香東川扇状地における不圧地下水の水質の動態観測

概要

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Contamination of unconfined groundwater by nitrate nitrogen has been reported at several locations in the Takamatsu plain. To understand the mechanism and the extent of groundwater contamination, a target region in the plain was selected where the nitrate nitrogen has shown high concentration throughout the year. Intensive field measurement of groundwater level, EC, pH and the analysis of major ions in the groundwater were performed seven times in 2004 at twenty four shallow wells. The rate of stable isotope of nitrogen was also analyzed at two different seasons. The obtained data clarified that the nitrogen in the unconfined groundwater from the ground surface has been not only inorganic nitrogen but organic. It was also indicated that the fertilizer in the greenhouses for vegetables and waste water from a cow barn in the target area have been the major sources of the nitrogen.