生态浮床根系密度及过流流量对矩形明渠水力特性的影响
Effect of Floating Vegetation Island Root Density and Overland Flow on Hydraulic Characteristics of Rectangular Open Channels
马超 1霍一迪 2王家璇 2张付成2
作者信息
- 1. 天津大学 建筑工程学院,天津 300072;天津大学 水利工程仿真与安全国家重点实验室,天津 300072
- 2. 天津大学 建筑工程学院,天津 300072
- 折叠
摘要
针对河道中生态浮床对水力特性的影响不明确、不利于河道行洪排涝等问题,研究了生态浮床对矩形明渠水力特性的影响.首先,基于 ANSYS-fluent软件,利用多孔介质概化生态浮床,构建了含生态浮床的矩形明渠三维水动力数值模拟模型;然后,用水槽试验验证了该模型的可行性,在此基础上探索了生态浮床根系密度、过流流量对矩形明渠水流水动力特征及其变化规律的影响.结果表明,生态浮床段的流速在垂线上呈"S"型三区分布,且根系密度及过流流量的增大使流速的三区分布更显著;紊动能和雷诺应力与生态浮床根系密度和过流流量成正比,可见生态浮床根系密度和过流流量对明渠水力特性影响较大.
Abstract
In view of the unclear influence of floating vegetation islands(FVIs)in rivers on the hydraulic characteris-tics,which is not conducive to river flooding and drainage,this paper conducts a study on the hydraulic characteristics of FVIs on rectangular open channels.Firstly,a three-dimensional hydrodynamic simulation model of a rectangular open channel with a FVI was constructed based on ANSYS-fluent software using a porous medium to generalise the FVI.Then,the feasibility of the model was verified using flume tests,and on this basis,the effects of the FVI root density and overflow flow on the hydrodynamic characteristics of the rectangular open channel water flow and its change pattern were explored.The results show that the flow velocity in the FVI section has an"S"-shaped three-zone distribution on the ver-tical line,and the increase of root density and overflow flow makes the three-zone distribution of flow velocity more sig-nificant;The turbulent kinetic energy and Reynolds stress are proportional to the root density and overflow flow of the FVI,in-dicating that the FVI root density and overflow flow have a greater influence on the hydraulic characteristics of the open channel.
关键词
生态浮床/根系密度/过流流量/数值模拟/流速分布/紊动能/雷诺应力Key words
floating vegetation islands/root density/overland flow/numerical simulation/flow distribution/turbu-lence energy/Reynolds stress引用本文复制引用
基金项目
水体污染控制与治理科技重大专项(2017ZX07106-004)
出版年
2024
NETL
NSTL
维普
万方数据