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H. Nagai · SciRah

Researcher profile · Semantic Scholar

H. Nagai

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H. Nagai — researcher profile on SciRah

h-index: 25
Works: 111
Citations: 3,875

Most-cited papers

Preliminary Estimation of Release Amounts of 131I and 137Cs Accidentally Discharged from the Fukushima Daiichi Nuclear Power Plant into the Atmosphere
M. Chino, H. Nakayama, H. Nagai, H. Terada +2 more
2011973 citations Open access
Semantic Scholar
Atmospheric discharge and dispersion of radionuclides during the Fukushima Dai-ichi Nuclear Power Plant accident. Part II: verification of the source term and analysis of regional-scale atmospheric dispersion.
H. Terada, G. Katata, M. Chino, H. Nagai
2012Journal of Environmental Radioactivity349 citations Open access
Semantic Scholar
Detailed source term estimation of the atmospheric release for the Fukushima Daiichi Nuclear Power Station accident by coupling simulations of an atmospheric dispersion model with an improved deposition scheme and oceanic dispersion model
G. Katata, M. Chino, Takuya Kobayashi, H. Terada +8 more
2014321 citations Open access
Semantic Scholar
Atmospheric discharge and dispersion of radionuclides during the Fukushima Dai-ichi Nuclear Power Plant accident. Part I: Source term estimation and local-scale atmospheric dispersion in early phase of the accident.
G. Katata, M. Ota, H. Terada, M. Chino +1 more
2012Journal of Environmental Radioactivity233 citations Open access
Semantic Scholar
Source term estimation of atmospheric release due to the Fukushima Dai-ichi Nuclear Power Plant accident by atmospheric and oceanic dispersion simulations
Takuya Kobayashi, H. Nagai, M. Chino, H. Kawamura
2013182 citations Open access
Semantic Scholar
Factors affecting vertical distribution of Fukushima accident-derived radiocesium in soil under different land-use conditions.
J. Koarashi, M. Atarashi-Andoh, T. Matsunaga, Tsutomu Sato +2 more
2012Science of the Total Environment180 citations
Semantic Scholar
Comparison of the vertical distributions of Fukushima nuclear accident radiocesium in soil before and after the first rainy season, with physicochemical and mineralogical interpretations.
T. Matsunaga, J. Koarashi, M. Atarashi-Andoh, S. Nagao +2 more
2013Science of the Total Environment140 citations
Semantic Scholar
Numerical reconstruction of high dose rate zones due to the Fukushima Dai-ichi Nuclear Power Plant accident.
G. Katata, H. Terada, H. Nagai, M. Chino
2012Journal of Environmental Radioactivity139 citations Open access
Semantic Scholar
Refinement of source term and atmospheric dispersion simulations of radionuclides during the Fukushima Daiichi Nuclear Power Station accident.
H. Terada, H. Nagai, K. Tsuduki, A. Furuno +2 more
2020Journal of Environmental Radioactivity87 citations Open access
Semantic Scholar
Large‐eddy simulation of urban boundary‐layer flows by generating turbulent inflows from mesoscale meteorological simulations
H. Nakayama, T. Takemi, H. Nagai
201284 citations Open access
Semantic Scholar
Utilization of 134Cs/137Cs in the environment to identify the reactor units that caused atmospheric releases during the Fukushima Daiichi accident
M. Chino, H. Terada, H. Nagai, G. Katata +4 more
2016Scientific Reports81 citations Open access
Semantic Scholar
Root and dissolved organic carbon controls on subsurface soil carbon dynamics: A model approach
M. Ota, H. Nagai, J. Koarashi
201366 citations
Semantic Scholar
Model Intercomparison of Atmospheric 137Cs From the Fukushima Daiichi Nuclear Power Plant Accident: Simulations Based on Identical Input Data
Yousuke Sato, M. Takigawa, T. Sekiyama, M. Kajino +17 more
2018Journal of Geophysical Research - Atmospheres56 citations Open access
Semantic Scholar
LES Analysis of the Aerodynamic Surface Properties for Turbulent Flows over Building Arrays with Various Geometries
H. Nakayama, T. Takemi, H. Nagai
201156 citations Open access
Semantic Scholar
Development of a Land Surface Model Including Evaporation and Adsorption Processes in the Soil for the Land–Air Exchange in Arid Regions
G. Katata, H. Nagai, H. Ueda, N. Agam +1 more
200751 citations Open access
Semantic Scholar
