Development of unsteady wave measurement system using remote sensing.

近二十年来，非定常波浪测量系统得到了迅速发展，但主要是点式测量系统。本研究尝试利用遥感影像分析方法，同时获得一个平面上的波浪分布，并获得平面数据的时间历程。首先，利用投影光分布法测量了入射波中的非定常波。从投影光分布图像中可以重建非定常波，用最小二乘法可以获得较高的精度。其次，从反射光分布图像计算波梯度。波的分布由线积分重建。可以通过使用随机图像或颜色分布图像来测量波。在研究了什么样的图像适合测量后，确定了合适的直方图宽度和颗粒数。为了将本方法应用于自然界中的一些现象，本文提出了一些海洋模型的计算方法，并进行了数值模拟。

For the past two decades, the measurement system of the unsteady waves have been developed rapidly However, it is mainly point measurement system. In this study, image analysis methods using remote sensing were tried to get the wave distribution on one plane simultaneously and to get time history of plane data. First, the unsteady waves in the incident wave was measured by using projected light distribution method. From the images of projected light distributions, the unsteady wave could be reconstructed The higher accuracy was obtained by least square method. Secondly, the wave gradient was computed from the reflected light distribution images. The wave distribution is reconstructed by line integral. The wave can be measured by using random images or color distribution image. After investigating what kind of image is suitable for measurement, suitable width of histogram and number of particles were decided. The results agreed well with point measurement data or theory.To apply the present method to the phenomena in the nature, some ocean model computation method was developed and computed to simulate the images.