Abstract
Abstract : Under previous support from the Army Research Office (ARO), we developed Lagrangian particle dispersion models (LPDMs) for dispersion in convective and stable planetary boundary layers (PBLs) including some with a forest canopy and showed that predicted concentration fields agreed well with laboratory data and field observations. For the ARO program just completed, this work was extended to dispersion in more stable PBLs and stable boundary layers (SBLs) over horizontally heterogeneous surfaces. This was pursued in part using our new coupled multi-layer canopy - soil model. The program consisted of three main investigations. The first had two parts: a) further development of the coupled-canopy large-eddy simulation (LES) model and comparison with observations from the CHATS (Canopy Horizontal Array Turbulence Study) field program, and b) modeling of canopy dispersion using the LPDM-LES approach and assessment of this with the CHATS dispersion data. The second was an investigation of the effects of a surface-temperature heterogeneity on dispersion in the SBL. The third study a) used the coupled model to produce a more stable boundary layer and applied the LES fields generated from this to drive our LPDM, and b) developed an LPDM based on parameterized turbulence profiles for modeling dispersion in more stable PBLs.
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