Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 56, Issue 3
Displaying 1-7 of 7 articles from this issue
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PREFACE
ORIGINAL PAPER
  • Study on groundwater salinization accompanied by the groundwater level recovery at coastal area
    －Case study in Arao City, Kumamoto－
    Masahiko ONO, Yudai MOTOTAKA, Jun SHIMADA, Takuma HASEGAWA, Kotaro NAK ...
    2014 Volume 56 Issue 3 Pages 189-208
    Published: August 30, 2014
    Released on J-STAGE: October 21, 2014
    DOIhttps://doi.org/10.5917/jagh.56.189
    JOURNAL FREE ACCESS
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    To reveal a process of groundwater salinization in Arao City, the groundwater level, water quality and groundwater age tracers are used. Groundwater salinization has occurred by the pumping up groundwater in the coal mine below Ariake Sea, and the recovery of groundwater level after closing down the mine. Salinized groundwater consists of two components. One is fresh groundwater which has recharged during 1930 to 1940. The other is saline water, which is originated from a diluvial formation below Ariake Sea and has recharged during 1972 to 1999.
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SPECIAL ISSUE
SPECIAL ISSUE TECHNICAL REPORTS
  • Application of mixed finite element method for various problems about groundwater flow
    Makoto ONO, Shunichi SUZUKI, Keisuke YAGI, Yuji IJIRI
    2014 Volume 56 Issue 3 Pages 213-224
    Published: August 30, 2014
    Released on J-STAGE: October 21, 2014
    DOIhttps://doi.org/10.5917/jagh.56.213
    JOURNAL FREE ACCESS
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    It is important for safety assessment of radioactive waste disposal facilities to simulate groundwater flow in heterogeneous fields accurately. In Europe and United States, studies for practical use of highly accurate analytical methods have been progressed more significantly than Japan. In our research of foreign papers, it is demonstrated that Mixed Finite Element methods, especially Discontinuous Galerkin Method (DGM) and Mixed-Hybrid Finite Element Method (MHFEM), are superior to existing methods such as Finite Element Method or Finite Volume Method. We have been developing the numerical simulation codes which are aimed to apply with mixed finite element methods.
    This paper shows a part of results of our survey, outlines of mixed finite element methods (DGM and MHFEM) and examples of our application of these methods for various problems.
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  • Three-dimensional finite elements by Raviart-Thomas mixed interpolation and their fundamental performance
    Hideyuki SAKURAI, Mitsuo GOHKE, Tomonari SHIRAISHI, Tomoyuki HISHIYA, ...
    2014 Volume 56 Issue 3 Pages 225-236
    Published: August 30, 2014
    Released on J-STAGE: October 21, 2014
    DOIhttps://doi.org/10.5917/jagh.56.225
    JOURNAL FREE ACCESS
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    This paper reports the fundamental performance in three-dimensional (3D) seepage problems of finite element methods (FEM) using the Raviart-Thomas mixed interpolant (RT), which is capable of independent interpolation of hydraulic head and velocity. In the conventional FEM that uses only hydraulic head as an unknown variable, velocity is independently calculated for each element. There are cases, therefore, where a continuous velocity field cannot be computed with high accuracy. In the RT, fluxes can be made continuous along inter-element boundaries because velocity shape functions employ the fluxes at the element faces as degrees of freedom. Although almost all of the previous studies have shown validity in 2D problems, this paper identifies the fundamental performance, including drawbacks, of the 3D elements with RT. The validity and significant notice of the FEM with RT in the engineering simulation is presented by getting its characteristic in order.
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TECHNICAL VISIT
CLASSIC & CONTEMPORARY PAPERS
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