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Volume 41 (2000 - 200･･･
- Issue 6 Pages 323-
- Issue 5 Pages 256-
- Issue 4 Pages 200-
- Issue 3 Pages 126-
- Issue 2 Pages 70-
- Issue 1 Pages 2-
Volume 41, Issue 5
Displaying 1-5 of 5 articles from this issue
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Atsushi UCHIDA, Keinosuke GOTOH, Toru KAWACHI, Kensuke GOTO2000 Volume 41 Issue 5 Pages 256-266
Published: December 10, 2000
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSA map is the major tool in measuring fractal dimension of a river line whereas in this paper satellite remote sensing data were used in conjunction with the box-counting method. Satellite numeral data were of LANDSAT /MSS, LANDSAT/TM and SPOT/HRV. Some rivers in the northern part of Kyusyu district, Japan were treated with, fractal dimensions of which were measured by using not only each satellite numeral data but a combination of two or three kinds of satellite numeral data. Furthermore a change of Shoka river in China for floods were measured by fractal theory. The following conclusions were obtained: (1) Fractal dimensions of objected rivers had valuesclose to 1.0 showing that the river lines were not so complex. (2) There was little difference in fractal dimension between by use of each satellite numeral data and a combination of two or three kinds of satellite numeral data. (3) Satellite numeral data were clarified to be very useful in measurement of fractal dimension of river lines. (4) A spread of a river width by floods were measured by fractal dimension using satellite numeral data.View full abstractDownload PDF (5515K) -
Shoji UENO2000 Volume 41 Issue 5 Pages 267-278
Published: December 10, 2000
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSLandslides in the Izumi Group are usually caused by rainfall as well as by excavations such as open cuttings. Some of the landslides with clear morphology, however, are in stable over a long period of time. In this paper, we investigate two types of landslides including seven unstable cases and three stable cases. Then, the characteristics of the landslides in the Izumi Group are discussed.
The stability of the landslides is basically dependent on two angles. One is the angle of slip surface of the landslides, and the other is the average angle of the ground surface. It is shown that the stability of the landslide is higher if the two angles are less than 22 degrees. It is also shown that the landslide may slide along a small fault or a layered fracture zone for a dip slope, whereas for an opposite slope, the sliding may occur in a weak zone in which creep was fully developed over a long period. Consequently, the landslides are concentrated on the neighborhood of the Median Tectonic Line because large tectonic movements have taken place in this region. In addition, the stability of the landslides is strongly affected by groundwater. The infiltration of surface water into an opening crack may generate sufficient pressure of water to induce a landslide to slide.View full abstractDownload PDF (2127K) -
Tadao IMAI, Fumio SUGIMOTO, Shigeru YAMASHITA, Tomoyuki HIGUCHI, Mitsu ...2000 Volume 41 Issue 5 Pages 279-285
Published: December 10, 2000
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe purpose of this study is to explain the mechanism of physical deterioration process of granite. The physical weathering process of granite was modeled by fracture due to heating. The relationship between heating temperature and the mechanical properties were examined and subsequent growth of crack due to heating was observed with a microscope.
Results obtained from this study shows that granite is deteriorated physically by the growth of micro cracks. The growth of these cracks was observed to be in three distinct stages. Crack is initiated within the intracrystalline, this is then proceeded by intracrystalline crack or grain-boundary crack and finally, intercrystalline cracks were observed. Elastic wave velocity of the granite decreases by the growth of micro-crack. However, the growth of micro crack does not affect the compressive strength of the granite. Furthermore, ratio of dynamic and static Young's modulus decreases by physical deterioration.View full abstractDownload PDF (1811K) -
Hidefumi SAKAMOTO, Fumitoshi HIROWATARI, Rokuro HIROSE2000 Volume 41 Issue 5 Pages 286-292
Published: December 10, 2000
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSMost of groundwater in Japan is found in the multi-layered aquifer of Quaternary sediments. It is, therefore, necessary to make drilling of several observation wells in order to determine the essential hydrauric properties of groundwater in each aquifer.
We report here a new pumping method and its equipment of multi-layered groundwater by using a single observation well. This method is divided into the following three steps based on operating proceess.
1) Investigation by using a test boring : (a) identification of sub surface geological features. (b) determination of depth and thickness of each aquifer. (c) making a geological columnar section.
2) Drilling of an observation well and installation of a strainer pipe unit : (a) enlargement of the test boring from 66mm to 115 in diameter. (b) installation of the strainer pipe unit into the observation well. (c) drainage of the strainer pipe unit.
3) Pumpage of groundwater in each aquifer with a water-sampler unit (a) insert of the water-sampler unit into the strainer pipe unit. (b) pumping of groundwater and testing of water quality
The pumping method was tested at Mituhasi area, Fukuoka Pref. The sediments in this area are composed mainly of unconsolidated clay, sand, and gravel beds of Holocene age, and four aquifers has been confirmed by a single observation well. From the results obtained, it has been made clear that this method is the most effective pumping procedure.View full abstractDownload PDF (1199K) -
Ming ZHANG, Manabu TAKAHASHI, Hidenori ENDO2000 Volume 41 Issue 5 Pages 293-303
Published: December 10, 2000
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (1868K)
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