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- Title
Spatial variation in low-level Cs in the coastal sediments off central Honshu in the Sea of Japan: implications for delivery, migration, and redistribution patterns.
- Authors
Inoue, Mutsuo; Uemura, H.; Kofuji, H.; Fujimoto, K.; Takata, H.; Shirotani, Y.; Kudo, N.; Nagao, S.
- Abstract
In 2014 and 2015, we examined the spatial distribution of cesium-134 (half-life: 2.06 years) from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in marine sediments within coastal-basin areas (water depths of 40-520 m) off central Honshu Island (the main island of Japan) in the Sea of Japan. The Cs concentrations in both the surface sediment (0-1 cm depth) and whole-core inventory exhibited wide variations, and were highest at the site closest to the Agano River Estuary area (6.7 Bq/kg-dry and 886 Bq/m, respectively). This indicates that Cs in coastal areas was delivered by riverine suspended solids (SS). Given the spatial variation in Cs concentrations, we believe that Cs partially migrated northeastward within ~50 km along Honshu Island (at water depths shallower than ~140 m), and southwestward, including the Sado Basin area. This is predominantly attributable to the transport of SS by bottom currents and unsteady downward delivery onto the steep slopes of the basin. The total amount of Cs in the study area in 2014 was estimated at approximately 0.6 TBq (decay-corrected to March 11, 2011, date of FDNPP accident).
- Subjects
CESIUM; MARINE sediments; OCEAN bottom; SUSPENDED solids; NUCLEAR power plant accidents
- Publication
Journal of Oceanography, 2017, Vol 73, Issue 5, p571
- ISSN
0916-8370
- Publication type
Article
- DOI
10.1007/s10872-017-0437-x