湖北碾盘山水利水电枢纽导流明渠和泄水闸联合过流模拟研究

Numerical simulation study for the combined discharge by the open diversion channel and sluice gate of Nianpanshan Complex of Hubei Province

湖北汉江碾盘山枢纽为Ⅱ等大(2)型工程,枢纽为河床式电站。目前导流明渠左侧副坝已施工完成,基坑内泄水闸已基本完工,电站厂房、船闸尚未完工。坝体临时度汛标准为100年一遇,当发生10年一遇以上洪水,由导流明渠和泄水闸联合下泄,由于种种原因,汛前围堰全部拆除难度较大,导致泄水闸不能完全按照泄流能力泄洪。因工期紧、施工度汛过流条件及工况复杂,物理模型试验往往不能及时模拟。通过平面二维水流数学模型,根据施工进度实时、动态模拟泄水闸与导流明渠联合过流工况,得出合理分流比,为施工安全度汛提供技术支撑。

The Nianpanshan Complex on the Han River in Hubei Province is a Class II large(2)type project,which is a riverbed type power station。At present,the construction of the left auxiliary dam of the diversion channel and the sluice gate in the foundation pit has been basically completed,the power house and the navigation lock have not been completed.The temporary flood control standard for the dam body in flood period was designed to retain floods of 100 years recurrence period.When a flood occurs with a frequency of once every 10 years or more,the diversion channel and sluice gate jointly discharge the water..Due to various reasons,it is difficult to remove all the cofferdams before the flood,resulting in the sluice gate not being able to fully discharge the flood according to its discharge capacity.Due to tight construction schedules,the complex flood conditions and working conditions,Physical model tests often cannot be simulated in time。In this paper,by using a planar two-dimensional flow mathematical model,the combined flow conditions of the sluice gate and the diversion channel are simulated in real-time and dynamically based on the construction progress,and a reasonable diversion ratio is obtained to provide technical support for safe flood management during construction.