terrain modeling Articles
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Comparison of two different operational models for complex terrain in neutral flow
The estimation of pollutant concentration from sources in complex terrain is something very difficult to achieve in an operational situation. In this paper, we evaluate two different approaches of wind-field modelling. The first is a fully used, mass consistent, model (MINERVE) from Aria Technologies, based on the interpolation of wind data under the constraint of minimising flux divergence. The ...
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Evaluation of a 3-D flow and pollutant dispersion modelling system to estimate climatological groundlevel concentrations in complex coastal sites
A three-dimensional modelling system, made by a mass-consistent wind field model and by a Lagrangian particle model, has been applied to a Mediterranean complex coastal site to describe the atmospheric dispersion of pollutants emitted by a thermal power plant. Different short-term episodes have been simulated to cover the seasonal climate variability. Model results have been compared with local ...
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Dispersion modelling in complex terrain using wind climatologies
If annual mean values of concentration in complex terrain have to be determined, a representative wind climatology, which reflects local flow characteristics, is needed. This gives rise to two problems. First, observational data representative of the dispersion area are frequently not to hand. Second, the flow in the dispersion area itself may show a significant spatial structure, so transport is ...
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Environmental impact assessment of a new thermal power plant Šoštanj Block 6 in highly complex terrain
Slovenia is starting an important investment - Block 6 of the thermal power plant in Šoštanj located in the Velenje basin and characterised by very complex terrain. Air pollution examination as part of the environmental impact assessment is an interesting example of usage of the modern Lagrangian particle model Spray coupled with the diagnostic mass consistent wind field model ...
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Development of numerical model for dispersion over complicated terrain in the convective boundary layer
Complicated terrain and atmospheric stability are important factors in the predicting the dispersion of air pollutants. The aim of our study is to develop practical dispersion model for unstable conditions for regulatory use. The numerical model we adopted was a combination of the potential flow model and Lagrangian stochastic dispersion model. In this model, time-mean flow field is solved by the ...
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Effects of nocturnal thermal circulation and boundary layer structure on pollutant dispersion in complex terrain areas: a case study
For air quality models, it is important that the meteorological fields derived from meteorological models reflect the best characterisation of the atmosphere. Under strongly thermally–stratified conditions, the determining factors are turbulent kinetic energy and surface layer parameterisations. In this study, the 5th generation Mesoscale Model (MM5) and the Weather Research and Forecasting ...
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Validation of regulatory micro-scale air quality models: modelling odour dispersion and built-up areas
Gaussian and Lagrangian model runs are evaluated in comparison to field data from the Odour Release and Odour Dispersion (OROD) project and to wind tunnel data from the Mock Urban Setting Test (MUST). Different statistical metrics are discussed. The results illustrate once again that a good model performance is strongly dependent on the model input (e.g., terrain data, roughness length). ...
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A 2-D meteorological pre-processor for real-time 3-D ATD models
Horizontal non-uniformity has important effects on the structure of the atmospheric boundary layer and, consequently, on pollutant transport and dispersion. These effects can be dominant in coastal sites or in the presence of complex terrain. Advanced 3-D atmospheric dispersion models can be used to calculate short-term pollutant concentrations in such complex situations. The use of new ...
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Further considerations on WAsP, OpenWind and WindSim comparison study: Atmospheric flow modelling over complex terrain and energy production estimate
This paper analyses Brazil’s most used wind assessment computational tools: WindSim, OpenWind and Wind Atlas Analysis and Application Program (WAsP). Each program produced a Wind Resource Grid (WRG) data base – through different methodologies – utilizing the same 5 anemometric towers, elevation grid and roughness map to generate it. The turbine layout was kept the same during all simulations and ...
By VIE Brazil
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