CTDMPLUS (Complex Terrain Dispersion Model Plus Algorithms for Unstable Situations)

Complex Terrain Dispersion Model Plus Algorithms for Unstable Situations. A refined point source gaussian air quality model for use in all stability conditions for complex terrain.

point sourceair qualitystability conditionscomplex terrain



Initial contribute: 2019-10-14


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Application-focused categoriesNatural-perspectiveAtmospheric regions

Detailed Description

English {{currentDetailLanguage}} English

Quoted from: Perry, S.G., 1992. CTDMPLUS: A dispersion model for sources near complex topography. Part I: Technical Formulations. Journal of Applied Meteorology, 31(7), pp.633-645https://doi.org/10.1175/1520-0450(1992)031<0633:CADMFS>2.0.CO;2 

The Complex Terrain Dispersion Model (CTDMPLUS), a point-source, steady-state model for complex-terrain applications, is described. The model simulates the flow and plume distortion near user-selected, three-dimensional terrain features, yet retains simplicity by applying flow-distortion corrections to flat-terrain, Gaussian, and bi-Gaussian pollutant distributions.

The algorithms for stable and near-neutral conditions are based on the demonstrated concept of a dividing streamline. These algorithms were developed using data from three major plume-impaction field studies and a number of fluid-modeling studies. The algorithms for plumes released into convective layers are based on recent understanding of the convective boundary layer through fluid modeling, numerical modeling, and field studies. The non-Gaussian nature of vertical dispersion is accounted for; lateral dispersion is modeled with the aid of convective scaling concepts.

A terrain preprocessor and a meteorological preprocessor, which provide input specifically for the CTDMPLUS model, are described. The model requires a fully three-dimensional description of individual terrain features in order to estimate flow (and plume) distortions. Estimates of surface-layer parameters (friction velocity and Monin-Obukhov length) and depth of the mixed layer are required to define the state of the boundary layer.


US Environmental Protection Agency (2019). CTDMPLUS (Complex Terrain Dispersion Model Plus Algorithms for Unstable Situations), Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/62f2572a-519b-4428-ae01-43179a6ef5e5


Initial contribute : 2019-10-14



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