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Study on Air-Sea Gas Transfer at Natural Coast

天然海岸海气输送研究

基本信息

批准号：
08650614
负责人：
KAKUNO Shohachi
金额：
$ 1.34万
依托单位：
Osaka city University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650614/
关键词：
REAERTION AERATION WAVE SURFACE BREAKER MASS TRANSFER BEACH

项目摘要

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.

进行了实验和理论研究，以评估非破碎波表面、沿海结构物的波浪表面以及模型海滩的破碎区的传质系数。获得以下结果： 1.非破浪表面上的反应：将来自中型波浪池试验的数据与使用小型波浪池获得的数据进行检验。结果表明，非破碎波表面的再曝气应是由于内摩擦以及罐侧壁和底部摩擦引起的能量耗散引起的。在此基础上，我们提出了一种全尺度预测真实海域非破碎波浪表面传质系数的方法。此外，还对真实海域进行了一些计算，以与Horie.2提出的值进行比较。沿海建筑物前面波浪表面的再反应：使用小型波浪池进行了测量海堤前波浪表面传质系数的实验。还检验了装甲单元重量的影响。 3．模型海滩上的碎浪区的再曝气：检查了模型海滩上的碎浪区的再曝气。人们关注了海滩坡度的影响以及波浪规模的影响。检验表明，与底部坡度、破碎类型和波浪周期无关，传质系数与能量耗散率具有很强且独特的关系。