A semi-Lagrangian model incorporating a spectral method for pollutant transport and diffusion
- Environmental Measurements Lab., New York, NY (United States)
To improve the semi-Lagrangian model, a spectral method was incorporated in the numerical calculations. This spectral method for solving nonperiodic boundary problems was based on a technique of decomposing a variable (i.e. pollutant concentration) into a polynomial and a periodic Fourier residual. A fifth-order polynomial was proposed. When performing the semi-Lagrangian calculation, the spectral intrapolation for estimating the transport of material between grid points was used. From this, a method for removing small negative masses without lossing mass conservation was developed. The numerical tests of the semi-Lagrangian scheme with the spectral interpolation on the advective transport of a mass under nonuniform and uniform winds in a limited computational domain were performed previously and published. In this study, the scheme was applied to solve the two-dimensional time-dependent advection-diffusion equation describing the transport and dispersion of atmospheric pollutants. The calculations demonstrated the efficiency and accuracy of the numerical solutions in a limited region by using this semi-Lagrangian technique incorporated with the spectral method. The main objective of this present study was to develop an advanced numerical modelling technique for air pollution studies on a regional scale.
- OSTI ID:
- 28744
- Report Number(s):
- CONF-940115-; TRN: 95:002816-0035
- Resource Relation:
- Conference: 8. Joint conference on applications of air pollution meterology. 74. American Meteorological Society annual meeting, Nashville, TN (United States), 23-28 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Eighth joint conference on applications of air pollution meteorology with A & WMA; PB: 359 p.
- Country of Publication:
- United States
- Language:
- English
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