乌东德-白鹤滩枢纽间河段通航流态的三维数值模拟

采用数值模拟方法,对金沙江乌东德、白鹤滩枢纽建成后,乌东德-白鹤滩河段的通航问题进行了初步研究.基于ELCIRC模型,采用非结构网格,选取不同的下泄流量和水位控制条件,进行了水库联合调度条件下航道水流条件的三维数值模拟.分析了满足航深的条件下两坝间河段可能出现的局部碍航流态.计算结果表明,当乌东德水电站下泄流量为10,059,m3/s时,两坝间的航深基本能够满足四级航道标准;当下泄流量为1,830,m3/s和6,178,m3/s时,局部可能出现碍航流态,如金沙江与小江的汇流口处水流将呈现立轴环流.研究结果可为乌东德、白鹤滩枢纽的联合调度提供参考依据.

3D Numerical Simulation of Navigable Flow Conditions of River Reach Between Wudongde and Baihetan Reservoirs

A three-dimensional model based on unstructured grid called ELCIRC is used to study the navigable flowconditions of river reach between the Wudongde and Baihetan reservoirs. 3D numerical simulation was conducted toinvestigate the flow fields with different discharges and water stages under the operation of multi-reservoir. The flowmotion in the river reach was also analyzed. Calculation results show that, when the water discharge is 10 059 m^3/s,the water depth and flow field have no influences on the navigable flow conditions for five-hundred-tonnage fleet.However, the flow conditions of the river reach between the two dams cannot meet the needs of five-hundred-tonnagefleet when the water discharge is 1 830 m3/s and 6 178 m^3/s, respectively. In this situation, the navigable conditions arecomplicated in some areas, more vortexes occur, such as the vertical vortexeat the river confluence of Jinsha River andXiao Jiang. The research results will be some references for the selection of navigation routes and optimal operation ofmulti-reservoir of Jinsha River.