作　　者： ; ; ; ;

机构地区： 湖南大学环境科学与工程学院

出　　处： 《湖南大学学报（自然科学版）》 2008年第6期67-71,共5页

摘　　要： 采用多普勒流速仪测量边壁附近的流速,用间接法中的流速测量法测量边界上的切应力,用棕榈毛作为植物的模拟材料.以植物高度表示有植物床面的粗糙突起程度,以高度的方差表示粗糙度的非均匀性.在植物密度和直径不变的情况下,对不同高度组合的植物进行了水槽试验研究.探讨了植物高度的非均匀性对水流阻力的影响.结果表明:与高度均匀的植物相比,随着植物非均匀性的增大,阻力的差异先增大后减小,最后非均匀性的影响消失. A Three-dimenslonal-acoustic Doppler velocimeter was used to measure the velocity near the wall, and the measured velocity was used to determine the shearing stress on the wall. The hair of palm was used to imitate the vegetations. The bed roughness height was expressed by the corrective height of vegetations, and the non-uniformity roughness was expressed by the variance of the height. As the density and the diameter were constant, an experimental study was carried out to analyze the resistance characteristics of the open channel flow with the vegetations composed of different non-uniformity properties. This influence was studied on the basis of the flume experiment, and the relationships between the vegetation height non-uniformity and the flow resistance were obtained. As the vegetation height non-uniformity increased, the difference of the flow resistance first increased, then decreased, and finally the influences disappeared.

关 键 词： 明渠水流 植物高度 床面糙率 非均匀性 水流阻力

领　　域： [环境科学与工程]