Japan Geoscience Union Meeting 2014

Presentation information

Print

Poster

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-HW Hydrology & Water Environment

[A-HW28_30PO1] Water and material transport and cycle in watersheds: from headwater to coastal area

Wed. Apr 30, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Chikita Kazuhisa(Department of Natural History Sciences, Faculty of Science, Hokkaido University), Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Shin-ichi Onodera Shin-ichi(Graduate School of Integrated and Arts Sciences, Hiroshima University), Shinji Nakaya(Department of Civil Engineering, Faculty of Engineering, Shinshu University), Masahiro Kobayashi(Forestry and Forest Products Research Institute), Mitsuyo Saito(Graduate School of Environmental and Life Science, Okayama University), Seiko Yoshikawa(Narional Institute of Agro-Environmental Sciences), Noboru Okuda(Center for Ecological Research, Kyoto University)

6:15 PM - 7:30 PM

[AHW28-P14] Feature of distribution of radioactive cesium in irrigation canal

*Tomijiro KUBOTA1, Hiroyuki TARUYA1, Yoshikazu TANAKA1, Koji HAMADA1 (1.National Institute for Rural Engineering, NARO)

Keywords:radioactive cesium, irrigation canal, sediment, air dose rate

The purpose of this study is to clarify distributive characteristics of a radioactive cesium in the irrigation canal by examining the radioactive cesium contained in the bottom sediment along the canal from its intake to the downstream. One of the millrace located in Fukushima Prefecture was selected as a case for investigation, and the distribution of the amount of the sedimentation, the concentration of radioactive cesium in the bottom sediment, and the air dose rate were examined. The sandy deposit was seen in the upstream of the canal, and those concentration of radioactivities Cs were comparatively low with 1-5kBq kg-1. On the other hand, relatively high concentration of radioactivity Cs was seen in the downstream of canal, and was within 3-28kBqkg-1. The air dose rate in the waterway were relatively low because of the influence of ponding, relatively high air dose rate were seen in the place where the depositional surface had been exposed.