【摘要】 在变断面明渠,利用ADV测量流速,研究断面突然扩大情况下模型植物和真实植物的水流特性。结果表明:在水流稳定区域,布设真实鸢尾草和塑料鸢尾草模型的流速分布、雷诺应力分布和紊动强度分布具有一定相似性;雷诺应力和紊动强度在相对水深为0.6～1.1区域达到峰值,且从峰值区域向两端递减,总体上植物下部区域的紊动强度比植物上部区域大;同种植物紊动强度沿x、z方向的分布形式存在较大差别,紊动强度存在明显各向异性。更多还原

【Abstract】 Experiments were carried out in abrupt expanded cross section open channel and ADV was used to investigate the characteristics of water flow.The results show the similarity of velocity distribution,Reynolds stress distribution,turbulence intensity distribution of model vegetations and true vegetations.The maximum values of Reynolds stress and turbulence intensity occur at 0.6-1.1 relative water depth,and decrease to the both ends.In general,the turbulence intensity of the lower zone is greater than that of the upper zone.The turbulence intensity distribution of the x-direction and z-direction are very different,which shows anisotropy of the turbulence intensity.更多还原