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
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)

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
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

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
沼本 晋也 鈴木 雅一 太田 猛彦
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.51, no.6, pp.3-12, 1999-03-15 (Released:2010-04-30)
参考文献数
27
被引用文献数
2

We investigated the trends in the number of persons killed or missing by sediment disasters such as landslides and debris flows in the last fifty years in Japan. Since sediment disasters initiated by earthquakes and volcanic activity occurred intermittently and the deaths and missings caused by them were much less than caused by rainfall-triggered sediment disasters, it is appropriate to discuss trends in the number of persons killed or missing by heavy-rainfall related sediment disasters compared with trends in rainfall-triggered disasters including flood disasters. The number of persons killed or missing by both sediment disasters and heavy-rainfall related disasters has apparently been decreasing. The number of persons killed or missing by heavy-rainfall related disasters calculated as a ten-year running average exceeded 1000 persons/year in the 1950 s, 300 persons/year in the late 1960 s, and 100 persons/year in the 1990 s. Furthermore, the ratio of heavy-rainfall related sediment disaster victims to the heavy-rainfall related disaster victims has decreased from 2/3 in the 1970 s to 2/5 after the 1980 s.
著者
宮越 英紀
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.38, no.2, pp.28-30_2, 1985-07-20 (Released:2010-04-30)
参考文献数
3
著者
池田 誠 福島 淳一 横尾 公博
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.68, no.6, pp.51-54, 2016-03-15 (Released:2017-03-21)
参考文献数
1

Mt.Sinabung, which is located in the north side of Sumatra Island, has made the first steam explosion in the historical record in August 2010. After three years of the lull, the volcano became active again in September 2013 and it has continued until now. This report describes the field reconnaissance results conducted in December, 2015. The pyroclastic flow deposits were widely spread from the east to south-southeast slopes of the volcano, and the tongueshaped deposit of lava flow has been accumulated in the center of the pyroclastic flow deposits. The riverbed of Borus River rose remarkably at the downstream. It is thought that the sediment supply of pyroclastic deposit has continued flowing into the Borus River until now. On the other hand, debris flows have occurred frequently in the rivers/stream located in south to south-west slopes, and have caused damages to villages, main roads, and the bridges. It is assumed that debris flows easily occur after the eruption. The residents in the village of the east to south slopes have been already evacuated, and gabions and check dams are currently under construction as the emergency measures. Permanent measures are required to be implemented subsequently.
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

We quantified the woody debris on the flood plain of the Appetsu River, watershed area is 287.9 km<sup>2</sup>, 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 m<sup>3</sup>. 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
氷見山 幸夫
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.5, pp.62-72, 2011-01-15 (Released:2014-11-01)
参考文献数
8
著者
西田 顕郎 小橋 澄治 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.49, no.6, pp.9-16, 1997-03-15 (Released:2010-04-30)
参考文献数
25
被引用文献数
5

Landslides during an earthquake often occur at peculiar topography, that is, steep and convex slopes. We examined these features by two parameters using digital terrain models of actual mountain slopes which had suffered from earthquake-induced landslides. These parameters, one is slope gradient and the other is mean curvature, worked well distinguishing those landslide slopes among all slopes. Especially when these parameters were derived on particular node distances, they had significant effects. These special node distances should reflect dominant scales of principal mechanisms or factors of initiation of the landslides. The dominant scales were lOm for gradient and 50m for curvature. Using these results, we developed an evaluation method concerning the susceptibility of slopes to earthquake landslides.
著者
太田 猛彦
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.54, no.4, pp.107-111, 2001-11-15 (Released:2010-04-30)
参考文献数
7
被引用文献数
1
著者
辰野 良秋 堀内 照夫
出版者
Japan Society of Erosion Control Engineering
雑誌
新砂防 (ISSN:02868385)
巻号頁・発行日
vol.1959, no.32, pp.21-26, 1959

(1) 霜柱は一般に土壤を混んじて上長し, これが土壤侵蝕, 斜面緑化不成功の原因になるが, 展圧された土壤面, 新しい盛土, 切土面から発生する霜柱は, 土壤中の水分を多量に析出するが, 扛起する土量は非常に少い。<br>(2) 発生する霜柱の量は, 土壤条件が一様であれば気温が零度以下にある間の積算温度に比例する。また積算温度は最低気温に比例する。<br>(3) 藁伏工は気温が低くない間は (-3°程度まで) 効果は著しいが, それ以下に低下すれば効果は半減する。しかしながら裸地に比較すると霜柱発生量は少く, 発生する霜柱も土壤表面から出るので, 侵蝕防止的にも, 斜面混播保護の面からも効果は期待出来るが, 藁の量, 伏せ方等には問題が残された。この場合3本並べが良いと考えられた。<br>(4) 霜柱, 凍上現象は斜面の方位によつて著しく趣を異にするが, 斜面の上, 下の部位によつても異る。<br>(5) 土壤改良剤の土質改良効果は粘質土に対する場合, アロンA-20pに顕著な効果が認められ, 霜柱の発生を防ぐことは出来たが, 受蝕性が却つて大となつた。
著者
中俣 三郎
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.40, no.1, pp.32-38, 1987-05-20 (Released:2010-08-06)
参考文献数
43