热量示踪在潜流带水动力交换量计算中的应用

Using Heat as a Tracer to Quantify Hydrodynamic Exchange within Hyporheic Zone

精确计算潜流带内的水动力交换量始终是一个挑战,而新兴的温度示踪方法在这方面的应用具有其独特的优势.在介绍温度示踪理论及计算方法的基础上,以大克泊湖（西侧）为例,进行潜流带水动力交换量的计算,其结果表明：监测时段内地下水流方向为地下水补给湖水,渗流速度大小为0～2 cm/d,累计交换量为2.35 cm.此外,通过与水动力学方法渗流速度计算结果进行对比分析可以看出,2种方法的计算结果较为接近,表明温度示踪方法在潜流带孔隙水渗流速度计算中的应用具有较好的准确性,适用于潜流带内水动力交换量的精确计算.

The emerging temperature tracer method has its own unique advantages in accurate calculation of the amount of hydrodynamic exchange in the hyporheic zone,which is always a challenge.On the basis of introducing temperature tracing theory and calculation methods,we calculate the amount of hydrodynamic exchange in the hyporheic zone of the Dakepo Lake as a case study.Results show that during the monitoring period,the magnitude of flow velocity that groundwater recharges lake is between 0 ～2cm/d,and the amount of total exchange is 2.35cm.In addition,by comparing with the results of hydrodynamic method,we can see that the results of the two methods are close,which indicates that the temperature tracer method has good accuracy for the calculation of pore water flow velocity,and is suitable for the accurate calculation of hydrodynamic exchange capacity in the hyporheic zone.