关键词: 示踪试验, 岩溶管道, 穿透曲线, 岩溶地下水

Abstract:

To explore the application of tracer test in karst groundwater, the tracer test of the karst groundwater in the zone of Jiuzihai Swale - Ganze Spring in Lijiang River is taken as an example. According to the hydrological and geological conditions in the zone, the groundwater connectivity and flow field characteristics are analyzed, and the location of karst conduits are reckoned. A quantitative analysis of break-through curve (BTC) of the tracers is carried out by using Qtracer2 calculation model. The test results prove the existence of hydraulic connection in the zone of Jiuzihai Swale - Ganze Spring and other karst conduits. The structural and hydraulic parameters of the karst conduits are worked out, which confirmed that the karst groundwater is in the state of turbulent flow at a low velocity. It can be concluded that Qtracer2 is applicable to the quantitative analysis of BTC of tracers.

Key words: tracer test, karst conduit, BTC, karst groundwater