糯扎渡水电站多层进水口下泄水温三维数值模拟

3-D numerical simulation of water temperature released from the multi-level intake of Nuozhadu hydropower station

为减免水电站下泄低温水对下游河段生态环境的影响,糯扎渡水电站进水口拟采用分层取水叠梁门方案。为较好地模拟进水口前库区复杂的地形边界,采用σ坐标系,建立了糯扎渡水电站进水口分层取水下泄水温的三维数值模型,数值模拟结果得到了物理模型试验结果的验证。在已知库区水库水温分布的条件下,对不同的叠梁门运行方式,数值模拟了典型水平年十二个月份的下泄水温。进水口叠梁门方案分层取水对提高下泄水温有较为明显的作用,下泄水温提高的幅度,不仅取决于叠梁门的高度,还取决于水库水温垂向分布。

To reduce the negative effect of low-temperature water released from the intake on its environments downstream,a multi-level intake structure with stoplog gate is adopted in the Nuozhadu hydropower station.A 3D numerical model was developed to simulate the water temperature downstream of this power intake,and a σ-coordinate system is used to better adapt to the complex conditions of bottom topography in front of this intake.The calculations were verified by the experimental temperature data of a scale model.Temperature variations in a typical normal year under various operating rules of the stoplog gate were simulated with a specified inflow temperature profile.Results show that a multi-level intake with stoplog gate is effective in raising its downstream temperature that depends on the height of stoplog gate and the vertical temperature profile of its inflow.