• The Journal of Engineering Geology
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• v.21 no.4
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• pp.369-379
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• 2011

The application of appropriate rehabilitation works can improve productivity and water quality of clogged wells, with extending the operation of the wells for a certain period. This study verified rehabilitation effect of the clogged wells by means of explosive method and air brush surging and by using hydraulic tests, water quality, and geophysical logs (optical and acoustic televiewer logs) before and after the cleaning works on the two wells drilled in bedrock in Mt. Geumjeong, Busan City. Air-brush surging method resulted in maximum 273% increase of the productivity with the concentration of $F^-$, $SiO_2$, and a decrease of turbidity and the concentration of $Cl^-$, $NO_3^-$. The explosive method resulted in maximum 156% increase of the productivity with an increase of the concentration of $F^-$, $SiO_2$ and a decrease of turbidity, $Cl^-$, $NO_3^-$.