Journal of Groundwater Hydrology
Online ISSN : 2185-5943
Print ISSN : 0913-4182
ISSN-L : 0913-4182
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Volume 52, Issue 1
Displaying 1-15 of 15 articles from this issue
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PREFACE
SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
  • Preface
    Tomochika TOKUNAGA
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 5-7
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.5
    JOURNAL FREE ACCESS
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  • Prospects for groundwater resources development and conservation in rural area
    Masayuki NAKAHARA, Masayuki IMAIZUMI, Jitsuya NAGATA
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 9-19
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.9
    JOURNAL FREE ACCESS
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    Ministry of Agriculture, Forestry and Fisheries has evaluated the available quantity of groundwater for agricultural use, based on the investigation for water resources development in the areas where enough water for irrigation purposes is not easy to be obtained. The use of groundwater for irrigation is around 6% of total agricultural use in Japan, but it is expected that dependence of the irrigation on groundwater may rise as the substitute of the river water if the quantity of water resources of river water decreases by climate change. As sustainable use of groundwater is expected to meet with the water demand in rural area in future, it is necessary to analyze and evaluate the potential of groundwater utilization quantitatively and objectively on the basis of correct information on the occurrence, water balance, and flow system of groundwater in each basin.
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  • Groundwater measures in the context of integrated water resources management
    Yoshikazu YAMAGUCHI
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 21-27
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.21
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    Japan is now facing water challenges caused by global scale climate problems. Climate change due to global warming will continue to have great impact on our water resources, which could result in instability in water availability. Because we recently have frequent droughts, we have learned to efficiently use and share our precious water, and we have developed various water technologies with a strong sense of thrift. Integrated water resources management must be explored as an instrument of constructive change in the scenario of sustainable water usage. In this paper, we introduce groundwater measures in the context of integrated water resources management.
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  • Policies of the Ministry of the Environment, Japan, for groundwater preservation
    Yuji KORESAWA
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 29-34
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.29
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    Groundwater has been utilized as a source of good quality water for many purposes including our daily use. However, groundwater is in hazard due to ground subsidence caused by the increase in pumpage rate of groundwater, water pollution by organochlorine such as trichloroethylene and nitrate, and the exhaustion of springs due to urbanization. In addition, the influences by the sea level rise due to climate change and by the change in precipitation become concerns for groundwater and ground environment in these days. This report introduces the current states of groundwater and ground environment in Japan, and the Ministry of the Environment's policies on their preservation and vision for the future.
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  • The management of land subsidence and groundwater conservation in Tokyo
    Hiroshi NAKAJIMA, Hiroshi KANEKO, Minoru TSUCHIDA
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 35-47
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.35
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    In Tokyo, land subsidence has occurred since about the beginning of Taishou Era, and has developed according to revival in the post-war days. The land subsidence became acceleated especially in the third and the fourth decade of Showa Era.
    For such a situation, Tokyo Metropolitan Government is positively working on managing groundwater in order to avoid land subsidence with such efforts as groundwater withdrawal management, groundwater level monitoring, and promotion of rain water infiltration, which are based on the laws and ordinances.
    As a result, land subsidence in Tokyo tends to remission, however, it has not ended. Moreover, the groundwater level is reaching the ceiling from the marginal rise to level-off. So there remains a possibility that land subsidence would relapse if the present withdrawal management is eased. Therefore, it is necessary to maintain the withdrawal management and to increase the amount of recharge to avoid future land subsidence.
    In this text, the situation and the management of land subsidence in Tokyo are retraced and future tasks are described.
