摘要
分汊河道的分流规律是研究分汊河道水流特性的基本问题之一,赣江尾闾河段是典型的多级分汊河道。根据尾闾河段的河道特点,采用有限体积法离散控制方程,建立平面二维数学模型,根据各水位站实测资料对模型进行率定验证,然后运用该模型模拟分析丰水年尾闾河段东西河的分流规律。结果表明:(1)在鄱阳湖未对赣江尾闾河段产生回水顶托作用时,外洲流量对东西河分流比起决定性作用,当外洲流量为3900 m3/s时,东西河分流约各占50%。(2)当鄱阳湖对赣江尾闾河段产生回水顶托作用时,尾闾河段水流条件复杂,此时东西河分流比由水位差与外洲流量共同决定。
The diversion rule of the branch channel is one of the basic problems to study the flow characteristics of the branch channel.The Weilu reach of the Ganjiang River is a typical multi-level branch channel.According to the channel characteristics of the Weilu reach,the finite volume method is used to discretize the control equations,and a plane twodimensional mathematical model is established.The model is calibrated and verified according to the measured data of each water level station,and then the model is used to simulate and analyze the diversion rule of the east-west river in the Weilu reach in wet years.The results show that:(1)When Poyang lake does not have a backwater support effect on the Weilu reach of the Ganjiang river,the flow of the outer continents plays a more decisive role in the diversion of the East-West river.When the flow of the outer continents is 3900 m^(3)/s,the diversion of the east and west rivers accounts for about 50%each.(2)When Poyang lake has a backwater supporting effect on the Weilu reach of the Ganjiang River,the water flow conditions of the Weilu reach are complex,and the diversion ratio of the east and west rivers is jointly determined by the water level difference and theflow in the outer continents.
作者
田童晖
苗磊
张蕾
赵新宇
Tian Tonghui;Miao Leil;Zhang Leil;Zhao Xinyu(Shaanxi Reconnaissance Design&Research Institute of Water Environmental Engineering,Xi'an 710018,Shaanxi;Jiangxi Engineering Research Center of Water Engineering Safety and Resources Efficient Utilization,Nanchang 330099,Jiangxi)
出处
《陕西水利》
2022年第12期39-42,共4页
Shaanxi Water Resources
关键词
分汊河道
分流比
数值模拟
赣江尾闾
Branch channel
diversion ratio
numerical simulation
Ganjiang Weilu
