不同布置形态下刚性淹没植被对水流特性的影响

自然河道中植被呈现多种多样的分布状态,为探究不同布置形态下刚性淹没植被对水流特性的影响,利用室内水槽模拟含刚性淹没植被的明渠进行试验研究。结果表明:刚性淹没植被的布置形态对明渠流水流特性影响显著。在本文研究的植被布置形态下的水深、植被阻力系数与植被粗糙系数均增大,表现为交错型布置斑块型布置线性布置;流速与雷诺数均减小,表现为线性布置斑块型布置交错型布置;糙率n随着平均流速与水力半径之积VR的增大而减小。

Influence of rigid submerged vegetation on flow characteristics under different vegetation layouts

There are various distribution patterns of vegetation in natural rivers. In order to investigate the influence of rigid submerged vegetation on the flow characteristics under different layout patterns, the experiment was carried out using the glass sink in the laboratory to simulate the open channel with rigid submerged vegetation. The results show that the arrangement of rigid submerged vegetation has a significant effect on the flow characteristics of open channels. The water depth, vegetation resistance coefficient and vegetation roughness coefficient under vegetation layout all increase, and the spicific staggered arrangement>patch type arrangement > long strip arrangement. Both the flow velocity and the Reynolds number decrease, showing a long strip arrangement>a patch type arrangement>a staggered arrangement. The roughness n decreases as the average flow velocity and the hydraulic radius VR increases.