Hydraulic linkage of a storm water tank to a karst spring (Gallusquelle)

作者：Tranter Morgan^*; Schiperski Ferry; Zirlewagen Johannes; Scheytt Traugott

来源：Grundwasser, 2017, 22(1): 55-62.

DOI：10.1007/s00767-016-0346-8

• Contamination
• Dispersion
• Sulforhodamine G
• Tracer experiment
• Wastewater

A significant proportion of the global water supply is ensured by karst aquifers. However, these are often highly vulnerable to contamination. A storm water tank located in the rural karst catchment area of the Gallusquelle spring (Swabian Alb, southwest Germany) about 9.1 km away was identified as a potential source of contamination. A tracer experiment was carried out in order to evaluate this hydraulic connection. For this, 2.5 kg of the fluorescence dye sulforhodamine G was injected directly at the spillway location.
The proposed hydraulic connectivity of the storm water tank to the Gallusquelle spring has been confirmed with this experiment. The maximum tracer velocity of 149 m h(-1) highlights rapid groundwater flow through karst conduits. The low tracer mass recovery rate of 14.1% is an indication of a retention capacity along the flow path. This was confirmed by a release of withheld tracer triggered by a heavy storm event 16 days after the injection.

• 出版日期2017-3