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在水体表面波的扰动作用下,水下光场随深度呈现较为明显的波动现象,且水中光合作用会对水下光场波动作出响应,因而此现象引起了广泛的关注。基于太湖梅梁湾观测的水下光场数据,计算了水下光场随深度的变化,并分析了其波动特征。结果表明:表面波引起了水下光场较为明显的波动现象,波动振幅最大的深度基本小于20 cm,远小于海洋中对应的深度;水下光场波动的振幅随深度呈e的负指数衰减,漫射消光系数越大,水下光场的波动衰减得也越快;当深度大于30 cm时,水下光场的扰动现象基本消失。还计算了船舶对水下光场观测的影响,发现直射光未被遮挡的情况下,漫射比例越高,其相对误差越大。
Under the disturbance of water surface waves, the underwater optical field exhibits obvious fluctuations with depth, and the photosynthesis in water will respond to the fluctuation of underwater optical field, so this phenomenon has aroused widespread attention. Based on the data of underwater optical field observed at Meiliang Bay in Taihu Lake, the variation of underwater optical field with depth was calculated and its fluctuation characteristics were analyzed. The results show that surface waves cause obvious fluctuations in the underwater optical field. The maximum amplitude of the fluctuation amplitude is basically less than 20 cm, which is much smaller than the corresponding depth in the ocean. The amplitude of the underwater optical field fluctuation with the depth is negative exponential decay , The larger the diffuse extinction coefficient is, the faster the attenuation of underwater optical field decays. When the depth is greater than 30 cm, the disturbance of underwater optical field disappears. The influence of the ship on the underwater light field is also calculated. It is found that the relative error is higher when the direct light is not blocked.