摘要
导流明渠体型优化研究对保证施工安全、节约工程投资具有重要意义。应用平面二维水流数学模型,研究来流条件及导流明渠体型优化方式对导流渠过流能力及工程河段水力特性的影响。结果表明:当扩大相同大小的导流明渠断面面积时,相较于增加渠底宽度,增加渠深导流渠上游的壅水高度更低、导流渠内部及出口处水流紊动更弱;随断面增大,两种方案的导流渠上游最大相对壅水高度的差异增大;最大相对壅水高度随流量增大而增大,增加渠深方案的上游最大相对壅水高度随流量增大的增幅更小;增加渠深方案的导流渠内部最大流速更小,且水流归槽状态更好,堰面流速和回流强度更小。
The study of optimizing the shape of the diversion channels is crucial for saving project investment and ensuring construction safety.This paper applies a two-dimensional water flow mathematical model to study the effects of the incoming flow conditions and the optimization methods for the the shape of diversion channels on the overflow capacity of the diversion channels and the hydraulic characteristics of engineering reach.The results show that when the cross-sectional area of the same size diversion channel is expanded,compared to increasing the width of the channel bottom,the height of backwater in the upper reaches of the diversion channel is lower and the turbulence in the internal and outlet of the diversion channel is weaker.With the increase of the section area,the difference of the maximum relative backwater height in the upper reaches of the diversion channel between the two schemes increases.The maximum relative backwater height increases with the increase of flow rate.In the scheme of increasing channel depth,the maximum flow velocity inside the diversion channel is smaller,and the flow return state is better,and the flow velocity and backflow strength are smaller.
作者
卢勇
王志敏
赵紫辰
LU Yong;WANG Zhimin;ZHAO Zichen(The First Construction Company of CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430050,China)
出处
《水运工程》
2024年第7期201-209,共9页
Port & Waterway Engineering
关键词
导流明渠
体型优化
壅水
水力特性
数值模拟
diversion channel
scheme optimization
backwater
hydraulic characteristics
numerical simulation
