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Volume 14, Issue 1
Displaying 1-11 of 11 articles from this issue
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[in Japanese]2001 Volume 14 Issue 1 Pages 1-2
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
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Masahiko HASEBE, Takanori KUMEKAWA, Katsura KAWASHIMA, Tetsuya KURIYAM ...2001 Volume 14 Issue 1 Pages 3-12
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
JOURNAL FREE ACCESSIn this paper, at first, the amount of wet acid deposition (SO42-, NO3- and so on.) is investigated in Tochigi Prefecture. Secondly, saplings of two-year-old Cryptomeria japonica, Quercus serrata and Lithocarpus edulis planted on the soil added sulfuric acid are reared for 12 weeks and then the concentrations of Mg2+, Ca2+, K+, Al3+, Mn2+ in the soil are analyzed to clarify the relationship between each ion concentration and the process of the growth of each sapling. Consequently, the process of the growth of these saplings is lower according to increase of H+ added to the soil and these weights of dry growth fell down. This is suggested that these growths are much related with Al3+ and Mn2+ that are eluted from the soil particle below pH 4.View full abstractDownload PDF (7665K) -
Yasushi TSURUTA, Tadaharu ISHIKAWA, Shuzo NISHIDA, Hirokazu FUJIWARA, ...2001 Volume 14 Issue 1 Pages 13-26
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
JOURNAL FREE ACCESSBecause the salinity condition of a brackish lake is fluctuated by rather stochastic events of the seawater intrusion, topographic changes in the estuarial region, meteorological conditions, etc., a time series analysis of long-term hydraulic data is needed to estimate the range of the variations of lake water salinity. The purpose of this study is to restore long-term hydraulic data related to the seawater intrusion into Lake Ogawara in Aomori Prefecture, where some of important hydraulic factors have not been measured till quite recently or their measurements have been frequently interrupted by instrument troubles. The relationships among the hydraulic quantities, such as flow rate, water stages and tidal level, are evaluated and formulated based on physical interpretation, using a complete data set of the last two years. Some different ways to estimate missing data are constructed in order to deal with various combinations of available data, and the accuracy of estimation is examined for each method by reproducing the existing data. The data for the past 17 years were finally complemented. A comparison of the results by different ways gives the reliability of estimation.View full abstractDownload PDF (693K) -
Norio NAGAHAMA, Shinichi ONODERA, Masahiro KOBAYASHI, Yukihito ANDO, M ...2001 Volume 14 Issue 1 Pages 27-33
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
JOURNAL FREE ACCESSWe carried out a sprinkling experiment on the ridge of the burned granitic mountain covered by the water repellent soils. After the applied rainfall, we dug a trench and confirmed the location of the dye tracer. In addition, we measured the soil resistivities during the experiment and examined the infiltration processes. The results are summarized as follows, 1) The infiltration process was influenced by the water repellency at the ground surface. The widths of preferential flow paths were about 1cm. 2) The change in resistivities approximately corresponded to the changes in pressure head and the dye tracer. This result indicates utility of electrical exploration to estimation of infiltration process.View full abstractDownload PDF (6481K) -
Masahiro MURAKAMI2001 Volume 14 Issue 1 Pages 34-41
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
JOURNAL FREE ACCESSThe objective of this study is to identify the problems in the super global scale water resources development projects, of which the conceptual ideas and plans had been elaborated since 1900s, by taking into account the significant questions on the global environmental problems discussed after the Earth Summit in Rio de Janeiro in 1992. The super global projects were almost put-aside owing to the lack of careful attention of the adverse affect on the global environment including global warming and destruction of ecology and bio-diversity after the Earth Summit. In this study, the major problems in the super global scale water resources development projects are identified by comparing the following case studies: 1) Bering strait dam and Northeastern Siberia development, 2) River diversion scheme in north-western Russia and western Siberia, 3) Central Asia land development project and the crisis of Aral and Caspian seas, 4) Atlantropa project and the Congo river diversion to Sahara desert, and 5) Delta project in the Netherlands. The old agenda of large scale development is likely to be restructured by taking into account the new agenda of managing water resources with alternative strategies and policies.View full abstractDownload PDF (3145K) -
Raymond D. HART2001 Volume 14 Issue 1 Pages 42-62
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
JOURNAL FREE ACCESSThis paper is intended to compliment the two other papers, Water Resources Development and Management in California by David N. Kennedy and “Balancing Water Supply and Environmental Restoration, The CALFED Bay-Delta Program” (CALFED is a state and federal coalition of governmental resource management agencies and regulatory agencies that share overlapping responsibilities in the Sacramento-San Joaquin River Delta.) by Lester Snow, by presenting some of the basic geo graphic and hydrologic information on California's water use, future demand, and availability of water supply. After first describing the climate and hydrology, I will present information on California's urban, agricultural, and environmental water demand for 1995 and the 2020 forecast. Then I will present a discussion on water supplies and how California will meet its future water needs.View full abstractDownload PDF (17790K) -
Lester A. SNOW, Steven R. RICHIE2001 Volume 14 Issue 1 Pages 63-82
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
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[in Japanese]2001 Volume 14 Issue 1 Pages 83-89
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
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[in Japanese]2001 Volume 14 Issue 1 Pages 92
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
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2001 Volume 14 Issue 1 Pages 93
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
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2001 Volume 14 Issue 1 Pages 94-95
Published: January 05, 2001
Released on J-STAGE: October 22, 2009
JOURNAL FREE ACCESSDownload PDF (159K)
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