淹没刚性植物水流纵向流速垂向分布研究

根据室内水槽试验和理论分析,提出了一种两层模型(植物层和植物层以上区域)来预测含淹没刚性植物水流纵向流速垂向分布。对于植物层以上区域,采用了与修改的混合长度理论相结合"新的植物边界层"的概念去分析,并提出了一个预测在这个区域水流的流速垂向分布模型。对于植物层,通过拟合试验数据给出了解析式。最后,通过试验结果分析,这种预测淹没刚性植物水流流速垂向分布的两层模型与结果具有很好的一致性。

Research on vertical distribution of longitudinal velocity in the flow with submerged vegetation

Based on the indoor flume experiment and theoretical analysis,a two-layer model(i. e.the vegetated layer and the upper non-vegetated layer) is proposed to predict the vertical distribution of longitudinal velocity in the flow with submerged vegetation. For the upper non-vegetated layer,a modified mixing length theory combined with the concept of the new vegetation boundary layer was adopted,and an analytical model was presented to predict the vertical velocity distribution in this region. For the vegetated layer,the analytical solution was presented by fitting the experimental data.Finally,by analyzing the experimental results,the two-layer model is in good agreement with the results.