柔性植物消浪及沿程阻流特性试验研究  

A Physical Model Study of the Effect of the Flexible Vegetation on Wave Height Attenuation and Along the Way of Flow Structure

作　　者：吴迪[1] 冯卫兵[1] 石麒琳 

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《人民黄河》2014年第12期79-81,84,共4页Yellow River

摘　　要：采用聚乙烯仿真绿色植物模拟柔性植物,通过物理模型试验研究了柔性植物对波高和断面流速分布的影响,结果表明:波高消减系数大小与水流速度大小无明显关系;植物出水0.5倍波高时消浪效果最好,水深越大波浪消减效果越差;柔性植物使断面流速在植被上部冠层区域减小,特别是植被带中和植被带下游边缘处,冠层区域流速减小显著;水流通过植被带以后,在植被带下游断面流速垂向分布逐渐恢复至与上游断面一致,但大流速情况下流速恢复较慢;波流共同作用下断面流速的垂向分布与纯流速作用下基本一致,但在波浪作用下断面流速减小区域有下移趋势。The experiment took the way of using polyethylene greenery to simulate flexible plant,and it also studied the influence which flexible plant had on the wave height and cross-section velocity distribution. The result shows the following conclusions. Firstly,the change of waves of re-duction coefficient has no obvious regularity when flow velocity changes. Secondly,wave dissipating effect is quite obvious when plants that pass the vegetation zone are 0. 5 times as high as wave height. Besides,the deeper the water is,the worse the wave dissipating effect is. Thirdly,flexible plants reduce cross-section flow velocity in the region of the upper vegetation canopy. And flow velocity in canopy area decrease significantly espe-cially in and at the downstream edge of the vegetation zone. Cross-section velocity vertical distribution in the downstream of vegetation zone goes gradually closer to the one in the upper after the water flows through plants,but it changes slower at large flow velocities. Cross-section velocity vertical distribution under the action of wave and flow together is almost the same as just under the action of the flow,but cross-section flow veloci-ty decreased area has the downward trend under the action of wave and flow.

关 键 词：柔性植物 波高消减系数 断面流速分布 波高 

分 类 号：TV877[水利工程—水利水电工程]