库区洲滩潜流带温度示踪流速计算方法

Calculation method of temperature tracing velocity in the hyporheic zone of the reservoir continent beach

以澜沧江漫湾库区洲滩为研究对象,实时监测水库运行期间洲滩监测井水位和水温变化过程,依据水位和水温数据,分别用水动力学法和温度示踪法核算流速。结果表明:在计算库区水位波动引起的潜流交换上,Hatch相位法具有更高的准确性,监测时段内的潜流交换流速和交换量分别为-5.87×10^(-5)~12.92×10^(-5)m/s和2.66m^3。在计算库区与洲滩补给和排泄过程中的峰值流速时,Hatch相位法的计算结果均较水动力学法滞后。在空间上,洲滩深度越深,流速越小,不同深度流速曲线规律基本一致。

Taking the Manwan Reservoir continent beach of Lancang River as the research object,during reservoir operation,water level and temperature was real-time monitored. The infiltration flow velocity was calculated by hydrodynamic method and temperature tracer method according to the data of water level and temperature. The results show that the Hatch phase method has higher accuracy in calculating the subsurface flow exchange caused by the water level fluctuations in the reservoir area,the flow exchange velocity ranged from -5. 87 × 10（-5） m/s to 12. 92 × 10（-5） m/s,and the hyporheic exchange volume is 2. 66 m3 during the monitoring period. The results of Hatch phase method lagged behind hydrodynamic method when calculating peak flow velocities. The velocities decreased with the increase of the depth in island,and the curves of flow velocities at different depths are similar.