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

黒岩 知恵 平松 晋也

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌

巻号頁・発行日

vol.63, no.4, pp.16-21, 2010

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Many hillside landslides and debris flows occurred by typhoon T 0421 in Miyagawa village (the present Odai town) on September 29, 2004. These caused severe sediment-related disasters. In this study, several findings on the influence of precipitation, slope angle and forest practice on hillside landslides caused by typhoon T 0421 were shown in Miyagawa-dam basin as follows : 1) Correlation between precipitation and collapsed area ratio was not clear. 2) Angle of collapsed slope in deforestation sites was 5-10° lower than those of non-forestation and reforestation sites. 3) Collapsed area in deforestation sites occupied 57% in total collapsed area. 4) Most of landslides were occurred since 10 to 20 years after deforestation. 5) More hillside landslides observed in larger deforestation area. 6) A prediction model of slope stability changes considering forest practice (Kuroiwa and Hiramatsu, 2004) was applicable to Miyagawa-dam basin. As the result of this simulation, collapsed area is generally in proportion to collapsing possibility area ratio index (APhr(t)). 7) Angle of collapsed slope and APhr(t)and collapsed area ratio showed significant correlation.

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

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

著者

井口 正一

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.51, no.2, pp.45-52, 1998-07-15 (Released:2010-04-30)

参考文献数

4

著者

南里 智之 槇納 智裕 米川 康 原田 憲邦 安藤 裕志 山田 孝

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.60, no.5, pp.23-30, 2008-01-15 (Released:2010-04-30)

参考文献数

24

被引用文献数

2

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A volcanic mudflow chronology spanning the past 40, 000 years was developed for the Furano River, which is located on the foot of Mt. Tokachi, using stratigraphic analysis, radiocarbon dating, dendrochronology and historical archives. Mt. Tokachi is one of the most active volcanoes in Japan, and its volcanic eruptions have often caused large-scale mudflows like the 1926 event that caused 144 deaths along the Furano and Biei Rivers. To develop local programs for preventing volcanic disasters, knowledge of past disasters accompanied with volcanic mudflow chronologies are required. We have identified 14 total mudflows during the past 40, 000 years that occurred along the Furano River, including events in A.D. 1926, AD. 1857, AD. 1740, A.D. 1150-1690, A.D. 600-900, 1, 900 YBP, two in 2, 000-2, 300 YBP, 3, 200 YBP, 3, 500 YBP, 3, 700 YBP, 7, 500 YBP, 13, 500 YBP, and 39, 000 YBP. Some of them were also crosschecked with historical archives. Of the fourteen mudflows, a total of 11 occurred during the past 4, 000 years, and 8 occurred during the past 2, 000 years. These high-frequency mudflows aggraded the valley channel and riverbed to the elevation of Kami-Furano City's central part, which was not damaged by the 1926 mudflow. Therefore, the next mudflow will easily reach the city's center and increase overall damage. It is generally suggested that the frequency and magnitude of volcanic mudflows will work synergistically in increasing the risk of sediment disasters.

著者

桐山 貴俊

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:21874654)

巻号頁・発行日

vol.68, no.3, pp.43-46, 2015-09-15 (Released:2017-03-21)