著者

池田 暁彦 水山 高久 原口 勝則

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.3, pp.26-31, 2007-09-15 (Released:2010-04-30)

参考文献数

23

被引用文献数

1

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Debris flows occur when enough water supplied into materials on torrential streams. The occurrence criteria of debris flow has been evaluated with rainfall. However, the critical rainfalls triggering off debris flow may be differ by the supply process of water into materials. Material has been as riverbed deposit before the rainfall, or is supplied by slope failures and landslides during the rainfall. The authors selected Nishinogaito torrent for the test field, where debris flows has occurred frequently in these several years. The authors analyze the critical rainfalls based on the supply process of materials. In the Nishinogaito torrent, the material has been supplied before rainfall. Analyzing the accumulated rainfall within the time of concentration, it was estimated to be ten minutes and the critical rainfalls triggering debris flow in the Nishinogaito torrent was found to be 17 mm per ten minutes. From the result, we described a possibility to estimate the supply process of materials and or its occurrence process of debris flow from analyzing the critical rainfalls.

著者

海堀 正博 長谷川 祐治 山下 祐一 崎田 博史 中井 真司 桑田 志保 平松 晋也 地頭薗 隆 井良沢 道也 清水 収 今泉 文寿 中谷 加奈 柏原 佳明 加藤 誠章 鳥田 英司 平川 泰之 吉永 子規 田中 健路 林 拙郎

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.71, no.4, pp.49-60, 2018-11-15 (Released:2019-11-15)

参考文献数

10

被引用文献数

8

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In July 2018, heavy rain due to Typhoon Prapiroon affected western Japan and caused numerous sediment disasters such as landslides and debris flows in Hiroshima Prefecture. In a southern part of Hiroshima, approx. 8,500 slope failures occurred, and total number of sediment disasters were reported as approx. 1,250. Therefore, members of Japan Society of Erosion Control Engineering and Chuushikoku branch conducted field surveys in Hiroshima City, Aki Gun, Kure City, and Higashi-hirosima City. In Kawasumi area, Aki Gun, large rock which seemed to be core stone and diameter approx. 10 m moved down from the torrent, and at downstream side 6 m diameter rock seemed to hit the house with destructive power. In Aki-Gun, Saka-Cho, Koyaura area, one old stone masonry sabo dam was destroyed. We estimated the flow discharge from the investigation at the upstream of dam and considered the flow process from the flow traces around the dam. The results showed that the dam destroying process was as following. Firstly, the large rocks accumulated at the frontal part of debris flow collided and destroyed the right bank side wing, and then stone masonry product peeled off continuously. Furthermore, debris flows occurred from several streams in Koyaura and 1-1.5 m sediment deposition occurred at downstream residential area. In Higashihiroshima City Kurose-cho, many collapses and debris flows occurred around Hiroshima International University and there were no casualties fortunately. In Kurose-cho, most of the collapses seemed to occur from the top and ridge of the mountains with gentle slope around 15 degrees.

著者

沖村 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.63, no.4, pp.51-58, 2010-11-15 (Released:2014-11-01)

参考文献数

16

被引用文献数

1

著者

安江 朝光

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.2, pp.A3-A4, 1976-12-15 (Released:2010-04-30)

著者

三森 利昭

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.65, no.5, pp.1-2, 2013

著者

海堀 正博

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.78-81, 1999-01-15 (Released:2010-04-30)

参考文献数

2

著者

伊藤 彰彦

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.40, no.4, pp.37-39_2, 1987-11-20 (Released:2010-04-30)

参考文献数

14

著者

山内 修

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.39, no.4, pp.32-34_2, 1986-11-20 (Released:2010-04-30)

著者

嶋 丈示 松原 智生 石川 信隆 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.71, no.2, pp.3-12, 2018-07-15 (Released:2019-07-15)

参考文献数

15

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This paper presents an experimental evaluation method on the capture performance of debris flow by a steel open type Sabo dam (hereafter, steel open dam). First, the hydraulic tests for steel open dams are conducted to examine the outflow sediment, the capture height-time relation and the grain size distribution of outflow sediment by changing the riverbed slope and slit interval of dams. Herein, the capturing performance types by a steel open dam are proposed as the classification such as “complete blockage type”, “partial blockage type” and “control type”. It was found that the steel open dam with narrow slit interval showed “complete blockage type” which represents a good capture performance, regardless of riverbed slopes. It was also discovered that the capture height-time relation was a good measurement for the examination of capture process of debris flow. Second, the three different types of steel open dams in the most downstream are tested against three different scales of debris flow. It was confirmed that a new type steel open dam for the most downstream was proposed and showed good capture performance against different scales of debris flow.

著者

安田 勇次

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.63, no.4, pp.44-50, 2010-11-15 (Released:2014-11-01)

参考文献数

13

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.69, no.1, pp.57, 2016-05-15 (Released:2017-09-29)

著者

岡本 隆

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.56-60_2, 2006-05-15 (Released:2010-04-30)

参考文献数

3

著者

柴田 健一 鈴木 洋佑 今泉 文寿 早川 裕弌

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.64, no.2, pp.27-30, 2011-07-15 (Released:2015-02-02)

参考文献数

3

著者

山口 真司 小山内 信智

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.65, no.2, pp.40-50, 2012-07-15 (Released:2015-08-03)

参考文献数

22

被引用文献数

1

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