Journal of Rainwater Catchment Systems
Online ISSN : 2186-6228
Print ISSN : 1343-8646
ISSN-L : 1343-8646
Volume 9 , Issue 1
Showing 1-16 articles out of 16 articles from the selected issue
  • Type: Cover
    2003 Volume 9 Issue 1 Pages Cover1-
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages App1-
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages App2-
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages App3-
    Published: 2003
    Released: September 13, 2016
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  • Type: Index
    2003 Volume 9 Issue 1 Pages Toc1-
    Published: 2003
    Released: September 13, 2016
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  • Toshihiro Morii, Yuji Takeshita, Mitsuhiro Inoue
    Type: Article
    2003 Volume 9 Issue 1 Pages 1-6
    Published: 2003
    Released: September 13, 2016
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    An integrated procedure to determine hydraulic conductivity of sand sediment soil that is characterized by an inclusion of gravel particles and cobbles in sand soil is proposed. Firstly the Guelph pressure infiltrometer (GPI) method to measure the soil permeability of the sand is introduced and extended so that it can estimate unsaturated moisture properties of the soil. Secondly a descriptive cylindrical soil model representing sand, gravel and cobbles, and voids within soil is assumed to determine the hydraulic conductivity of the sand sediment soil. A continuity law of flow discharge through the cylindrical soil model is introduced to derive theoretically a functional relationship of the hydraulic conductivity of the sand sediment soil with the hydraulic conductivity of the sand measured by the GPI method and the gravel content of the soil. An accuracy of the functional relationship of the hydraulic conductivity is examined by laboratory permeability test. Finally the GPI method and the functional relationship of the hydraulic conductivity are integrated to determine the soil permeability of the sand sediment soil. A numerical example is given to show an effect of the gravel content of soil on a storm runoff over the sand sediment soil.
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  • Macanus Yangyuoru, Toshihiko Kawachi, Koichi Unami, Samuel G. K. Adiku ...
    Type: Article
    2003 Volume 9 Issue 1 Pages 7-12
    Published: 2003
    Released: September 13, 2016
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    The effects of variable seasonal rainfall, predicted supplementary irrigation, cultural practices (land-forms, tillage and weed management) and their interactions on the yields of maize and cowpea grown on the Vertisols in the Accra plains are examined. Based on long-term (27-years) seasonal daily rainfall data and the test crops maize and cowpea, transformation factors of 1.61 and 1.24 are obtained for the major and minor seasons, respectively. These are subsequently employed to obtain potential yields of the crops under supplementary irrigation. The potential yields of maize and cowpea given supplementary irrigation are significantly (p<0.00l) higher than those under rainfed conditions. Maize average yield under rainfed and supplementary irrigation conditions were 1.8 ton/ha and 2.9 ton/ha, respectively, and the average yields of cowpea are 0.33 ton/ha and 0.40 ton/ha, respectively. The effects of supplementary irrigation, cultural practices and the treatments interactions also give significantly (p<0.00l) higher yields of maize and cowpea than under rainfed conditions. In seasons with normal or above-average rainfall, camber beds are more productive than flat plots. However, when the seasonal rainfall is low, flat plots are more suitable than camber beds for crop production. The maximum maize and cowpea yields on tilled plots under irrigation are 4.0 ton/ha and 0.66 ton/ha, respectively. The best maize and cowpea yields as influenced by weed and water management are 5.2 ton/ha and 0.74 ton/ha, respectively.
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  • Kun-Woo Chun, Jung-Il Seo, Kyu-Jin Yeom, Du-Song Cha, Kyoung-Nam Kim, ...
    Type: Article
    2003 Volume 9 Issue 1 Pages 13-17
    Published: 2003
    Released: September 13, 2016
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    This study was carried out to investigate the effect of the coverage and the afforestation on the suspended solid and the sediment yield in a forested area burnt in Kangwon, Korea in 2000. Lysimeters were installed in T-l (supplementary plantation), T-2 and T-3 (naturally restored forests), P-1 (artificial plantation), P-2 (plantation for timber production) and C-0 (control plot) to measure the suspended solid and the sediment yield after rainfall. Suspended solid and sediment yield are affected by the coverage and the afforestation, and increase in proportion to rainfall. Consequently, the coverage and the afforestation in the forest fire area have an effect on the suspended solid and the sediment yield, and the second disaster will occur, if there are no erosion control works. Therefore, the environmentally favoring erosion control works are necessary.
