Fig. 1. Surface pressure field and ground flow field (12:00 UTC, November 14, 1994)

Fig. 2. Ground pressure field and ground flow field (18:00 UTC, November 14, 1994)

Fig. 3. Isovolume balloon wind direction, wind speed time series

Fig. 4. Comparison of isovolume balloon trajectories with simulated trajectories

Fig. 5. Absolute error distribution of simulated trajectories

Fig. 6. Isovolume balloon wind direction, wind speed time series

Fig. 7. Comparison of isovolume balloon trajectories with simulated trajectories

Fig. 8. Absolute error distribution of simulated trajectories

Fig. 9. Isovolume balloon wind direction, wind speed time series

Fig. 10. Comparison of isovolume balloon trajectories with simulated trajectories

Fig. 11. Absolute error distribution of simulated trajectories

Fig. 12. Distribution of trajectories after release

Fig. 13. Position of the released trajectory and the concentration value above 0.0（×: the position of the simulation trajectory; ○: the position of the trajectory）

Fig. 14. The scope setting for the simulation area

Fig. 15. Distribution of the concentration of nuclear leakage substances (8:00 UTC/20:00 UTC) in nuclear power plants