复杂地形机械湍流扩散的粒子随机行走模拟.pdf

12 6 Research o Environmental Sciences V ol. 12 , No . 6, 1999 姚仁太 张茂栓 ( , 030006) , , , , A Random Walk Simulation of Particle Displacements for Mechanical Turbulent Diffusion in Complex Terrain YA O Rentai ZHA N G Maoshuan ( China Institute or Radiation Protection , T aiyuan 0 30006) Abstract Random w alk simulat ion has been u sed to simulate the emission rom an elevated point source in complex terr ain in neutral condition . T he co mparisons o results obtained rom this model w ith those rom w ind tunnel test indicate that they w ere w ell consis- tent . Although there ar e no di iculties r om a technical point o view in applying rando m w alk methods to complex terr ain, some problem s egarding the model par ameters still have to be considered more car e ully. Keywords Random w alk simulat ion; Dispersion; Complex terrain ; M echanical turbulence ( Mont e Carlo ( ) ) , , , , 1 , 111 , , , , , xyz , L a- [ 1~ 3] grange , : , , x ( t + $t) = x ( t) + i i v…( x ( t) , t) # $t + v c ( x ( t) , t) # $t i i i i (