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Volume 21 (2008)
- Issue 6 Pages 414-
- Issue 5 Pages 353-
- Issue 4 Pages 273-
- Issue 3 Pages 195-
- Issue 2 Pages 100-
- Issue 1 Pages 12-
Volume 21, Issue 5
Displaying 1-3 of 3 articles from this issue
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Original research article
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Junzo SAGOArticle type: Original Article
2008 Volume 21 Issue 5 Pages 353-360
Published: September 05, 2008
Released on J-STAGE: December 04, 2008
JOURNAL FREE ACCESSIt is essential to examine uncertainty of hydrological value comprehensively for improving river planning and river management. Consequently, I estimated the error of each hydrological data and the propagation error using relative error as evaluation index. As a result, It was evaluated that discharge calculated from rain data has error of 25 %, and the biggest factor of the error is runoff ratio and the error is 19 %. In addition, It was recommended that reliability analysis should apply to flood control plan to reflect uncertainty of hydrological value.View full abstractDownload PDF (507K)
Technical note
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Toshitsugu MOROIZUMI, Masahiro IKEMOTO, Hiromasa HAMADA, Somsak SUKCHA ...Article type: Technical note
2008 Volume 21 Issue 5 Pages 361-367
Published: September 05, 2008
Released on J-STAGE: December 04, 2008
JOURNAL FREE ACCESSThe soil water content was measured using a Profile Probe PR1 soil moisture sensor (Delta-T Devices, Ltd.) to develop water resources in rain-fed land with paddies and sloping fields in Northeast Thailand. The PR1 sensor uses a kind of amplitude domain reflectometry (ADR) as its measuring technique. In order to determine the soil water content with the PR1, it is necessary to establish specific calibration equations between the output voltage of the PR1 and the measured values of the soil water content. The objectives of this study were to present an in situ calibration of the PR1 and to measure the soil water content in the above-mentioned rain-fed land. The in situ calibration makes it possible to measure the water content of undisturbed soil samples and does not require the adjustment of the soil water content. The calibration equations resulted in a Bolzmann function for loamy sand and a liner function for sandy clay. Changes in the soil water content below a depth of 60 cm, for both the rain-fed paddies and the sloping fields, were not very large, and the high soil water content was maintained for over a year. It was found that the rain-fed paddies stored more soil water than the sloping fields.View full abstractDownload PDF (974K)
Review article
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Tetsuya IKEDAArticle type: Review article
2008 Volume 21 Issue 5 Pages 368-377
Published: September 05, 2008
Released on J-STAGE: December 04, 2008
JOURNAL FREE ACCESSWhereas achieving rapid economic growth and improvement of social lives in recent years, China is facing with various types of water problems such as water-related disasters (ex. floods), water scarcity and water pollution. Among them, because of the population growth and unbalanced distribution of water resources by time and space due to its natural and climatic conditions, water resources problems in China are worried as serious restrictions on future sustainable growth and development. This study tries to reveal the current situation and problems of water resources in China, especially focusing on its capital, Beijing, and tries to assess the transboundary water transfer which is taken to solve such problems from the sustainable points of view. Furthermore, it tries to conduct the elementary study on water saving society project, which aims at enhancing effective use of regionally-limited water resources and tries to suggest the future courses of Integrated Water Resources Management for such countries, especially in the Asian region, as are expected to achieve further growth and development in the future.View full abstractDownload PDF (633K)
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