摘要
本文使用循环水槽生成恒定均匀的流体过地形产生内波,并借助染色技术、PIV技术和高速图像记录系统来开展相关实验。实验设置了6组不同的障碍比B(障碍物高度与下层水深之比),对均匀流过地形生成内波的演化特征进行了探究。通过定性分析和定量测量表明:当0.6<B<0.8时,内波的波形比较稳定且不易破碎;当B<0.6时,潮流受障碍物的影响较小;当B>0.8时,波形较陡且容易破碎与混合。并且随着障碍比的增加,内波的振幅和能量逐渐增加,波长和生成位置与障碍物间的距离S逐渐减小,并且内波的非线性效应逐渐增强。PIV实验表明当流体经过地形生成内波的过程中,在地形背面会有顺时针涡旋的产生。
The internal waves generated by uniform flow over topography were investigated by using circulating water tank. The related experiments were carry out with the help of dyeing technology, particle tracer technique and high-speed image recording system. Six kinds of different barrier ratio B （the ratio of the harrier height to the lower layer water depth） were set up, to explorethe evolution characteristics when uniformflowover the topography. The qualitative analysis and quantitative measurementssuggested that when 0.6〈B〈0.8, the waveform is stable and not easy to break; when B〈0.6, the obstacle has little effect on the current; when B〉 0.8, the waveform is steep and easy to break and mix. And with the increase in B, the amplitude and energy of the internal waves inereasegradually, wavelength and the distance S decrease, and thenonlinear effect is gradually strengthened. PIV experiments show that in the generating process of the internal waves when the fluid passes through the obstacles, clock-wise vortex on the lee side of the obstacle can he generated.
出处
《海洋湖沼通报》
CSCD
北大核心
2017年第5期1-8,共8页
Transactions of Oceanology and Limnology
基金
国家自然科学基金(41440038
41576021)
关键词
循环水槽
内波
障碍比
分层染色技术
PIV
circulating water tank
internal waves
the blocking degree
stratified dyeing technique
PIV
