这些结果表明，研究区域的isw对海洋工程结构构成严重威胁，在石油平台设计和海洋作业中不容忽视。
Both large amplitude depression and elevation internal solitary waves (ISWs) were observed on the continental shelf of the northwest South China Sea (SCS) during the Wenchang Internal Wave Experiment. In this study, we investigate the characteristics of depression and elevation ISWs based on comparisons between observational results and internal wave theories. It is suggested that the large amplitude depression wave is better represented by the extended Korteweg-de Vries (EKdV) theory than by the KdV model, whereas the large amplitude elevation wave is in better agreement with the KdV equation than with the EKdV theory. Wave-induced forces on a supposed small-diameter cylindrical pile by depression and elevation waves are also estimated using the internal wave theory and Morison formula. The wave-induced force by elevation ISWs is rarely reported in the literature. It is found that the force induced by the elevation wave differs significantly from that by the depression wave, and the elevation wave generally produces greater force on the pile in the lower water column than the depression wave. These results show that ISWs in the study area can present a serious threat to ocean engineering structures, and should not be ignored in the design of oil platforms and ocean operations.
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