著者

寺田 秀樹 仲野 公章 浅井 健一 山越 隆雄 金子 正則 石井 靖雄

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.53, no.3, pp.52-57_2, 2000

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An earthquake measuring 6.4 in Magnitude (M) on the Richter scale occurred at 16:02 on July 1, 2000, with an epicenter in the sea near Niijima and Kozushima Islands in the Izu island chain. It was followed by torrential rainfall caused by typhoon No.3 in July 7 and 8, and another earthquake measuring M 6.0 at 3:57 on July 9, with a hypocenter near the previous earthquake. They triggered many slope failures in Kozushima Island. The slope failures damaged some houses, and also produced a large amount of sediments on the beds of many streams.<br>In order to assess the risk of sediment-related disasters, the team of Erosion and Sediment Control Department in Public Works Research Institute has surveyed the state of slope failure deposits and erosion and sediment control facilities. The results of the surveys from July 4 to 6 and July 10 to 11 are as follows. 1) Slope failure sediments on the streambeds increase danger of debris flow disasters, because these streams have few erosion and sediment control facilities, except for Kozusawa. 2) Many slope failures and a few landslides were recognized in the surveyed area. Many of these failures occurred in the area of pyroclastic deposits. 3) The torrential rainfall by typhoon No.3 and the earthquake in July 9 widen the area of slope failure caused by the earthquake in July hand also caused new failures. It suggests that additional rainfall or earthquake will cause new failures and area extention of the failures which already occurred.

著者

渡辺 敞 徳山 久仁夫 中山 政一 二宮 寿男 大八 木俊治

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.31, no.3, pp.22-30, 1979

被引用文献数

2

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土石流災害から人命を守るための防災体制づくりの一環として,昭和50年台風5号時の仁淀川流域を調査し,警戒・避難基準雨量を設定する手法を検討した。<br>土石流発生時刻を現地で聞き取り調査し,降雨データと併せて発生時の目安雨量を定めた。豪雨時のモデル降雨をハイエトグラフを用いて設定し,土石流発生目安雨量に達する2時間前と1時間前の累加雨量をそれぞれ警戒と避難の警報を発する基準雨量とした。<br>その値を既往の豪雨に適用した場合の適合度を検討した。

著者

Hua-Yong CHEN Peng CUI Xiao-Qing CHEN JinBo TANG

出版者

社団法人 砂防学会

雑誌

International Journal of Erosion Control Engineering (ISSN:18826547)

巻号頁・発行日

vol.10, no.1, pp.9-15, 2017 (Released:2017-03-24)

参考文献数

19

被引用文献数

5

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In this article, experimental tests were conducted to study the characteristics of the surge wave and its effects on the failure process of a glacier dam. The results indicated that two obvious surges were monitored by pore pressure transducers (PPTs) when the blockage slid into water. The surge wave attenuated exponentially near the plunging location and then attenuated slowly when it propagated downstream. When the surge wave reached the glacier dam it climbed up along the dam and flew over. Sequential propagating surges exerting on the dam were one of the main factors causing the failure of the glacier dam. The failure mechanism of glacier dam triggered by the surge waves under different initial water supply conditions was primarily analyzed in this article.

著者

近野 英吉

出版者

社団法人 砂防学会

雑誌

新砂防 (ISSN:02868385)

巻号頁・発行日

vol.1948, no.2, pp.29-30, 1948-11-20 (Released:2010-08-06)

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

村野 義郎

出版者

社団法人 砂防学会

雑誌

新砂防 (ISSN:02868385)

巻号頁・発行日

vol.18, no.3, pp.14-23, 1965 (Released:2010-04-30)

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土石流の一例として, 大正15年5月24日の十勝岳爆発に伴って発生した土石流についての調査結果を報告する。この土石流については既に種々の立場から, 多数の報告が提出されているので, これらの文献調査, ならびに空中写真の判読, および現地調査などの結果を綜合することによって, その実態をかなり明らかにすることができた。また, 泥流に関する水路実験を行ってこの土石流の流量を推定し, かつこれを文献にしたがって検討した。

