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3次元波浪砕波による波－構造物相互作用を経由した被災メカニズムの解明

通过 3D 波破碎导致的波-结构相互作用阐明损伤机制

基本信息

批准号：
11J04304
负责人：
三戸部佑太
金额：
$ 0.83万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2011
资助国家：
日本
起止时间：
2011 至 2012
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11J04304/
关键词：
砕波水面計測水面曲率波浪形状画像計測

项目摘要

本年度は申請者が開発した計測法による砕波水面形状計測をより多くの条件で行い、更なる考察を行った。崩れ波となるケースでは砕波直前の波峰部水面曲率は進行に伴い増加し、水面の限界形状に近づいて不安定が生じ砕波に至る。巻き波となるケースでも進行に伴い水面曲率が増加するが、砕波ごく直前に増加率が減少し限界形状より小さい曲率で砕波する。後者のケースでは砕波直前に波の前面勾配が急激に増加して非対称な波浪形状が発達し、波峰前後での圧力勾配の増加により前方に水塊が噴出する。以上二つの砕波過程は局所形状に起因するものであり、波一波相互作用や波一構造物相互作用を含む多様な環境での統一的な砕波限界の決定につながる重要な知見である。次に砕波後波峰方向に生じる水面変動のスケールを計測した水面形状から抽出した.砕波ジェット着水時に噴出する2次ジェットの高さおよび波長スケールはともに、斜面を駆け上がる波の加速度と重力加速度の比を示すSurf Similarity Parameterと正の相関がある。砕波初期は重力に起因する特殊なせん断場が形成されそれに応じた水面変動を生じるが、ボア形成後は相関がみられず水面変動の支配メカニズムが変化する。次に砕波後に噴出する多数のジェットの岸沖方向および波峰方向長さと岸沖方向速度を抽出し、水面下の渦が支配的で岸沖方向にスケールが大きく変化する大規模ジェットと、表面張力に起因し岸沖方向にほとんどスケールが変化しない小規模ジェットの2種類が形成されることを明らかにした。ジェットを水面に生じる乱れと捉え岸沖方向のスケール遷移をみることで、水面変動の支配メカニズムの遷移を説明可能となる。水面は水面下の流れ場を反映するとともにその圧力場を支配するものであり、砕波後の水面遷移についで本研究で取得した新たな知見は砕波波浪の海岸構造物への波圧特性を評価する上で極めて重要なものである。

This year, applicants will start to measure the shape of the water surface by using the method of measuring the shape of the water surface. This year, the applicants will carry out the calculation of the water surface shape of the water surface. The curvature of the water surface in the straight front of the collapse wave is closely related to the curvature of the water surface, and the shape of the water surface is close to that of instability. In order to increase the curvature of the water surface, increase the rate of increase, reduce the limit shape, and increase the curvature of the surface. The latter is connected to the front of the wave and is not called the shape of the wave, and the front and back of the wave are connected to the front and back of the wave. The shape of the above two waves is caused by the wave-wave interaction, the wave-wave interaction, the wave-creation interaction, including the critical wave limit of the multi-environmental system, which determines the importance of knowledge. In the direction of the crest of the secondary wave, the movement of the water surface is measured and the shape of the water surface is drawn out. When the wave wave hits the water, there are two waves, the wave length, the wave length, the acceleration of the wave, the acceleration of gravity, the ratio of the acceleration of the wave, the acceleration of gravity, and the ratio of the acceleration of the wave on the inclined plane shows that the Surf Similarity Parameter is in positive phase. In the early stage of the wave, the cause of the gravity wave is due to the formation of special weather stations and the formation of the water surface. After the formation of the wave, the water surface movement dominates the formation of the water surface. After the secondary wave, there is a surge in the direction of the wave crest in the direction of the wave, the speed in the direction of the peak of the wave, the speed in the direction of the shore, and the direction of the coast dominated by the sea under the surface of the water. The cause of the surface force is due to the change of the surface force in the direction of the shore. This is due to the fact that the surface force occurs in the direction of the shore. The surface of the water is in disorder, the direction of the bank is in the direction of the sea, the movement of the water surface is controlled by the movement of the water, and the movement of the water surface indicates that it is possible. The surface flow reflects that the force dominates the movement of the water surface and the movement of the water surface after the wave. in this study, we have obtained new insights into the coastal creations of waves, the properties of waves, the characteristics of waves, the characteristics of waves, and the characteristics of waves.