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  • Masaharu Ohkado, Satoshi Oke, Kunihiko Kitamura
    Type: Article
    2003 Volume 9 Issue 1 Pages 19-24
    Published: 2003
    Released: September 13, 2016
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    A machine for direct seeding into water-filled soil using seed-burying wheel, developed by Nakamura et al, is currently available for paddy rice cultivation. This study is associated with experimental investigations of water management after seeding using this direct seeding machine. In the indoor experiments using a tray any conspicuous, improvement in budding or in growth of seedlings was not found even if water-filling was delayed after seeding. Furthermore, it was found that without water-filling, the ground temperature around the seed was lower than that with water-filling. This is unfavorable to budding and growth of seedlings. During a three-year seeding test with an operational prototype, excellent budding was obtained by adopting the method of water-filling one day after seeding; the rate of satisfactory growth of seedlings was then 70% or more. To popularize paddy rice cultivation with direct seeding into water-filled soil, it is necessary to reduce, to the extent possible, the degree of dependence on farmer skill by following a work process similar to that of actual transplanting culture, so as to reduce the burden on farmers. Therefore, we are recommending early water-filling after seeding by the direct seeding machine.
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  • Yamato Nara, Masaki Saito, Hitone Inagaki, Takefumi Nakazono, Yasuhiro ...
    Type: Article
    2003 Volume 9 Issue 1 Pages 25-36
    Published: 2003
    Released: September 13, 2016
    JOURNALS FREE ACCESS
    In the conventional pipeline design, it is supposed that measures which prevent the occurrence of water column separations must be taken, and that the low pressure below the saturation pressure of water vapor must not occur over the whole region of the pipeline. If the occurrence point of water column separations and its influence on the pipeline can be accurately estimated, we can adopt the optimal design, which may permit the occurrence of water column separations, for each pipeline. For appropriate estimation of pressure change causing water column separations, the authors propose air cavity model. Air cavity model can deal with change of elastic wave velocity at the point of water column separation sing predicable parameters. As a result of the waterhammer analysis on a l000m-long pumping pipeline by the characteristic method with air cavity model, it is clarified that water column separation may not necessarily cause high pressure that damages a pipeline system without any waterhammer prevention device.
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  • Kazumi Mabuchi, Ken Hiramatsu, Hiroshi Itagaki
    Type: Article
    2003 Volume 9 Issue 1 Pages 37-42
    Published: 2003
    Released: September 13, 2016
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    The terrace type fisliway is a hybrid fishway of the pooi type and the stream type, which has been developed and constructed at a groundsill of River Neo in 2000 by the Upper-Kisogawa construction bureau of the Japanese government and Yamatatsu Construction Company where one of the authors is working. The terrace type fishway is named for its shape that resembles a terrace paddy in a mountainous area. This fishway is equipped with several devices; a) There are many slits on the walls that are surrounding the pools, because the walls are made of the fieldstones around the groundsill. The fishes can pass through the slits without jumping. b) The mouth of the fishway opens widely for fishes to find their routes easily. In addition, the slope for the lateral direction is set steeper than that for the stream direction to gather the river water along the walls, which assures the minimum water depth required for passing even in the drought period. c) The depth of the pools is shallow enough to flush the soil and sands during the flood, which makes the fishway maintenance-free. d) The roughness with small rocks on the slits and bottom of the pool effectively reduces the velocity in the fishway. e) The rapid velocity at the upstream mouth of fishway is reduced by raising the position of the mouth. The hydraulic characteristics and effectiveness of the fishway from the viewpoint of passage of the aquatic habitats are examined by the follow-up surveys during these 3 years. As a result, it proves that the terrace type fishway can be an alternative to the conventional ones and further it is superior to them in many aspects.
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages 43-44
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages 45-46
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages 46-
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages 47-48
    Published: 2003
    Released: September 13, 2016
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  • Type: Appendix
    2003 Volume 9 Issue 1 Pages 49-
    Published: 2003
    Released: September 13, 2016
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