含水生植物河道曼宁糙率系数的试验研究  

Experimental research on Manning's roughness coefficient of an open channel with aquatic vegetation

作　　者：郑爽[1] 吴一红[1] 白音包力皋[1] 穆祥鹏[1] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《水利学报》2017年第7期874-881,共8页Journal of Hydraulic Engineering

基　　金：中国水利水电科学研究院科研专项项目(水集0822)

摘　　要：水生植物是河流生态系统的重要组成部分,但水生植物的存在使得水流阻力增加,河道行洪能力降低,开展含水生植物河道曼宁糙率系数的研究,对河流生态综合治理具有重要意义。本文基于对含淹没柔性水生植物水流的室内水槽系列试验和量纲分析理论,分析了植物挺立度、相对淹没高度及相对密植度对河道曼宁糙率的影响,给出了淹没状态下含柔性水生植物河道的通用等效曼宁糙率系数经验公式。Aquatic vegetation is an important part of the river ecosystem,but the presence of them increas-es the flow resistance and reduces the flood capacity. Thus,to carry out the research on Manning＇s rough-ness coefficient in vegetated channel has important guiding significance for the comprehensive managementof river ecosystem. Based on a series of flume experiments with vegetated open-channel flow and dimension-al analysis theory,the plant upright degree,the relative submerged height and the relative planting densityof vegetation effects on the channel roughness are analyzed in this paper. And a universal equivalent Man-ning＇s roughness empirical formula is deduced which is applicable to the open channel with submergedaquatic vegetation. The formula is nV= n0（1＋αiN（1/4）（eδvh-1/h-1））δi= γiFrωi. In which,αi,δi,γi,ωi are the parameters for different plant species（i） and growth parameters,and they need to be determined byhydraulic experiments or field observations of specific aquatic plants.

关 键 词：柔性水生植物 植物挺立度 相对淹没高度 相对密植度 等效曼宁糙率系数 

分 类 号：TV131[水利工程—水力学及河流动力学]