摘要
为研究不对称局部溃决洪水在弯道中的变化规律,采用三维湍流模型计算了坝体左侧30%面积局部瞬溃后,洪水在六种曲率半径右弯河道中的演进特性。结果表明,溃坝洪水的演进呈现扩散、雍水、反射和波动四种特征。当大坝下游接长约为19.5倍坝前水深的右弯河道时,溃坝洪水出弯道,再经过15倍坝前水深距离后,水深便不再受弯道曲率的影响。弯道曲率对溃坝洪水流量过程及峰值流量几乎无影响,根据实验结果,拟合了弯道段与下游直段中峰值流量的经验公式。
To investigate the variation laws of floods caused by asymmetrical partial dam breaches in curved channels,a three-dimensional turbulent flow model was employed to simulate the flood propagation in six right-bending channels with varying curvature radii following an instantaneous 30%left-side partial breach.Experimental results demonstrate that the flood propagation from an asymmetrical partial dam breach in a curved channel exhibits the following features:diffusion,backwater effects,wave reflection,and oscillations.When the downstream of the dam is connected to a right-bend channel with a length of approximately 19.5 times the upstream dam water depth,the water depth is no longer influenced by the bend curvature after traversing a distance of about 15 times the initial water depth when the breach flood exits the bend.The curvature radius of the bend shows negligible influence on the flood discharge process and peak flow.Based on experimental data,empirical formulas were fitting to predict peak discharge in both the curved segment and the downstream straight channel.
作者
孙宇佳
张法星
张力元
郭帆
喻泽
SUN Yujia;ZHANG Faxing;ZHANG Liyuan;GUO Fan;YU Ze(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China)
出处
《四川水力发电》
2025年第S2期56-63,共8页
Sichuan Hydropower
基金
国家自然科学基金项目(52192673)。
关键词
弯曲河道
局部溃决
溃坝洪水
数值模拟
曲率半径
curved channel
partial dam-break
dam-break flow
numerical simulation
curvature radius
作者简介
孙宇佳(2001-),女,山西长子人,硕士,从事工程水力学方面工作;张法星(1979-),男,山东嘉祥人,研究员,博士,从事水力学教学与科研工作;张力元(1996-),男,四川渠县人,博士,从事工程水力学方面工作;郭帆(1998-),女,四川成都人,硕士,从事工程水力学方面工作;喻泽(2001-),男,湖北武汉人,硕士,从事工程水力学方面工作.
