著者

大久保 駿 服部 泰英

出版者

公益社団法人 砂防学会

雑誌

新砂防 (ISSN:02868385)

巻号頁・発行日

vol.25, no.3, pp.10-19, 1973-01-20 (Released:2010-04-30)

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The Boso Penisula area suffered from big slope failure disasters caused by Typhoon No. 25 carring torrential rainfall in September 1971.Immediately after the disasters, we carried out the several investigations, that is, about the consciousness of residents for the slope failure, and the situations of slope failure using the ground investigation methods and the aerial photogrophic interpretation.In this paper, we report the characteristics of slope failure which io one part of informations we got.We classified the slope failure to 10 types taking note of geological and topographical conditions.All of them, typical failure is the sliding of top soils on the Narita layer (sand layer) and the sliding or falling of top soils or weathering layer on the bedrock in the tertiary area.The slope failures in the Narita layer area are apt to be dominated by something unusnal on the top of slopes and the location of mudstone layer lying between sand layer. The other hand, in tertiary area, the most inportant factors for slope failure are the locations of small valley on the slope and the dippression of surface plane on the mudstone layer.

著者

堀田 紀文 康 恰慧 執印 康裕 魏 聰輝 張 振生 陳 信雄 鈴木 雅一

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.58, no.1, pp.3-13, 2005-05-15 (Released:2010-04-30)

参考文献数

23

被引用文献数

2

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This study examined the relationship between slope failure and precipitation using long-term data for the Chitou tract, which is in the Experimental Forest of National Taiwan University, located 20 km south of the Chi-chi Earthquake epicenter. The University Forest maintains a variety of records that are a useful source of long-term data. Repair records for forestry roads, which assure long-term uniformity of temporal data owing to the high priority given to repairing forestry roads, were used to discuss the characteristics of slope failure. The relationship before and after the earthquake was compared to clarify the indirect influence of the Chi-chi Earthquake on subsequent slope failures. As a result, we showed that the earthquake affected subsequent slope failures, although the earthquake itself caused no slope failures directly when it happened on 21 September 1999. After the earthquake, the first slope failure was triggered by a precipitation event involving 91.5 mm of rain over 5 days in February 2000. By contrast, the smallest precipitation event that triggered slope failure before the earthquake was 210.5 mm over 5 days. In July 2001, the second slope failure event following the earthquake set a record for the most slope failures in the history of the Chitou tract. By the time of the slope failure event in May 2002, the earthquake no longer had any notable influence.

著者

石井 靖雄 小山内 信智 岩波 英行

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.53, no.1, pp.56-58, 2000-05-15 (Released:2010-04-30)

参考文献数

5

著者

堀 勇雄 池田 敦 橋本 好文 小林 元男

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.58, no.1, pp.54-58, 2005-05-15 (Released:2010-04-30)

被引用文献数

1

著者

鈴木 雅一

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.59, no.4, pp.43-47, 2006-11-15 (Released:2010-04-30)

参考文献数

12

著者

土居 寛幸

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.69, no.1, pp.42-47, 2016-05-15 (Released:2017-09-29)

参考文献数

10

著者

池谷 浩

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.29, no.4, pp.24-28, 1977-05-15 (Released:2010-04-30)

参考文献数

8

著者

高橋 透 松岡 充宏 瀬尾 克美 荒木 義則 古川 浩平 水山 高久

出版者

砂防学会誌

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.53, no.1, pp.35-46, 2000

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It is important to predict occurring place and time of debris flow by the way of researching rainfall and morphological data. This study was carried out on the basis of investigation of hazard literature and inquiry of them to the competent firehouse, etc. Forecast model of debris flow's occurrence was created by the method of multiple discriminant analysis of geographical and rainfall factors. This model could give an effective warning and evacuation line for every debris flow with occurring potential in hazardous torrents. As a result of this research, it was shown that the precision of the predict of debris flow's occurrence by this method was higher than the standard one by only rainfall factor.

著者

鈴木 拓郎 堀田 紀文

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.68, no.1, pp.13-24, 2015

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<p>The shallow water equations are generally used for numerical simulation of debris flows. In this method, the distributions of the flow velocity <i>u </i>and sediment concentration <i>c </i>are vertically averaged. Therefore, the calculation may be inaccurate when the upper and lower layers have different flow directions, as with countergradient flows. We propose a numerical simulation method for calculating the vertical distributions of <i>u </i>and <i>c </i>in debris flows. Our method is based on the moving particle semi-implicit (MPS) method, which was originally used for incompressible viscous fluid flows with free surfaces. Some modifications are necessary to adapt the method for debris flows. We introduce the constitutive equations of Egashira et al. to the MPS method. In Egashira's equations, debris flows are treated as a continuum. Thus, the proportion of gravel in a debris flow is expressed using the variable <i>c</i>. Similarly, each particle has an associated <i>c </i>value in our modified MPS method. In Egashira's sediment concentration equations, the equilibrium vertical distribution of <i>c </i>is obtained by integrating the rate of change of <i>c </i>in the vertical direction from the riverbed. In our method, <i>c </i>values spread among nearby particles, in order to reduce the difference between the equilibrium rate of change <i>c </i>and the actual rate of change of <i>c</i>. Numerical simulations of debris flow are performed. In the equilibrium condition, there is good agreement with the vertical distributions of <i>u </i>and <i>c </i>and those derived from the constitutive equations. In the condition where the riverbed gradient becomes less steep, there is good agreement with experimental results with a very short relaxation time, including those involving the formation of a convex upward deposition shape in the initial deposition process. Results for the initial deposition process are not produced with existing simulation methods that are based on the assumption of local equilibrium of average sediment concentration. However, simulations with a very short relaxation time show that local equilibrium is established as well as in existing methods. This indicates that the assumption of local equilibrium of sediment concentration is correct, and that because it evaluates the local equilibrium of each particle, our model can yield good results.</p>

