香東川扇状地における不圧地下水の水質の動態観測

水工学論文集 Volume 50 Page 277-282 published_at 2006-02
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Title ( jpn )
香東川扇状地における不圧地下水の水質の動態観測
Title ( eng )
Measurment and analysis of unconfined groundwater quality in the alluvial fan of Koto river
Creator
Hashimoto Michiko
Yoshikawa Seiko
Source Title
水工学論文集
Volume 50
Start Page 277
End Page 282
Abstract
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.
Keywords
nitrate nitrogen
unconfined groundwater
stable isotope of nitrogen
inorganic fertilizer
organic fertilizer
NDC
Construction. Civil engineering [ 510 ]
Language
jpn
Resource Type journal article
Publisher
土木学会
Date of Issued 2006-02
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 0916-7374
[NCID] AN10426673