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Volume 47 (1994 - 199･･･
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Volume 47, Issue 3
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1994 Volume 47 Issue 3 Pages 1-2
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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Yoichi OKURA, Toshiaki SAMMORI, Hirotaka OCHIAI1994 Volume 47 Issue 3 Pages 3-10
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe movement of debris within a landslide was simulated using 2-dimensional DEM(Distinct Element Method) . The movement is simulated from landslide initiation to final deposition. The DEM simulation analyzed the motion of a mass of 354 particles(elements) for a slope length of 5. 35 m, depth of 0. 4 m, and a gradient of 35°. These results were compared with laboratory experiment of the same size. The Young's modulus for the particles is presumed from convergence of the calculation. Friction coefficient of the particle is assumed to be the same as internal friction angle measured in sandy soil by shear test(φ′=30.4°) . The movement of individual particles, (i. e., collision, rotation, and sliding) was calculated according to Newton's second law of motion every 1/20, 000 second in DEM.
The conclusion of the simulation, results agreed well with particle movements measured in laboratory experiment. From initiation to end, loci of particles and also calculated cross-sectional profiles of deposited particles were similar to those from the experiment.View full abstractDownload PDF (899K) -
Guogiang OU, Yoshiharu ISHIKAWA, Akihiro MAEDA, Shinichi KUSANO1994 Volume 47 Issue 3 Pages 11-17
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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Shinji YOSHIZAKI, Hiroshi MURAI, Akira KOTO1994 Volume 47 Issue 3 Pages 18-25
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is important to control the aeorian sand transport for preventing the damage of road and agricultrual land in the inland desert of the United Arab Emirates.
This paper aims at clarifing the features of drifting sand and the transformation of sand dune in order to find out the procedure of control.
The results obtained are as follows.
1) Although the sand grains on the dune crest and in the surface layer of sandy bare land have median size of 0. 20 mm, size distribution characteristics differed from each other. Because the latter is more uniform, it should be consisted by the sand drift from the dune.
2) One half and more of annual sand drift could be related to the sand-storms before rainfalls, whose opportunities are not so many, indeed. This should be a feature to be considered before making good efforts for sand control.
3) Regression analysis of sand drift collected and wind speed yielded the annual rate of 11. 11 and 0. 23 ton per unit width in meter for the dune crest and the sandy bare land, respectively.
4) The linear dunes in this resion would be transformed by dominant wind which is bidirectional and incident the crest line at acute angle.View full abstractDownload PDF (7478K) -
Takahisa MIZUYAMA1994 Volume 47 Issue 3 Pages 26-29
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe progress of erosion control works has been expressed in terms of the percentage of area or number of treated landslides. But, then how is the effect of erosion control works evaluated? A method utilizing the turbidity of streams is proposed to evaluate the effects of control works in this paper. Ohtaki river was selected as an example since a large-scale debris avalanche occurred there in September 1984.
Turbidity was measured three times each year at Makio reservoir located downstream of the debris avalanche. A proportional coefficient was used as the index of the devastation, assuming that the turbidity is proportional to flow discharge. The coefficient increased by more than ten times following the debris avalanche. It decreased sharply for the first two years, and then decreased gradually. The value of the coefficient returned to the same value as before the debris avalanche several years after the debris avalanche. The coefficient exhibits a close relationship with the progress of erosion control works, that is, hillside works and construction of check dams. Therefore, turbidity or sediment concentration can be used to express the degree of devastation or to evaluate erosion control works.View full abstractDownload PDF (2930K) -
BY Y. SAKATANI, Ir. Agus SUMARYONO1994 Volume 47 Issue 3 Pages 30-32
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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[in Japanese], [in Japanese]1994 Volume 47 Issue 3 Pages 33-35
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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1994 Volume 47 Issue 3 Pages 36-49
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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[in Japanese]1994 Volume 47 Issue 3 Pages 50
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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[in Japanese], [in Japanese]1994 Volume 47 Issue 3 Pages 51
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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[in Japanese]1994 Volume 47 Issue 3 Pages 52-56_2
Published: September 15, 1994
Released on J-STAGE: April 30, 2010
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