Abstract
The Lagrangian Particle Dispersion Model (LPDM) in the 594 km× 594 km model domain with the horizontal grid scale of 3 km×3 km centered at a power plant and the Eulerian Transport Model (ETM) modified from the Asian Dust Aerosol Model 2 (ADAM2) in the domain of 70° LAT × 140° LON with the horizontal grid scale of 27 km×27 km have been developed. These models have been implemented to simulate the concentration and deposition of radionuclides (137Cs and 131I) released from the accident of the Fukushima Dai-ichi nuclear power plant. It is found that both models are able to simulate quite reasonably the observed concentrations of 137Cs and 131I near the power plant. However, the LPDM model is more useful for the estimation of concentration near the power plant site in details whereas the ETM model is good for the long-range transport processes of the radionuclide plume. The estimated maximum mean surface concentration, column integrated mean concentration and the total deposition (wet+dry) by LPDM for the period from 12 March to 30 April 2011 are, respectively found to be 2.975 × 102 Bq m-3, 3.7 × 107 Bq m-2, and 1.78 × 1014 Bq m-2 for 137Cs and 1.96 × 104 Bq m-3, 2.24 × 109 Bq m-2 and 5.96 × 1014 Bq m-2 for 131I. The radionuclide plumes released from the accident power plant are found to spread wide regions not only the whole model domain of downwind regions but the upwind regions of Russia, Mongolia, Korea, eastern China, Philippines and Vietnam within the analysis period.
Highlights
On 11 March 2011, an extraordinary magnitude 9.0 earthquake occurred off the Sanriku about 180 km off the Pacific coast of Japan’s main island Honshu, at 38.3 °N, 142.4 °E and followed by a large tsunami [1]
The Lagrangian Particle Dispersion Model (LPDM) in the 594 km × 594 km model domain with the horizontal grid scale of 3 km × 3 km centered at a power plant and the Eulerian Transport Model (ETM) modified from the Asian Dust Aerosol Model 2 (ADAM2) in the domain of 70° LAT × 140° LON with the horizontal grid scale of 27 km × 27 km have been developed
The Lagrangian Particle Dispersion Model (LPDM) in the 594 km × 594 km model domain centered at a power plant with the horizontal grid distance of 3 × 3 km2 for meteorological fields and the Eulerian Transport Model (ETM) modified from the Asian Dust Aerosol Model 2 (ADAM2) in the model domain of 140° LON × 70° LAT with the horizontal grid distance of 27 × 27 km2 co-centered with LPDM have been developed
Summary
On 11 March 2011, an extraordinary magnitude 9.0 earthquake occurred off the Sanriku about 180 km off the Pacific coast of Japan’s main island Honshu, at 38.3 °N, 142.4 °E and followed by a large tsunami [1]. These events caused a station blackout at the Fukushima Dai-ichi nuclear power plant. Fukushima Dai-ichi nuclear power plant consisted of six boiling water reactors lined up directly along the shore. The hydrogen produced in this process caused major explosions that massively damaged the upper parts of the reactor buildings of units 1 and 3. Damage to the upper parts of the reactor building could be prevented in unit 2, a hydrogen explosion were presumably damaged the suppression chamber [2]
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