基于线阵CCD的波流调制效应水槽实验研究

发布时间：2018-04-30 13:15

本文选题：线阵CCD + 水槽实验　；参考：《海洋科学进展》2016年02期

【摘要】：波流调制效应是指海面非均匀流场产生的挤压和拉伸,进而导致海面局部小尺度波浪谱发生增强或削弱的效应,它是内波、海底地形、海洋锋面等多种海洋现象能被SAR等微波遥感手段观测到的重要物理机制。波流调制效应非常复杂,与海面风速、波浪谱、流场等因素都有关系,直接在海面上开展精确的实验测量非常困难,且重复性差,而在水槽内可以实现较为精确的测量和重复性。本文给出了在水槽实验室内基于线阵CCD同步获取水面波浪谱和流场的测量方法,克服了传统的传感器无法同步获取波浪谱和水面流场的缺点,并在分层流水槽内对孤立内波产生的非均匀流场的波流调制效应进行了观测。研究结果表明基于线阵CCD的测量方法是研究波流调制效应的有效手段,尤其适合对厘米/毫米波段小尺度波浪谱的波流调制效应的研究。此外,在波长小于3cm时波流调制模型的松弛率与经典模型的预测结果有较大出入,需要进一步深入研究。
[Abstract]:Wave-current modulation effect is the effect of squeezing and stretching produced by the inhomogeneous current field on the sea surface, which leads to the enhancement or weakening of the local small scale wave spectrum of the sea surface. It is the internal wave and the submarine topography. Ocean front and other marine phenomena can be observed by SAR and other microwave remote sensing means of important physical mechanisms. The modulation effect of wave and current is very complicated, which is related to the wind speed, wave spectrum, current field and so on. It is very difficult to carry out the accurate experimental measurement directly on the sea surface, and the repeatability is poor. More accurate measurement and repeatability can be realized in the tank. In this paper, a method for synchronously obtaining wave spectrum and current field of water surface based on linear CCD in flume laboratory is presented, which overcomes the shortcoming that traditional sensors can not simultaneously acquire wave spectrum and current field on water surface. The wave-current modulation effect of the inhomogeneous flow field produced by the solitary internal wave is observed in a stratified channel. The results show that the measurement method based on linear array CCD is an effective means to study the wave current modulation effect, especially for the wave current modulation effect of the small scale wave spectrum in the centimeter / millimeter wave band. In addition, when the wavelength is less than 3cm, the relaxation rate of the wave-current modulation model is quite different from that of the classical model, which needs further study.
【作者单位】：海军装备部驻天津军事代表局;中国科学院电子学研究所;微波成像国家重点实验室;
【基金】：国家自然科学基金项目——海面受限波雷达信号特性研究(41276185)
【分类号】：P731.2

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