巻号一覧
前身誌
32 巻, 3 号
選択された号の論文の8件中1～8を表示しています
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太田 猛彦1980 年 32 巻 3 号 p. 1-8
発行日: 1980/03/10
公開日: 2010/04/30
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柵状構造物における流木の衝撃力と堰止め率水原 邦夫, 武居 有恒, 南 哲行1980 年 32 巻 3 号 p. 9-16
発行日: 1980/03/10
公開日: 2010/04/30
ジャーナル フリーThis paper describes the impulsive force and the rate of check of drifting woods at the stockade, as the second stage of a series of study on the check. In the former, the authors derive theoretically the expression relating to the value of p corresponding to the impulsive force and set up the safety section of the pier by expanding it. In the latter, the authors research experimentally on the effect of check of the stockade and make clear the mechanism of initial check of drifting woods and the relations between the rate of check and some relating factors.抄録全体を表示PDF形式でダウンロード (1011K) -
今村 遼平, 杉田 昌美1980 年 32 巻 3 号 p. 17-26
発行日: 1980/03/10
公開日: 2010/04/30
ジャーナル フリーA simulation model of debris depositing was built basing on the Random Walk Model. This is done on an alluvial fan consisting mainly of debris from the debris flows and traction. The purpose of this study is to forecast the deposit area of the debris.
This digital model consists mainly of the following three factors:
1. Calculation of the debris volume which will be supplied to a fan surface.
2. Debris deposits through debris flow.
3. Debris deposits through traction.
The Osawa Fan, located at th foot of Mt. Fuji and the fan along Katorea-sawa in Mt. Usu are the test fields in this study. According to the results of correlation, the debris flows using this simulation model resemble to the real flows. This suggests that the simulation model can be effectiue preventing the disastrous debris flowing, which is one of the serious problem in Japan.抄録全体を表示PDF形式でダウンロード (1678K) -
久保 田哲也, 水原 邦夫, 武居 有恒1980 年 32 巻 3 号 p. 27-36
発行日: 1980/03/10
公開日: 2010/04/30
ジャーナル フリーSabo-workes must treat steep mountain torrents, mudflow-deposit areas and so on. In such water-course many large gravels are scattered on the bed, and remove transforming the water surface. So, considering the critical conditions for traction of scattered gravels on a mountain stream bed, we should take account of the water surface effect.
In order to simplify the phenomena, mortar or glass spheres are adopted as the cobble-stones in this study and the experiments or the observations are carried out on condition that the single sphere is set in quasi-uniform flow on a wide rectangular channel bed. Besides, an applicable model of tractive mechanics are discussed, but this paper principally describes the critical conditions for a semi-submerged gravels.
Consequently, follows have gained.
1) The water surface effect i. e. wave front effect whicn means shift of fluid dynamic force acting point is one of the important factor in traction.
2) The effect of instantaneous fluid dynamic forces, in this case that of maximum fluid dynamic forces, is notable.
3) Two dimensional model of tractive mechanics is available in this study.
4) According to above model, the critical conditions for semi-submerged gravels on a steep channel bed are function of gradient, relative water depth, relative diameter, and of specific gravity.抄録全体を表示PDF形式でダウンロード (1209K) -
池谷 浩, 上原 信司1980 年 32 巻 3 号 p. 37-44
発行日: 1980/03/10
公開日: 2010/04/30
ジャーナル フリーNowadays it begins to design and construct slit sabo dam which has a slit on the crown of sabodam in the hope of sediment control in our country.
But, usual study does not evaluate the effect of sediment control by slit dam quantitatively.
Then, author studied about the effect of sediment control of slit dam by hydraulic experimentaltests, and made clear the such effect and some results mentioned as follows.
1) Blocking condition of a slit dam is shown as, b/dmax ≤1.5
2) Control effect in quantity of slit dams makes 1.2times of ordinary sabo dam in the boundarycondition of slit density, 0.2≤∑b/B≤0.6
3) Effect of slit dams which constructed continuousty 23 dams is not so effectual as a single.
4) Qualitative effect of slit dams is nearly equal to the effect of ordinary sabo dams.
As a result, effect of sediment control by slit dam makes a conclusion as follows
It is a useful effect that slit dam makes possible to flow down the sediment at ordinary time andto check the sediment at the big flood.抄録全体を表示PDF形式でダウンロード (1095K) -
豪雨によるがけ崩れ災害について仲野 公章, 石川 芳治1980 年 32 巻 3 号 p. 45-51
発行日: 1980/03/10
公開日: 2010/04/30
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砂防学会総務部1980 年 32 巻 3 号 p. 52-54
発行日: 1980/03/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (350K) -
大石 道夫1980 年 32 巻 3 号 p. A1-A3
発行日: 1980/03/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (6460K)
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