SCIPUFF (Second-order Closure Integrated PUFF Model)

SCIPUFF is a Lagrangian puff dispersion model that uses a collection of Gaussian puffs to predict three-dimensional, time-dependent pollutant concentrations.

three-dimensionaltime-dependentpollutant concentrations

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Initial contribute: 2019-10-14

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Application-focused categoriesNatural-perspectiveAtmospheric regions

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Quoted from: https://www.epa.gov/scram/air-quality-dispersion-modeling-alternative-models#scipuff 

Second-order Closure Integrated PUFF Model (SCIPUFF) is a Lagrangian puff dispersion model that uses a collection of Gaussian puffs to predict three-dimensional, time-dependent pollutant concentrations. In addition to the average concentration value, SCIPUFF provides a prediction of the statistical variance in the concentration field resulting from the random fluctuations in the wind field.

Quoted from: https://www3.epa.gov/ttn/scram/7thconf/information/scipuff.pdf 

SCIPUFF is a Lagrangian puff dispersion model that uses a collection of Gaussian puffs to represent an arbitrary, three-dimensional, time-dependent concentration field. The turbulent diffusion parameterization is based on modern turbulence closure theory, specifically the second-order closure model of Donaldson (1973) and Lewellen (1977), which provides a direct relationship between the predicted dispersion rates and the measurable turbulent velocity statistics of the wind field. In addition to the average concentration value, the closure model also provides a prediction of the statistical variance in the concentration field resulting from the random fluctuations in the wind field. The closure approach also provides a direct representation for the effect of averaging time (Sykes and Gabruk, 1997).

 

Shear distortion is accurately represented using the full Gaussian spatial moment tensor, rather than simply the diagonal moments, and an efficient puff splitting/merging algorithm minimizes the number of puffs required for a calculation. In order to increase calculation efficiency, SCIPUFF uses a multi-level timestepping scheme with an appropriately sized time-step for each puff. An adaptive multi-grid is used to identify neighboring puffs in the spatial domain, which greatly reduces the search time for overlapping puffs in the interaction calculation and puff-merging algorithm. Static puffs are used to represent the steady-state phase of the plume near the source and are updated only with the meteorology, also decreasing the number of puffs needed for the calculation.

 

 

SCIPUFF can model many types of source geometries and material properties. It can use several types of meteorological input, including surface and upper-air observations or three-dimensional gridded data. Planetary boundary layer turbulence is represented explicitly in terms of surface heat flux and shear stress using parameterized profile shapes. A Graphical User Interface (GUI) that runs on a PC is used to define the problem scenario, run the dispersion calculation and produce color contour plots of resulting concentrations. The GUI also includes an online ‘Help’.

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Titan Corporation (2019). SCIPUFF (Second-order Closure Integrated PUFF Model) , Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/fb5d33a7-1e69-4bbe-8999-7aae84f78b4f
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Initial contribute : 2019-10-14

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2020-10-14

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