Radioactivity Dynamics in River System
ＱHow does radioactive cesium carried down by rivers move in the sea? 【Example of analysis】
ＡSimulations indicate that river water flowing into estuaries spreads over the sea surface.
This is presumably because river water is less saline and warmer than seawater and thus lower in density.
On the other hand, we have found that there are seabed flows in the opposite direction, or toward the estuary, moving river-derived soil and other materials carried away from the coast back in the onshore direction.
- The movement of river water flowing into the sea was analyzed by 3D simulation (3D-Sea-SPEC).
- River water flowing into estuaries spreads over the sea surface due to salinity difference between river water and seawater.
- On the seabed, as opposed to the sea surface, flows are generated in the direction of the estuary, presumably moving river-derived soil and other materials back toward the coast.
- Do radioactive cesium concentrations in trees increase over time? If so, can such trees be used as timber?
- In future, what will be radiation exposures to forest workers? Are there any methods to reduce it?
- How much amount of radiocesium discharges into the ocean?
- Dose the radiocesium discharge ratio from rivers depend on the local environment?
- Any method to evaluate damaged location by the forest fire?