Hiromasa Nakayama

TL;DR: In this article, the preliminary estimation of release amounts of 131I and 137Cs from the Fukushima Daiichi nuclear power plant into the atmosphere has been presented, with the aim to estimate the amount of radiation released by the plant.

TL;DR: In this paper, a large-eddy simulation (LES) was used to generate turbulent winds over urban areas under real meteorological conditions by using mesoscale meteorological simulations in order to conduct building-resolving largeeddy simulations (LESs) of boundary-layer flows.

TL;DR: In this article, the authors describe aerodynamic roughness properties for turbulent flows over various building arrays that represent realistic urban surface geometries, and evaluate the roughness parameters such as roughness length z0 and drag coefficient.

TL;DR: A local-scale atmospheric dispersion model using large-eddy simulation (LES) was developed to accurately predict the dispersion behavior of radioactive materials for the safety assessment of nuclear facilities and emergency responses against accidental release from nuclear facilities as discussed by the authors.

TL;DR: In this paper, the authors developed a local-scale high-resolution atmospheric dispersion model using large-eddy simulation (LOHDIM-LES) to assess the safety at nuclear facilities and to respond to emergency situations resulting from accidental or deliberate releases of radioactive materials (e.g., a terrorist attack in an urban area).