Radar observations of the ocean surface can be affected by impacting raindrops. Ring-wave measurements are presented for drops of 2.2 and 2.8 mm in diameter impacting on fresh and salt water surfaces initially at rest. They are based on the observation of the mirror image of a sharp edge on the perturbed surface. The retrieved wave profiles show a rather stable characteristic wavenumber (0.2 mm/sup -1/) and very small wave amplitudes: the fraction of the incident kinetic energy converted into ring-waves is of the order of 1%.
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机译:雨滴可能会影响雷达对海面的观测。给出了在静止状态下,直径为2.2和2.8毫米的水滴撞击到淡水和盐水表面的环形波测量结果。它们基于对被扰动的表面上的锐边的镜像的观察。检索到的波剖面显示出相当稳定的特征波数(0.2 mm / sup -1 /)和非常小的波幅:转换成环形波的入射动能的分数约为1%。
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