Development of a radionuclide transport model applicable to coastal regimes with multi-fractional cohesive and non-cohesive sediments

Abstract

We describe the development of a new three-dimensional radionuclide transport model applicable tocoastal waters with non-uniform distribution of suspended and bed sediments of both cohesive and non-cohesive types. The model calculates the concentration of radionuclides in bed sediments and pore water as well as in dissolved and particulate phases in the water column. The transfer of activity between the water column and the pore water in the upper layer of the bottom sediment is governed by diffusion processes. For the simulation of the three-dimensional circulation and wave fields, the hydrodynamic numerical model SELFE has been used.Issues related to the calibration of the sediment transport model in the Yellow Sea are described. Model of radionuclide dispersion was verified on measurements of 137Cs concentration in surface water and bed sediments after theFukushima Daiichi nuclear accident. concentration of radionuclides in bed sediments and pore water as well as in dissolved and particulate phases in the water column. The transfer of activity between the water column and the pore water in the upper layer of the bottom sediment is governed by diffusion processes. For the simulation of the three-dimensional circulation and wave fields, the hydrodynamic numerical model SELFE has been used.Issues related to the calibration of the sediment transport model in the Yellow Sea are described. Model of radionuclide dispersion was verified on measurements of 137Cs concentration in surface water and bed sediments after theFukushima Daiichi nuclear accident.