Lagrangian Particle Method for Local Scale Dispersion Modeling

6th Asian Physics Symposium

Sunarko^1 ; Zakisu'Ud^2

Center for Energy System Assessment, National Nuclear Energy Agency, Jakarta, Indonesia^1

Department of Physics, Institut Teknologi Bandung, Bandung, Indonesia^2

关键词: Atmospheric stability;    Complex topographies;    Deterministic modeling;    Dispersion analysis;    Dispersion modeling;    Lagrangian particle dispersions;    Lagrangian particle method;    Vertical relationships;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/739/1/012122/pdf
DOI  :  10.1088/1742-6596/739/1/012122

来源: IOP

【 摘 要 】

A deterministic model is developed for radioactive dispersion analysis based on random-walk Lagrangian Particle Dispersion Method (LPDM). A diagnostic 3dimensional mass-consistent wind-field with a capability to handle complex topography can be used to provide input for particle advection. Turbulent diffusion process of particles is determined based on empirical lateral and linear vertical relationships. Surface-level concentration is calculated for constant unit release from elevated point source. A series of 60-second segmented groups of particles are released in 3600 seconds total duration. Averaged surface-level concentration within a 5 meter surface layer is obtained and compared with available analytical solution. Results from LPDM shows good agreement with the analytical result for vertically constant and varying wind field with the same atmospheric stability.