著者
梯 滋郎 中村 晋一郎 沖 大幹 沖 一雄
出版者
公益社団法人 土木学会
雑誌
土木学会論文集B1(水工学) (ISSN:2185467X)
巻号頁・発行日
vol.70, no.4, pp.I_1489-I_1494, 2014 (Released:2015-05-18)
参考文献数
10

In Japan, safety degree against flood is said to have increased by river improvement. However, frequently flooded areas still exist. This means that frequently flooded areas has some characteristics which prevent river improvement. Therefore it is important to clarify the distribution and characteristics of frequently flooded areas for thinking about future river improvement plans.In this research, we clarified the distribution of frequently flooded areas in Japan, using flooded area maps. As a result, it is clarified that most frequently flooded areas exist in narrow valley plains, and the reason why such areas are still flooded is difficulty of embankment.
著者
横山 伸也 和泉 敏太郎 沖 一雄
出版者
一般社団法人 日本エネルギー学会
雑誌
日本エネルギー学会誌 (ISSN:09168753)
巻号頁・発行日
vol.90, no.12, pp.1183-1186, 2011 (Released:2011-12-28)
参考文献数
11
被引用文献数
1 2

Radioactive species such as 137Cs were discharged from Fukushima Daiichi Nuclear Power Plant which was severely damaged by the enormous earthquake and tsunami. Cropland has been radioactively contaminated by 137Cs etc. and it seems impossible to plant rice due to the non-suitability for food. According to the reports, 137Cs transferred into the rice from soil is less than 1% on the average. Therefore, it is expected that the concentration of 137Cs in bioethanol will be well below the tentative restriction value even if bioethanol could be produced from the rice. It is proposed that the rice field should be filled with water to avoid the flow of runoff contaminated by radioactive cesium compounds because they are insoluble in aqueous phase and that bioethanol should be produced from the rice in order to maintain the multifunction of rice field and to continue the agriculture. If rice farming is halted and neglected, agricultural function of rice field as well as local community will be permanently destroyed.