Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 51, Issue 1
Displaying 1-9 of 9 articles from this issue
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PREFACE
PAPERS
  • Influence of animal waste disposal pits on groundwater quality
    Seongwon LEE, Akiko HOSAKA, Norio TASE
    Article type: PAPER
    2009 Volume 51 Issue 1 Pages 3-14
    Published: 2009
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.51.3
    JOURNAL FREE ACCESS
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    Since the implementation of the Law on Promoting Proper Management and Use of Livestock Excreta in 1999, the number of the farmers that do not meet the management criteria is on the decline. However, there is a possibility that many of the animal waste disposal pits that have been either abandoned or refilled according to the law have been the potential contamination source. In this study, we discussed the impacts of the abandoned disposal pits to groundwater quality. The results showed that high concentrations of nitrate (above 100mg/L) were observed in the downstream of the disposal pits. It suggests that the abandoned animal waste disposal pits have been the potential pollution source even after the period of 15 years since the termination of use. Implementation of immediate countermeasure is necessary because the animal waste disposal pits are the long-term-sources of high levels of nitrate.
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  • Recharge sources and flow system of groundwaters in Osaka Basin, estimated from environmental isotopes and water chemistry
    Shinji NAKAYA, Muneki MITAMURA, Harue MASUDA, Kenji UESUGI, Yusuke MOT ...
    Article type: PAPER
    2009 Volume 51 Issue 1 Pages 15-41
    Published: 2009
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.51.15
    JOURNAL FREE ACCESS
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    Spatial distributions of stable isotopic ratios of oxygen and hydrogen, tritium concentrations, concentrations of nitrate-nitrogen and major water chemistry were investigated for the groundwaters shallower than -300m below sea level in the Osaka Basin in relation to groundwater tables, topography and hydrogeology to clarify the recharge sources and flow fields. The stable isotopic ratios of oxygen and hydrogen of groundwaters documented that groundwaters were recharged at the surrounding mountains, hills and plateaus of the Basin, and that the groundwaters transported nitric acids to -300m depth below the basin through aquifers. The flow velocities of recharge and migration through the aquifers are estimated roughly to be 2-9m/y and 0.1-1km/y in vertical and horizontal directions, respectively, in several recharge zones.
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