The Hyporheic Dynamic Study Based On Temperature Tracer

With the further study of hyporheic exchange and the development of sensor technology, it gets very convenient and useful to trace hyporheic flow with longer serious temperature data in streambed. In this master thesis, with the serious data set which collected by temperature sensors in Xixian New Zone section of Weihe River in Shaanxi Province, the result shows that: 1) river recharges groundwater in Xixian New Zone section of Weihe River in Shaanxi Province; 2) the temperature of deeper streambed response to the change of river temperature more slowly than the upper streambed; 3) the hyporheic flow shows great spatial variability with higher absolute hyporheic flow values got between 0.05-0.15 m and 0.75-1.00 m at the left side bank streambed, and between0.40-0.75 m at the right side; 4) the sensitivity analysis result shows that hyporheic flow increases with the increase of total porosity,dispersivity,thermal conductivity and volumetric heat capacity of sediment, but decreases with the increase of volumetric heat capacity of the water except 0.40-0.75 m at the left side bank streambed and 0.05-0.15 m at the right side bank streambed because of the spatial variability of river sediments; 5) hyporheic flow is most sensitive to thermal conductivity, and then follows dispersivity and total porosity, and volumetric heat capacity of sedimen and water shows great spatial variability.