Tracer Test of Fracture-Karst Aquifer Recharge with Roofwater in Jinan of China

The monitoring data of recharge well and observation wells, in which have hydraulic link to some degree, are used to analyze effects of the fracture-karst aquifer recharge with roofwater. Because of the heterogenous karst development of limestone, the effective method of tracer test on the basis of determining groundwater flow direction is adopted to identify observation well and hydrogeological condition. Two tracer tests were conducted with salt as the tracer and the conductivity change with time of different groundwater levels was monitoring in the test site of University of Jinan. It was shown that the No.3 well could be used to monitor the effect of roofwater recharge and the apparent velocity of groundwater in this area was calculated as 9m/h~20m/h, which is significant for the karst aquifer recharge and environment evaluation in North China.