Abstract
Laolongdong Underground River used to be important drinking water source, but the water quality has been deteriorated since 1990s and the underground river becomes a sewer nowadays because of anthropogenic and urbanization influence. In order to find out the impacts of water-bedrock interaction, domestic sewage and agricultural activities on groundwater, the chemical characteristics of the groundwater were monitored each month to research the contamination sources and the contributed factors. The result shows that the groundwater is characterized as the HCO3-SO4-Ca type, which implys that groundwater geochemistry is controlled by middle and lower Triassic carbonate rocks. Moreover, the concentrations of K+, Na+, Cl-, and PO43-reveale an increasing trend and NO3-deceasing from 2008 to 2012. According to general contamination sources, the data implys that urbanization process and land use changing caused karst ground water pollution process and contaminations convert from agriculture effort to sewage and animal feces effort.
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