Second-Order Closure Integrated Puff (SCIPUFF) Dispersion Model
Abstract
The Second-Order Closure Integrated Puff (SCIPUFF) model is a Lagrangian puff dispersion model using Gaussian puffs to represent an arbitrary, three-dimensional, time-dependent concentration. The diffusion parameterization is based on turbulence closure theory, which gives a prediction of the dispersion rate in terms of the measurable turbulent velocity statistics of the wind field. This generalized approach provides a unified parameterization for modelling dispersion at all ranges from laboratory to continental scales. The explicit representation of diffusion in terms of velocity statistics also provides a rational basis for the assessment of time-averaging effects.