Abstract:

Tracer test as an important hydrogeology test, are widely used to explore the hydraulic connectivity underground, measure the groundwater flow velocity. According to the fast flow in karst aquifer, a mathematic model based on the dilution function of convection is proposed. By means of this model and the linear relationship between electricity conductivity and solution concentration, the authors can easily and accurately calculate the groundwater runoff of source well and the tracer concentration in the original groundwater. In this case study, the runoff of source well which in Chenqi of Houzhai underground river basin is 0.241 2 m³/min. Furthermore, supplemented with necessary hydrogeology investigation, the groundwater flow velocity and aquifer conductivity can be estimated.

Key words: tracer test, groundwater runoff, convection dilution, hydrogeological parameters