著者

池谷 浩 石川 芳治

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.45, no.3, pp.52-56_2, 1992-09-15 (Released:2010-04-30)

参考文献数

3

著者

武居 有恒

出版者

砂防学会誌

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.28, pp.1-4_2, 1976

著者

山下 祐一 石川 芳治

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.44, no.2, pp.22-25, 1991-07-25 (Released:2010-04-30)

参考文献数

13

著者

西本 晴男

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.59, no.1, pp.39-48, 2006-05-15 (Released:2010-04-30)

参考文献数

72

被引用文献数

2

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Debris flow had been called in the various ways in Japanese, such as “Yama-tsunami”, “Yama-shio”, “Oshidashi”, or “Teppou-mizu”. This paper shows how the debris flow has been called academically, administratively, linguistically, or in journalistic ways. There are differences in transitions in the expressions of debris flow between academic, administrative, linguistic or journalistic ways. For example, “Doseki-ryu” was firstly used in the textbook of the Sabo engineering in 1916, while newspapers generally began to use “Doseki-ryu” in mid-1970 s. Until mid-1970 s, they used “Yama-tsunami” or “Teppou-mizu”. These transitions were executed with regard to the historical and social backgrounds.Here I also examined the origin of “Doseki-ryu” using literatures of France and Austria, because these countries had already done many studies about debris flow in 19th century. Based on these investigations, it can be thought that “Doseki-ryu” was composed by combining “doseki (stones and soils)” and “ryu (flow)”. While, other terms, like “Yama -tsunami”, are metaphoric expressions, “Doseki-ryu” can be considered to be very reasonable technical term, in terms of situation of occurrence, flow materials, behaviors of flow and linguistics.

著者

廣井 脩

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.51, no.5, pp.64-71, 1999-01-15 (Released:2010-04-30)

参考文献数

4

被引用文献数

2

著者

水山 高久

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.70, no.2, pp.76, 2017-07-15 (Released:2018-07-17)

著者

谷 勲

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.29, no.4, pp.29-38, 1977-05-15 (Released:2010-04-30)

参考文献数

4

著者

谷口 房一 小川 恒一 水山 高久 藤田 正治 小杉 賢一郎 扇 行徳

出版者

砂防学会

雑誌

砂防学会誌 : 新砂防 = Journal of the Japan Society of Erosion Control Engineering (ISSN:02868385)

巻号頁・発行日

vol.52, no.2, pp.27-30, 1999-07-15

参考文献数

4

被引用文献数

3

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Typhoon 7 hit Honshu on September 22, 1998. This storm brought about a certain amount of local damage in the path of the typhoon. Trees in the southern part of Nara Prefecture were blown down. Field survey and analysis of aerial photographs taken after the storm were carried out to determine some of the characeteristics of the trees blown down. Along narrow gorges the blown down trees on the steep slopes lay scattered in the direction of the downward grade. The blown down trees on slopes in the open areas lay in the same direction as the blast of the wind.The most trees blown down entirely from their roots and a few trees were broken at the middle of their trunks. The structure that check the outflow of the downed trees and the incidental landslides or debris flow sediment was proposed to be built from the logs of rather large diameters available at the sites.

著者

小田 晃 大野 宏之 本郷 國男 小川 淳一 浅野 広樹

出版者

社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.52, no.6, pp.32-37, 2000

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The hydraulic model experiment is used often to make the design of Sabo works. But reports to confirm the reliability of the hydraulic model experiment are not so much. Because the plan flood occurrence is rare in the field.<br>In this report, the hyetograph and the maximum rainfall in September 15-16, 1998 at Uono river were compared with the plan. And the peak discharge during this flood was guessed by the maximum rainfall and the catchment area around Uono river. Those were shown to almost equal the plan from this study.<br>The hyerograph was guessed from data of water level on Oogawara gaging station at the confluence of Daigenta river and Uono river during this flood. And the disaster occurrence time and location during this flood were compared with the experiment results under the same arrangement condition of Sabo facilities. The trend of those coincided with the experiment results.<br>We compared the flood scale and flood situation of field with the plan flood and the experiment results. Those in the field almost equaled the plan and the experiment. And it was shown that the hydraulic model experiment was useful to make the design of Sabo works from this report.

著者

中川 達也 荒木 孝宏 三輪 賢志 石井 靖雄 小川 紀一朗 千葉 達朗 佐野 寿聰

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.62, no.2, pp.56-59, 2009-07-15 (Released:2014-02-01)

参考文献数

8

著者

石黒 達也

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.51, no.1, pp.55-59, 1998-05-15 (Released:2010-04-30)

参考文献数

6