Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 39, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • Nitrogen Isotope Ratio of Nitrate of Groundwater in Miyako Island, Okinawa Prefecture
    Hiromasa KONDO, Norio TASE, Tatemasa HIRATA
    1997 Volume 39 Issue 1 Pages 1-15
    Published: February 25, 1997
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.39.1
    JOURNAL FREE ACCESS
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    To investigate nitrate sources in the aquifer consisting of unconsolidated limestone, stable isotope of nitrogen (δ15N) was measured in shallow groundwater from wells and springs under three land-use settings. The typical land-use settings and corresponding average nitrate concentrations and δ15N values were : residental areas,7.1mg/L and 8.0‰; agricultural areas,7.2mg/L and 5.2‰; and natural, undeveloped areas,5.3mg/L and 5.6‰, respectively. Average 15N values of urine sewages and commercial inorganic fertilizers were 18.10‰ and 0.5‰, respectively. Values of δ15N greater than 7‰ in residental areas suggest that nitrogen from sewages exists in groundwater. Values of δ15N less than 7‰ in agricultural areas and a part of natural, undeveloped areas suggest that nitrogen in groundwater was supplied by commercial inorganic fertilizers. Low nitrate concentarations and low values of δ15N in residental areas were caused by dilution with groundwater influenced by commercial fertilizers flowing into residental areas. High δ15N values in agricultural areas suggested that denitrification occurred actively.
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  • Numerical Modeling of Transport and Cometabolic Degradation of Trichloroethylene in Groundwater
    Shunji OYA, Albert J. VALOCCHI, Tohru FURUICHI
    1997 Volume 39 Issue 1 Pages 17-31
    Published: February 25, 1997
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.39.17
    JOURNAL FREE ACCESS
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    A one-dimensional transport model for in situ bioremediation of a saturated aquifer contaminated by trichloroethylene (TCE) was developed. The model assumes that TCE is degraded by cometabolic transformation in the presence of mobile and immobile methanotrophic bacteria (methanotrophs) stimulated by the injection of methane and oxygen into the aquifer. Simulation results showed qualitative agreements with some of the experimental results reported by other researthers. Competitive inhibition between methane and TCE significantly affected the removal of TCE. The effect of sorption / desorption kinetics for TCE on the removal depends upon the limiting conditions in the system. The removal of TCE is substantially improved by changing the sorption / desorption characteristics, if sorption / desorption is a limiting process. Under the simulated conditions, microbial mobility exerted little influence on the TEC removal rate. These simulation results indicate that this model can provide useful information for understanding the phenomena during a remedial action and for improving the efficiency of TCE removal.
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 39 Issue 1 Pages 33-41
    Published: February 25, 1997
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.39.33
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 39 Issue 1 Pages 43-45
    Published: February 25, 1997
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.39.43
    JOURNAL FREE ACCESS
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  • Visit to Valuable Water Springs (36) Valuable Natural Water of Fukushima prefecture
    -Aizu and shirakawa area-
    Kunihide MIYAOKA, Yasuo SHIMANO
    1997 Volume 39 Issue 1 Pages 47-57_1
    Published: February 25, 1997
    Released on J-STAGE: December 11, 2012
    DOIhttps://doi.org/10.5917/jagh1987.39.47
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1997 Volume 39 Issue 1 Pages e1-
    Published: 1997
    Released on J-STAGE: December 14, 2012
    DOIhttps://doi.org/10.5917/jagh1987.39.e1
    JOURNAL FREE ACCESS
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