柔性淹没植被间水流流速分布规律试验研究

Experimental Study on the Distribution of Water flow Velocity Among Flexibly Submerged Vegetation

为了研究柔性淹没植被带内植被间水流流速的分布规律,选用柔性塑料草进行水槽实验,在矩形和梅花形两种排列方式下,通过设置不同的流量和淹没度,对植被间沿水流和垂直水流方向的流速进行了分析。结果表明,植被间沿不同方向的纵向垂线流速曲线有较大差异;流量、淹没度等水流条件的增加和排列方式的交错化都会使植被对水流抑制效应增加,但水流条件对植被冠层区流速的影响要大于排列方式;垂线平均流速在两种排列下,随流量的增加,流速增幅减小,随淹没度增加,流速降幅增大;梅花形排列的流速较矩形小,水流条件改变时流速变动幅度也小,实际工程中阻滞水流、调洪和错峰效果更好。

In order to study the distribution law of water flow velocity between vegetation in flexible submerged vegetation zone,flexible plastic grass was selected for flume experiments,and the flow velocity between vegetation along the water flow and vertical water flow direction was analyzed by setting up different flow rates and submergence degrees under two arrangements of rectangle and plum blossom shape.The results showed that the longitudinal vertical flow velocity curves between vegetation along different directions were quite different;the increase of flow conditions such as flow rate and inundation degree and the staggering of the arrangement would increase the inhibition effect of vegetation on water flow,but the effect of flow conditions on the flow velocity in the canopy area of vegetation was greater than that of the arrangement;under the two arrangements,the mean flow velocity of the vertical flow line decreased with the increase of flow rate and increased with the increase of the inundation degree;the flow rate of the plum blossom shaped arrangement is smaller than that of the rectangle,and the change of flow rate is also small when the water flow condition changes,and the effect of blocking the water flow,flood control and peak shifting is better in the actual project.