従来,復旧治山が主であったが近年は予防治山も重視されるようになった。そのため,事業に対する必要性の判断が重要となり,危険性が高いと判断される地区や支流域から順次事業を行う必要性が生じている。三重県では山地森林の適正な管理を目的とした森林GISデータベースが整備されており,治山分野に対してもこのデータベースを活用することが求められている。そこで,森林データベースを用いた山地流域の土砂災害に対する被災危険度を評価するための基準作りを目的として,崩壊との関連性の高い諸要因を設定し,数量化理論を用いて崩壊の発生・非発生事例を分析し,支流域単位での崩壊危険率の算定を行った。次に,求められた各支流域の崩壊因子と保全因子に基づき,対象地域における支流域ごとの被災危険度の評価を行った。
1 0 0 0 OA 裸地化した林床における強度間伐の影響
- 著者
- 沼本 晋也 林 拙郎 河井 智 野々田 稔郎
- 出版者
- 一般社団法人 日本治山治水協会
- 雑誌
- 水利科学 (ISSN:00394858)
- 巻号頁・発行日
- vol.54, no.6, pp.84-106, 2011-02-01 (Released:2017-08-04)
- 参考文献数
- 18
1 0 0 0 OA 三重大学平倉演習林におけるスギ人工林の林床被覆と土砂移動量の観測
- 著者
- 沼本 晋也
- 出版者
- 水文・水資源学会
- 雑誌
- 水文・水資源学会研究発表会要旨集 水文・水資源学会2018年度研究発表会
- 巻号頁・発行日
- pp.238, 2018 (Released:2018-12-28)
1 0 0 0 OA 日本における最近50年間の土砂災害被害者数の減少傾向
- 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.
1 0 0 0 OA 2011年9月台風12号による紀伊半島で発生した土砂災害
1 0 0 0 OA 1999年台湾集集地震およびその後の豪雨による土砂災害
- 著者
- 近藤 観慈 林 拙郎 王 文能 沼本 晋也 川邊 洋
- 出版者
- 日本自然災害学会
- 雑誌
- 自然災害科学 (ISSN:02866021)
- 巻号頁・発行日
- vol.22, no.3, pp.255-270, 2003-11-30
- 被引用文献数
- 3
The Chi-chi earthquake, which occurred on September 21, 1999, generated serious damage mainly in the central Taiwan. The number of deaths and missings caused by the earthquake became the scale which ranks second to the Hsinchu-Taichung earthquake which occurred in 1935. Not only in the urban area but also in the mountainous area, the earthquake caused terrible damage due to the upheaval of the ground, cave-ins and landslides. About two years after the Chi-chi earthquake, two typhoons (Toraji, Nari) crossed over central Taiwan in June and September, respectivelys in 2001. These generated serious damage as well in the same area which had suffered damages from the Chi-chi earthquake. This paper shows the sediment disasters in the mountainous area caused by this earthquake and by these typhoons. The situations of sediment disasters, along with the history of natural disasters in Taiwan, are summarized.
1 0 0 0 OA 2004年台風21号と前線による豪雨災害
- 著者
- 葛葉 泰久 沼本 晋也 カザディ サンガ ンゴイ 福山 薫
- 出版者
- 日本自然災害学会
- 雑誌
- 自然災害科学 (ISSN:02866021)
- 巻号頁・発行日
- vol.24, no.4, pp.409-421, 2006-02-28
- 被引用文献数
- 3
Mie Prefecture suffered from water-related disasters due to the Typhoon T200421 on September 29, 2004. Nine persons died, about 70 houses were destroyed by debris flows, slope failures or landslides, and more than 5,000 households were inundated. In this work, first, we analyze meteorological data and conclude that the heavy rainfall were caused by the existence of a stationary front into which the typhoon supplied warm humid air masses, and the orographic conditions over Mie. Secondly, we estimate the return period of t-hour (t=1, 2, 3, 6, 12, 24 hours) precipitation at four locations in the prefecture. Finally, disasters due to landslides or debris flows in Miyagawa Village are overviewed and discussed. The above-mentioned meteorological analysis shows a very close relationship between the locations of heavy precipitations during relatively long terms (say 24 hours) and the occurrence of debris flows or landslides.