APPENDIX II. - NOTATION 



A Plant area density 



Af. Frontal plant area density 



A^^ i^etted plant area density 



C Mean species concentration 



c Species fluctuation 



c^ Species diffusion coefficient 



Cf Skin friction drag coefficient 



c Profile drag coefficient 



c^ Empirical constant 



D Species diffusivity 



g Gravitational acceleration 



h Height of vegetation canopy 



k Nikuradse roughiness parameter 



P Mean pressure 



q Root-mean velocity fluctuation 



Ri«R2iR3.R'4 Resistance to deposition in the four regions 



shown in Figure 6 



T^^ irfave period 



t Time 



^i'^i'^k Mean velocity components 

 "i'^i'^k Fluctuating velocity components 



U Mean longitudinal velocity 



W Mean vertical velocity 

 Wg - Settling speed of particles 



X ,y Horizontal coordinates 



z Vertical coordinate 



Zp Aerodynamic roughness 



a Model constant 



6ij Kronecker delta 



Ej^jjj Alternating tensor 



A Turbulent macroscale 



H Mean temperature 



Temperature fluctuation 



K Thermal diffusivity 



6u Standard deviation of U 



6„ Standard deviation of A 



V Kinematic viscosity 



p Density 



^ Phase angle 



Q Earth's rotation 



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