Spray generation a wave absorbing sea wall under s strong wind and transport process of spray in the leeward direction.

浪花在强风作用下形成吸浪海堤，并在背风方向输送浪花的过程。

• 批准号: 07650604
• 负责人: MATSUNAGA Nobuhiro
• 金额: $ 1.34万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650604/
• 关键词: Coastal environments; Salt damege; Sea water spray; 沿岸海域環境; 沿岸構造物; 物質輸送

Studies of 'Spray generation from a wave absorbing sea wall under a strong wind and transport process of spary in the leeward direction' have been made with the aid of a grant form the Ministry of Education, Science, Sports and Culture. The results are summarized as follows.1.Spray generation and transport process from a wave absorbing sea wall.2.Model experiments were carried out for a wave absorbing sea wall with a standard cross-section which is built at Beppu Port in Oita Prefecture.1) Near the sea wall, the spray concentration is determined by the equilibrium between the advection of spray and its sedimentation. In a region far from the sea wall, the spray becomes very small and is in the equilibrium between its advection and diffusion.2) A flow chart is obtained to estimate the spray concentration near a sea wall.2.Transport process of spray above a beach model.It is very important to understand the difference between the transport processes of spray above a natural beach and a beach protected by man-made structures. From such a point of view, the transport process of spray above a beach model was investigated experimentally.1) In an offshore zone, the vertical profiles of spray quantity and spray concentration are uniform in the leeward direction. They are determined by the balance between the diffusion of spray and its sedimentation.2) In a shallow region, the balance in an offshore zone is broken and the concentration decreases rapidly in the leeward direction.3) Above the ground, the balance between the advection of spray and its diffusion is formed because no spray is supplied from the lower boundary and very small spray is transported.

在文部科学省的资助下，进行了“强风作用下吸波海堤的喷雾产生及喷雾向下风方向的输送过程”的研究。主要研究结果如下：1.吸波海堤的喷雾产生和输送过程。2.对大分县别府港修建的标准断面吸波海堤进行了模型试验。1）在海堤附近，喷雾浓度由喷雾平流与沉降之间的平衡决定。在远离海堤的区域，喷雾变得非常小，并处于平流和扩散之间的平衡。2）获得了估算海堤附近喷雾浓度的流程图。2.海滩模型上方喷雾的传输过程。理解天然海滩和人工建筑物保护的海滩上方喷雾传输过程的差异非常重要。从这个角度出发，对海滩模型上方喷雾的输送过程进行了实验研究。1)在近海区域，喷雾量和喷雾浓度的垂直分布在背风方向上是均匀的。它们是由喷雾的扩散和沉积之间的平衡决定的。2）在浅水区域，近海区域的平衡被打破，浓度在背风方向迅速降低。3）在地面上，由于下边界没有喷雾供给，输送的喷雾量很小，因此形成喷雾的平流和扩散之间的平衡。

项目成果

松永信博: "波に作用する風応力としぶき量の関係" 海岸工学論文集. 42. 1031-1035 (1995)

Nobuhiro Matsunaga：“作用于波浪的风应力与喷雾量之间的关系”海岸工程杂志 42. 1031-1035 (1995)。

N.Matsunaga: "Wind-Induced Waves and Currents in a Nearshore Zone" Proc.25th Int.Conf.on Coastal Engineering. (1996)

N.Matsunaga：“近岸区域的风致波浪和洋流”Proc.25th Int.Conf.on Coastal Engineering。

松永信博: "風応力作用下で生ずる傾斜海浜モデル上の波と流れ" 海岸工学論文集. 43. 386-390 (1996)

Nobuhiro Matsunaga：“风应力作用下斜坡海滩模型上的波浪和水流”海岸工程杂志 43. 386-390 (1996)。

N.Matsunaga, M.Hashida and K.Uzaki and K.Kishioka: "'Decreasing rate of spray quantity transported from offshore zone to nearshore zone by a strong wind' (in Japanese)" Proc.of Coastal Engineering, JSCE. Vol.43. 1186-1190

N.Matsunaga、M.Hashida、K.Uzaki 和 K.Kishioka：“‘强风从近海区域向近岸区域输送喷雾量的速度下降’（日语）”Proc.of Coastal Engineering，JSCE。