Development of a Land Surface Model Including Cloud Water Deposition on Vegetation
G. Katata, H. Nagai, Thomas Wrzesinsky, O. Klemm +2 more
200850 citations Open access
Semantic Scholar
Validation and Sensitivity Analysis of a New Atmosphere–Soil–Vegetation Model
H. Nagai
200243 citations
Semantic Scholar
Land Surface Heterogeneity in the Cooperative Atmosphere Surface Exchange Study (CASES-97). Part I: Comparing Modeled Surface Flux Maps with Surface-Flux Tower and Aircraft Measurements
Fei Chen, D. Yates, H. Nagai, M. Lemone +2 more
200342 citations Open access
Semantic Scholar
Numerical study of fog deposition on vegetation for atmosphere-land interactions in semi-arid and arid regions
G. Katata, H. Nagai, M. Kajino, H. Ueda +1 more
201041 citations
Semantic Scholar
Modeling dynamics of (137)Cs in forest surface environments: Application to a contaminated forest site near Fukushima and assessment of potential impacts of soil organic matter interactions.
M. Ota, H. Nagai, J. Koarashi
2016Science of the Total Environment39 citations
Semantic Scholar
A method for simple and accurate estimation of fog deposition in a mountain forest using a meteorological model
G. Katata, M. Kajino, Takatoshi Hiraki, M. Aikawa +2 more
201138 citations Open access
Semantic Scholar
Incorporation of CO2 Exchange Processes into a Multilayer Atmosphere–Soil–Vegetation Model
H. Nagai
200532 citations
Semantic Scholar
Development of Worldwide Version of System for Prediction of Environmental Emergency Dose Information: WSPEEDI 2nd Version
H. Terada, H. Nagai, A. Furuno, Toyokazu Kakefuda +2 more
200830 citations Open access
Semantic Scholar
Reconstruction of residents’ thyroid equivalent doses from internal radionuclides after the Fukushima Daiichi nuclear power station accident
T. Ohba, T. Ishikawa, H. Nagai, S. Tokonami +2 more
2020Scientific Reports27 citations Open access
Semantic Scholar
Land Surface Heterogeneity in the Cooperative Atmosphere Surface Exchange Study (CASES-97). Part II: Analysis of Spatial Heterogeneity and Its Scaling
D. Yates, Fei Chen, H. Nagai
200327 citations Open access
Semantic Scholar
Coupling atmospheric ammonia exchange process over a rice paddy field with a multi-layer atmosphere–soil–vegetation model
G. Katata, Kentaro Hayashi, Kensuke Ono, H. Nagai +2 more
201325 citations
Semantic Scholar
Atmospheric Modeling of 137Cs Plumes From the Fukushima Daiichi Nuclear Power Plant—Evaluation of the Model Intercomparison Data of the Science Council of Japan
Kyo Kitayama, Y. Morino, M. Takigawa, Takashi Nakajima +16 more
2018Journal of Geophysical Research - Atmospheres24 citations
Semantic Scholar
Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation. Part 3: turbulent flow and plume dispersion in building arrays
H. Nakayama, K. Jurčáková, H. Nagai
200924 citations Open access
Semantic Scholar
Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation. Part 4: turbulent flows and plume dispersion in an actual urban area
H. Nakayama, B. Leitl, F. Harms, H. Nagai
201423 citations Open access
Semantic Scholar
Validation and sensitivity analysis of a new atmosphere-soil-vegetation model. Part II: Impacts on in-canopy latent heat flux over a winter wheat field determined by detailed calculation of canopy radiation transmission and stomatal resistance
H. Nagai
200323 citations
Semantic Scholar
Importance of root HTO uptake in controlling land-surface tritium dynamics after an-acute HT deposition: a numerical experiment.
M. Ota, H. Nagai, J. Koarashi
2012Journal of Environmental Radioactivity22 citations
Semantic Scholar
Development of LOcal-scale High-resolution atmospheric DIspersion Model using Large-Eddy Simulation. Part 5: detailed simulation of turbulent flows and plume dispersion in an actual urban area under real meteorological conditions
H. Nakayama, T. Takemi, H. Nagai
201618 citations Open access
Semantic Scholar
Source Term Estimation of 131I and 137Cs Discharged from the Fukushima Daiichi Nuclear Power Plant into the Atmosphere
H. Nagai, G. Katata, H. Terada, M. Chino
201418 citations Open access
Semantic Scholar
Development and validation of a dynamical atmosphere-vegetation-soil HTO transport and OBT formation model.
M. Ota, H. Nagai
