摘要
以典型沉水植物狐尾藻和挺水植物菖蒲为研究对象,采用三维多普勒超声测速仪(ADV)对含双重植物明渠恒定水流的水力特性进行了试验研究,分析了含双重植物明渠水流的水力学特性及阻力特性并得出其曼宁糙率n的变化规律。结果表明,含双重植物的垂向流速分布基本呈"3"型分布,其紊流具有明显的各向异性特性,底层狐尾藻仅对其高度区域内的流速有较大影响,对高于其植物高度区域的断面流速影响不大。
Taking the typical submerged plant Myriophyllum and emergent plants Acorus calamus for an example,experimental research on hydraulic characteristics of open channels with double vegetation is performed by using ADV.Then it analyzes the hydraulic characteristics and the resistance characteristics of open channels flow with double vegetation,and obtains the variation rules of Manny factor.The results show that vertical velocity distribution of double vegetation appears a '3'-type curve,and its turbulence has obvious anisotropy.Besides,the bottom layerr Myriophyllum only has great effects on velocity within its height range while it has little effects on velocity of cross-section which is higher than the height of the plant.
出处
《水电能源科学》
北大核心
2010年第9期70-72,33,共4页
Water Resources and Power
基金
浅水湖泊综合治理与资源开发教育部重点实验室基金资助项目(2008KJ004)
