Study on Air-Sea Gas Transfer at Natural Coast

对非破浪面、海岸构筑物前浪面和模型海滩破浪带的传质系数进行了实验和理论研究。结果如下：非破碎波表面上的再生：从中等规模波浪槽试验中获得的数据与从小型波浪槽中获得的数据进行了检验。结果表明，非破碎波表面的再生应由内摩擦引起的能量耗散以及罐侧壁和底部的摩擦引起。在此基础上，提出了一种预测真实海域非破碎波面全尺度传质系数的方法。此外，还对实际海域进行了一些计算，以便与horie 2提出的值进行比较。海岸构筑物前波面再生：利用小型波浪槽进行了海堤前波面传质系数的测量实验。装甲单位重量的影响也被检查。模型海滩上破碎带的再生：对模型海滩上破碎带的再生进行了研究。人们注意到海滩斜坡的影响，以及海浪规模的影响。试验结果表明，无论底坡、破碎类型和波浪周期如何，传质系数与能量耗散率都有很强且独特的关系。

Experimental and theoretical research to evaluate the mass transfer coefficient at the surfaces of non-breaking waves, on the surfaces of waves in frout of coastal structures, and on the breaker zone on a model beach was performed. The following is obtained as results.1.Reaeration on the surfaces of non-breaking waves : Data from a middle-scale wave tanktests were examined with data which have been obtained using a small-scale wave tank. It was shown that the reaeration at the surfaces of non-breaking waves should be causeb by energy dissipation due to internal friction, and due to frictions at side walls and bottom of the tank. On the basis of the examination, we proposed a method to predict the mass transfer coefficient in full scale at the surfaces of non-breaking waves in the real sea. In addition, some calculations on the real seas were performed for comparison with the value proposed by Horie.2. Reaeration on the surfaces of waves in front of coastal structures : Experiments to measure the mass transfer coefficient on the surfaces of waves in frout of sea wall were performed using a small-scale wave tank. The effects of the weights of armor units were also examined.3. Reaeration on the breaker zone on a model beach : Reaeration on the breaker zone on a model beach was examined. Attention was paid to the effects of the slopes of a beach, and to the effects of the scale of waves. From the examination, it was shown that the mass transfer coefficient has a strong and unique relationship with energy dissipation rate, despite the bottom slope, the type of breaking, and the wave period.