基于温度示踪的渭河西咸新区段潜流交换研究

Hyporheic Study of Weihe River in Xi-Xian New Zone Based on Temperature Tracer

为了探索地表水和地下水相互作用的动态变化特征,使用温度传感器对渭河西咸新区段的潜流交换过程进行了温度监测试验,采用温度示踪法分析了潜流交换的动态变化机制。结果表明:左岸与右岸试验点的补给关系均为地表水补给地下水;除去降雨和气温影响较大的0.05~0.15 m深度,左岸试验点在0.70~1.00 m深度潜流交换最为剧烈,右岸试验点在0.40~0.70 m深度潜流交换最为剧烈;潜流通量越稳定,其不确定性区间宽度也越稳定;潜流带沉积层温度对气温的波动响应具有垂直方向的空间变异性。

With the further study of hyporheic exchange and the development of sensor technology,it got very convenient and useful to trace hyporheic flow with longer serious temperature data in streambed. In this thesis, with the serious data set which collected by temperature sen-sors in Xi-Xian New Zone section of Weihe River in Shaanxi Province,the results show th a t： river recharges groundwater in Xi-Xian New Zone section of Weihe River in Shaanxi Province; the temperature of deeper stream bed response to the change of river temperature is more slowly than that of the upper streambed; the hyporheic flow shows great spatial variability with higher absolute hyporheic flowvalues got between 0.70-1.00 m at the left side bank streambed, and between 0.40-0.70 m at the right side regardless of the 0.05-0.15 m changes great with temperature and rainfall; when hyporheic flow changes little with time, the uncertainty band is also steady; hyporheic flow shows great spatial variability in the river streambed at the two trial sites.