2011Journal of Environmental Radioactivity18 citations
Semantic Scholar
Development of Local-Scale High-Resolution Atmospheric Dispersion Model Using Large-Eddy Simulation Part 1: Turbulent Flow and Plume Dispersion over a Flat Terrain
H. Nakayama, H. Nagai
200917 citations Open access
Semantic Scholar
Development of an Atmosphere-Soil-Vegetation Model for Investigation of Radioactive Materials Transport in the Terrestrial Biosphere (Selected Papers of the Joint International Conference of Supercomputing in Nuclear Applications and Monte Carlo : SNA + MC 2010)
G. Katata, H. Nagai, Lei-Ming Zhang, A. Held +2 more
201115 citations Open access
Semantic Scholar
Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation part 6: introduction of detailed dose calculation method
H. Nakayama, D. Satoh, H. Nagai, H. Terada
2021Journal of Nuclear Science and Technology14 citations Open access
Semantic Scholar
Atmospheric-dispersion database system that can immediately provide calculation results for various source term and meteorological conditions
H. Terada, H. Nagai, Atsunori Tanaka, K. Tsuduki +1 more
202014 citations Open access
Semantic Scholar
Development of Local-Scale High-Resolution Atmospheric Dispersion Model Using Large-Eddy Simulation Part 2: Turbulent Flow and Plume Dispersion around a Cubical Building
H. Nakayama, H. Nagai
201114 citations Open access
Semantic Scholar
Large-eddy simulation of plume dispersion under various thermally stratified boundary layers
H. Nakayama, T. Takemi, H. Nagai
201412 citations Open access
Semantic Scholar
Large-Eddy Simulation of plume dispersion within various actual urban areas
H. Nakayama, K. Jurčáková, H. Nagai
201312 citations Open access
Semantic Scholar
Development of local-scale high-resolution atmospheric dispersion and dose assessment system
H. Nakayama, Naoyuki Onodera, D. Satoh, H. Nagai +2 more
2022Journal of Nuclear Science and Technology10 citations Open access
Semantic Scholar
Validation of a Lagrangian atmospheric dispersion model against middle-range scale measurements of 85Kr concentration in Japan
H. Terada, H. Nagai, H. Yamazawa
201310 citations Open access
Semantic Scholar
Large-Eddy Simulation on turbulent flow and plume dispersion over a 2-dimensional hill
H. Nakayama, H. Nagai
200910 citations Open access
Semantic Scholar
Dependency of the source term estimation method for radionuclides released into the atmosphere on the available environmental monitoring data and its applicability to real-time source term estimation
H. Terada, H. Nagai, M. Kadowaki, K. Tsuduki
2023Journal of Nuclear Science and Technology9 citations Open access
Semantic Scholar
Intercomparison of numerical atmospheric dispersion prediction models for emergency response to emissions of radionuclides with limited source information in the Fukushima Dai-ichi nuclear power plant accident
T. Iwasaki, T. Sekiyama, T. Nakajima, A. Watanabe +9 more
2019Atmospheric Environment9 citations
Semantic Scholar
Impacts of C-uptake by plants on the spatial distribution of 14C accumulated in vegetation around a nuclear facility-Application of a sophisticated land surface 14C model to the Rokkasho reprocessing plant, Japan.
M. Ota, G. Katata, H. Nagai, H. Terada
2016Journal of Environmental Radioactivity9 citations
Semantic Scholar
A land surface ¹⁴C transfer model and numerical experiments on belowground ¹⁴C accumulation and its impact on vegetation ¹⁴C level.
M. Ota, H. Nagai, J. Koarashi
2012Journal of Environmental Radioactivity9 citations Open access
Semantic Scholar
Quantitative visualization of a radioactive plume with harmonizing gamma-ray imaging spectrometry and real-time atmospheric dispersion simulation based on 3D wind observation
H. Nagai, Y. Furuta, H. Nakayama, D. Satoh
2023Journal of Nuclear Science and Technology8 citations Open access
Semantic Scholar
Improvement of atmospheric dispersion simulation using an advanced meteorological data assimilation method to reconstruct the spatiotemporal distribution of radioactive materials released during the Fukushima Daiichi Nuclear Power Station accident
M. Kadowaki, H. Nagai, H. Terada, G. Katata +1 more
20178 citations Open access
Semantic Scholar

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