水利学报2018，Vol.49Issue(4)：397-403,418,8.DOI:10.13243/j.cnki.slxb.20171263
明渠漂浮植被水流内部能量损失和传递规律研究
Study on mechanism of energy spending and transition in open channel flow with suspended canopy
摘要
Abstract
Suspended canopy in open channel would have an adverse impact on flow capacity.Based on the previous theory of energy balance mechanism,this paper analyzed the energy transition law and energy balance mechanism of uniform flow section of open channel with suspended canopy,and has derived the expression of energy borrowing,energy spending,energy transition and relative accumulate values.Using Plew's experimental data of velocity and shear stress,the distribution of energy accumulation along the water depth has been obtained.The result shows that whether at a point or in a cross-section,the energy borrowing is equal to the sum of local energy spending and local energy transition.Energy spending is concentrated in the vegetated layer,reaching the maximum at the interface of vegetation and non-vegetation layers.The total energy transition in the cross section is zero.The energy borrowing in the vegetated layer and the riverbed cannot compensate for the energy spending.So surplus borrowed energy in other parts were needed to be transmitted to these two parts.In the near bed layer,the accumulate values of turbulent energy and energy transition are quite the same,which indicates that most of the energy in this layer is converted into turbulent energy,and only a very small part is converted into heat in order to withstand the resistance in the near bed layer.关键词
漂浮植被/恒定均匀流/能量损失/能量传递/能量平衡Key words
suspended canopy/steady uniform flow/energy spending/energy transition/energy balance分类
建筑与水利引用本文复制引用
槐文信,钟娅,杨中华..明渠漂浮植被水流内部能量损失和传递规律研究[J].水利学报,2018,49(4):397-403,418,8.基金项目
国家自然科学基金项目(51439007,11672213) （51439007,11672213）