著者

Massimo ARATTANO Velio COVIELLO Claudia ABANCÓ Marcel HÜRLIMANN Brian W. McARDELL

出版者

社団法人 砂防学会

雑誌

International Journal of Erosion Control Engineering (ISSN:18826547)

巻号頁・発行日

vol.9, no.3, pp.114-121, 2016 (Released:2016-08-19)

参考文献数

20

被引用文献数

5

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The output of the seismic devices commonly employed for the monitoring of debris flows, such as geophones and seismometers, is a voltage that is directly proportional to the ground vibration velocity. The output signal in analogical form is usually digitalized at a fixed sampling frequency to be opportunely processed. The processing is performed to both reduce the amount of data to be stored in a data-logger and to reveal the main features of the phenomenon that are not immediately detectable in the raw signal, such as its main front, eventual subsequent surges, the wave form and so on. The processing also allows a better and sounder development of algorithms, when seismic devices are employed for warning purposes. However, the processing of the raw signal alters in different ways the original raw data, depending on the processing method adopted. This may consequently limit or reduce the efficacy of the warning. Different methods of data processing can be found in literature, each with its own advantages and shortcomings. In this paper we will explore and discuss the effects of some of these latter on the efficacy of the algorithms employed for warning, applying them to the seismic recordings obtained in the instrumented basins of Gadria (Italy), Rebaixader (Spain) and Illgraben (Switzerland).

著者

佐藤 創 長坂 有 浅井 達弘 寺澤 和彦

出版者

社団法人 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.58, no.6, pp.11-17, 2006-03-15

被引用文献数

4

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We quantified the woody debris on the flood plain of the Appetsu River, watershed area is 287.9 km², by Typhoon 0310, Etau. This typhoon caused heavy damage, especially in the Hidaka and Tokachi districts of Hokkaido. We established 61 study sites in the river basin and investigated the size, species, and freshness of woody debris in a sampling plot in each study site. We used aerial photographs to estimate the volume of woody debris outside the study sites. The volume of woody debris totaled 46, 260 m³. The deposits were greatest in the upper river basin in the northern area. Of the total volume, 76% originated from landslides on mountain slopes or bank erosion, and the remaining 24% was from riparian forests. Of the woody debris, 15% were conifers and the remaining 85% were broadleaf trees. An estimated 74% of the volume came from trees that were living just before Typhoon 0310 struck, and the remainder was old fallen timber. Of the woody debris, 12% of the trunks had diameters under 10 cm, 57% were 10 - 30 cm, 28% were 30 - 50 cm, and 3% were over 50 cm.

著者

鈴木 雅一 武居 有恒 福嶌 義宏

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.40, no.5, pp.4-13, 1988

被引用文献数

5

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芝生地の森林地に対する水文特性の相違を調べるために,滋賀県東南部のゴルフ場を対象として,1年間の水文観測が実施された。対象地は同一流域の上流側がアカマツ・ヒノキを主とする林地,下流側が芝生を主とするゴルフ場である。流域面積は上流観測点で23.7ha,下流観測点で77.5haであり,芝生地面積は53.8haとなる。森林地区,芝生地区の地質はそれぞれ,粗粒花崗岩,第三紀古琵琶湖層群であり,平均斜面傾斜は,それぞれ21.7°,4.12°である。年水収支の検討により,森林地区と芝生地区の年蒸発散量は836.2mm,536.7mmと見積られた。芝生地区の年蒸発散量は森林地区に較べて約300mm少ない結果である。つぎに,両地区の流出特性を定量的に評価するために,観測された日・時間・20分記録に対して,「水循環モデル」が適用された。なお,月蒸発・蒸散量の推定には,日本各地域の短期水収支を根拠とする「蒸発散推定モデル」が使われた。森林地区に対する芝生地区の流出の顕著な特徴は,降雨のほとんど大部分が直接流出となるために基底流出成分が少なく,その結果ハイドログラフの変動が激しくなる点である。