Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 51, Issue 4
Displaying 1-8 of 8 articles from this issue
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PREFACE
REVIEWS
PAPERS
  • Methodological studies for evaluation of groundwater flow system in a sedimentary rock area: Case study for the Boso Peninsula
    Ryutaro SAKAI, Masahiro MUNAKATA, Hideo KIMURA
    Article type: PAPER
    2009 Volume 51 Issue 4 Pages 311-329
    Published: 2009
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.51.311
    JOURNAL FREE ACCESS
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    The regional groundwater flow system of the Yoro River basin, Boso Peninsula in Chiba Pref. in Japan was analyzed using data on river flow rates, and water chemistry and hydrogen/oxygen stable isotope ratios of rivers, springs, and wells. The relationship between the groundwater flow system and the geological structure was inferred from the hydrogeological analysis, and the origin of groundwater discharge and flow-paths from the geochemical approach.
    The analysis indicated that a large part of the groundwater recharged at the highly permeable sand-dominant layer at high altitudes around the Daifuku Mt. flowing in the direction to strike of layers, and is discharged at the downstream basin as Ca-HCO3(SO4) type water. The rest of the Ca-HCO3(SO4) type water that recharged around the Daifuku Mt. is likely to flow into deep underground mixing with Na-HCO3 type water, and be discharged at the downstream basin through fractures of low permeability alteration layer.
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  • Long-term performance evaluation of permeable reactive barrier using zero-valent iron
    Makoto NAKASHIMA, Masanori NEGISHI
    Article type: PAPER
    2009 Volume 51 Issue 4 Pages 331-347
    Published: 2009
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.51.331
    JOURNAL FREE ACCESS
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    Long-term performance of a permeable reactive barrier (PRB) filled with zero-valent iron (ZVI) and crushed stone as reactive media was evaluated by about ten years groundwater monitoring from its installation. After 2619 days (about 7.2 years), increase of chlorinated volatile organic carbons (CVOCs) concentrations in groundwater was observed at down-gradient wells. Reactive media was sampled from the center of PRB at 3158 days (about 8.7 years) to conduct a series of laboratory tests, which examines the dechlorination coefficient and the conditions of iron powder. Test results showed the iron powder from PRB still maintains sufficient dechlorination ability of CVOCs, and the thickness of corrosion material ranges less than 5μm and the most of the metal portion remains. Therefore, it was considered that the PRB preserves its function to reduce CVOCs concentration in groundwater met the Environmental Quality Standards for Groundwater (EQSG) of Japan.
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RESEARCH-IN-PROGRESS
  • Simulation for the development of the continuous groundwater flow measurement technology
    Kaoru KOBAYASHI, Koki KUMAGAI, Ritsuko FUJIMA, Hiroshi CHIKAHISA
    Article type: RESEARCH-IN-PROGRESS
    2009 Volume 51 Issue 4 Pages 349-360
    Published: 2009
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.51.349
    JOURNAL FREE ACCESS
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    The flow of groundwater varies with time due to rainfall, atmospheric pressure change, tidal change, melting of snow during seasonal change, underground construction works etc. Therefore, to increase the precision of assessing in-situ groundwater flow characteristics, it is important to measure continuously the direction and velocity of the flow, in addition to obtaining accurate data for the afore mentioned environmental changes. The first part of this paper describes the development of a new device for measuring the direction and velocity of groundwater flow. The device was composed of a unique floating sensor with a hinge end at the bottom, which enabled continuous measurement of groundwater flow based on image data processing technique. In the second part, discussion is focused on clarifying the optimum cross-section shape and the behavior of the float sensor in saltwater and freshwater using numerical analysis.
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LECTURE NOTES
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