Abstract
To estimate the influence of river water infiltration on groundwater chemistry in a well field, we measured short-time variations of six groundwater variables (water table, oxygen concentration, pH, redox potential, temperature, and conductivity) relative to floods and pumping. Data were collected every 15 minutes from a well located about 50 metres between the river and a nearby production well. All factors varied significantly during sampling period. Flood decreased pH and increased temperature, conductivity and oxygen. Changes of surface water level influenced groundwater quality with a 2-day time-lag. The same variation was related with pumping in the nearest well with about 2-hour time-lag. When pumping was added to flood, the time-lag of groundwater chemistry changes was reduced from 1–2 days to 2 hours. Large changes of groundwater chemistry might cause changes of biological activity in aquifers.
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