A High Precision Underground Water Tracing Test Technique and Its Applications:A Case Study in Maocun Karst System,Guilin, Guanxi
A High Precision Underground Water Tracing Test Technique and Its Applications:A Case Study in Maocun Karst System,Guilin, Guanxi
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发表时间：
2009
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通讯作者：
He Shi-yi
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作者：
He Shi-yi
A multi-tracing test was performed by the authors in Maocun underground river system near Guilin to understand the hydrogeological conditions and spatial characteristics of the water-holding media and to probe into the application of the high precision online tracing test technique to hydrogeological research. Practice shows that the new method is greatly superior to the traditional ones. The recovery rate of the injected tracer (uranine) at the main outlet is 34%, and the average speed of underground water flow is 35.3 m/h. It is estimated that 60%~70% of the total injected tracer was recovered during the tracing test. The final results indicate that the complicated underground system is located in an interfluve between the Maocun River and the Ganjiang paleo-river with several draining outlets, some of which remain unknown to us. The variation curve with several tracer concentration peaks recorded at the main outlet also indicates that there exist conduits and pools on the way the tracer migrates to the main outlet. There is a trail showing that the underground water moves to the southwestern part of the catchment through a fault (belt) in the dry season; nevertheless, further tracing test is needed to make sure if the water would overflow in this direction during the raining season. Another tracer, sulforhodamine B, was not detected at any receiving points because of several uncertain reasons. Moreover, the unbalance of discharge implies the possible existence of diving water flow in the drainage area.