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  • Administration for groundwater management in the Kumamoto area
    Issei OSHIMA
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 49-64
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.49
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    Kumamoto Prefecture is famous for its abundance of clear, good-tasting groundwater. As natural water resources many rivers, including the Kuma River, run through and there lie more than a thousand spring spots like those feeding the place around Suizenji and the Lake Ezuko. Though the population of Kumamoto area has long been dependent on groundwater among many water resources, problems are emerging recently concerning both quality and quantity of the water. Kumamoto Prefecture is now expecting sustainable utilization of groundwater for the future by comprehensively managing its quantity and quality in terms of the circulation of groundwater. The prefecture and 16 cities including Kumamoto City made the ‘First Plan for Comprehensive Control of Groundwater in the Kumamoto Area’ in March 1993, followed by its subsequent plan in September 2008. In accordance with them, a variety of measures have been taken in order to store more groundwater, reduce the total amount drawn and prevent the water deterioration. In this article, I mainly describe the contents of these two plans above for controlling the quality and quantity of groundwater in the Kumamoto area.
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  • The conservation and restoration policies for water source environment of Kanagawa Prefecture
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 65-73
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.65
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • A challenge for Saijo, a city of water
    Toward integrated local management of water resources
    Takatsugu SASAKI
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 75-77
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.75
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    In Saijo City (Ehime Pref.), people use good quality water called Uchinuki from artesian wells for daily life, and half of all households have their own domestic wells. All others are connected to the modern system of water supply system.
    This groundwater is pumped from a shallow aquifer that's depth is 20-50 meters, and people are worrying about pollution and quantity of groundwater. So its preservation is the most important task for municipal government.
    We have had many scientific tests of our groundwater, and now we have tried to develop a finer description of the flow of groundwater by using a hydrologic, hydraulic, and geochemical approach.
    The management and benefits of water-use in Saijo have been guided by the principle of so-yu, not kyo-yu.
    And we are trying to make this principle and unwritten social norms visible, and as groundwater is a public asset, we are trying to form the local ordinances for proper groundwater management.
    Fortunately, Saijo City has jurisdiction over its entire basin and using area. We will describe the engagements for Saijo, a city of water.
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  • State of groundwater management in Asia and future research agenda for groundwater management policy
    Yatsuka KATAOKA
    Article type: SPECIAL ISSUE FOR CELEBRATING 50TH ANNIVERSARY OF JAGH
    2010 Volume 52 Issue 1 Pages 79-86
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.79
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    Groundwater is an important water source for drinking, irrigation and social and economic development in cities especially in their early stage of development. However, depletion and pollution of groundwater resources are often reported in many places in the world as a result of overexploitation and inadequate management. Recognizing the importance of groundwater for sustainable development of Asia, Institute for Global Environmental Strategies (IGES) has been conducted a research on groundwater resource management focusing on the Asian cities. This article reports the state of groundwater and its issues based on the research IGES conducted and also introduces the future research agenda that IGES will tackle with.
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RESEARCH-IN-PROGRESS
  • Stable carbon isotope ratios (δ13C) in solvents of chlorinated volatile organic compounds (CVOCs)
    For clarification of natural attenuation in groundwater contamination by CVOCs
    Takeshi SAITO, Norio TASE, Maki TSUJIMURA, Teruyuki MARUOKA, Makoto NA ...
    Article type: RESEARCH-IN-PROGRESS
    2010 Volume 52 Issue 1 Pages 87-96
    Published: 2010
    Released on J-STAGE: February 01, 2012
    DOIhttps://doi.org/10.5917/jagh.52.87
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    An objective of the study was to clarify stable carbon isotope ratios (δ13C) in domestic solvents of chlorinated volatile organic compounds (CVOCs). Collection of domestic solvents (five compounds and twelve samples in total), development of preparation methods and measurement of domestic solvents were performed. As a result, it became clear to be able to measure δ13C in error of ±0.10-0.26‰ (n=2-5) for domestic solvents having boiling point of more than about 70°C. There were significant differences of δ13C between individual domestic solvents, and domestic solvents had very small range of δ13C in comparison with foreign solvents under the measurement performance. Evaluation of natural attenuation can be more effective, when compound specific isotope analysis (CSIA) is applied in Japan. Trichloroethene (TCE) and 1,1,1-Trichloroethane (1,1,1-TCA) can be more effective for evaluation of natural attenuation, when only domestic solvents are compared. Clarification of δ13C in domestic solvents is very useful to understand the groundwater contamination by CVOCs.
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