plume modeling Articles
-
Analytical offline approach for concentration fluctuations and higher order concentration moments
We developed a fluctuating plume model able to evaluate all the higher order moments of concentration only requiring the knowledge of the first one. The simple algorithm used to calculate the meander centroid component is independent of the method used to obtain the mean concentration field and makes the computational time lower than most meandering plume model versions. Thus, it is especially ...
-
Evaluation of a hybrid model for simulating short term high NOx concentration in Chiba
In the Tokyo metropolitan area, high NOx concentrations have been frequently observed in winter. The Chiba Prefectural Government in the area paid attention to this situation, focusing on the local region where the highest concentration was observed. This local situation was simulated with a hybrid model of the mesoscale Eulerian multi-box and Gaussian plume models. Statistical evaluation of its ...
-
Gaussian plume modeling of contaminant transport
A technique for modeling contaminant transport based on Markov process theory is developed. Transport is quantified by summing the first two moments of independent random displacements and applying the central limit theorem (CLT) to obtain solute distributions of a Gaussian nature. For non-uniform flow fields the CLT is applied in a streamfunction/equitravel time space and transforms are used to ...
-
Accounting for effects of wind rotation in the PBL on the plume characteristics
The present work aims at demonstrating the influence of a number of dynamic effects in the PBL on the pollution concentration from a point source. The diffusion plume model applied in the study is based on the moment method. Limited number of numerical simulations, based on a more general model of a non-stationary, stratified, baroclinic PBL over a sloping terrain are carried out. The results are ...
-
Model evaluation of the Austrian Gaussian plume model ON M 9440: comparison with the Kincaid dataset
The Austrian Gaussian plume model ON M 9440 is evaluated with the Kincaid dataset using the workshop model validation kit. Results are shown for different meteorological options. Mean model concentrations compare well with or overestimate measured data, depending on the choice of these options.Keywords: Gaussian plume model, Kincaid data, model evaluation, plume rise, atmospheric dispersion ...
-
Application of meteorological pre-processor for next generation dispersion models for Hungary
Research has been started by Hungarian regulatory modellers for the preparation of next generation dispersion models applied in EIA studies. This new generation will require advanced planetary boundary layer parameters in Gaussian plume models. The author investigated the validation of the meteorological pre-processor TRIP for Hungary.Keywords: meteorological pre-, processors, atmospheric ...
-
Model evaluation of the Austrian Gaussian plume model ON M 9440: comparison with the Copenhagen and the Lillestrom datasets.
The Austrian Gaussian plume model ON M 9440 is evaluated with the Copenhagen and the Lillestrom datasets using the workshop model validation kit. Results strongly depend on the dataset used. Calculated concentrations agree best with the Copenhagen data (including the previous evaluation with the Kincaid data by Pechinger and Petz, 1995). As with other Gaussian models, there were problems with ...
-
Comparison of predictions of the Hybrid Plume Dispersion Model with observations at the Kincaid power plant
The Hybrid Plume Dispersion Model (HPDM) has been evaluated with observations from a field experiment at the Kincaid power plant. HPDM is a dispersion model for buoyant plumes that employs parameterisations of boundary-layer wind, temperature, and turbulence profiles and Lagrangian time-scales. The model accounts for the bimodal distribution of turbulent velocities in the convective boundary ...
-
Evaluation of detection abilities of monitoring networks using multiple assessment criteria
The problem of evaluation of radiation monitoring network quality is considered. The comparison of possible network configurations is performed on simulated experiments where a twin model is used to simulate observed data. An assimilation procedure based on the particle filter approach is run for each configuration of the network. Specifically, multiple realisations of segmented Gaussian plume ...
-
Predicting concentration fluctuations with a puff-particle model
This paper demonstrates that the puff-particle model (PPM) allows for the prediction of concentration fluctuations (in addition to the estimation of the concentration itself). Several models have been developed based on Gifford's meandering plume concept to separate the dispersing effect of instantaneous plume (or puff) growth, and of meandering. They all have in common the assumption of a ...
-
Dispersion from elevated sources above obstacle arrays: modelling requirements
A series of wind-tunnel experiments is used to investigate the requirements of "practical" models for the prediction of the behaviour of stack emissions from an industrial site (i.e. a group of buildings), in particular for the determination of ground-level concentration or exposure downwind from the site. The study addresses Gaussian plume modelling and, assuming that an adequate model ...
-
Large-eddy simulation and practical models
A large-eddy simulation for a point source emission has been compared with four practical dispersion models suitable for regulatory purposes, and with atmospheric measurements. The large-eddy simulation calculates the turbulent velocity field in detail and uses this to solve the conservation equation for the pollutant. The practical models are variants of the Gaussian plume model. The ...
-
On the dispersion models and atmospheric dispersion
As an air pollutant is transported, the pollutant disperses into the surrounding air so that it arrives at a lower concentration than it was on leaving the source. Strict environmental regulations worldwide resulted in a growing concern about the validity of air quality dispersion models. The present work is a try to evaluate the applicability of some dispersion models on the emission from an ...
-
Developing new correlations and uncertainty analysis for the prediction of ground-level and maximum ground-level concentrations
The determination of Ground Level Concentration (GLC) and Maximum Ground Level Concentration (MGLC) is useful for the prediction of violations for air quality regulations. In this study, the predictions of GLC and MGLC when using different existing empirical formulas are analysed and the effect of dispersion parameters is investigated. Sensitivity analysis studies using both a first order and a ...
-
The plume model MODIS: integration in the Hydro-Quebec shell
The comprehensive numerical model MODIS for the simulation of pollutant dispersion from a point source is integrated in the graphical shell of Hydro-Quebec. The shell has been developed by Hydro-Quebec to offer a valuable scheme for various applications of software products, which were originally conceived only for scientific purposes. MODIS, developed by the GKSS Research Centre Geesthacht and ...
-
A Gaussian puff model with optimal interpolation for air pollution modelling assessment
A Gaussian plume model was modified to simulate the dispersion of non-reactive air pollutants under non-homogeneous wind conditions through a multi-puff approach. It was applied to the city of Lisbon and evaluated by comparison with measured sulphur dioxide data, showing a reasonable skill to estimate the transport and dispersion of pollutants under complex wind field and different atmospheric ...
-
Modelling the dispersion of motor vehicle exhaust gases, including building effects, and its application to the calculation of NOx concentration in Osaka City
This paper presents a model for dispersion of NOx from motor vehicles and stationary sources in urban areas. Annual average NOx concentrations from these sources were calculated using the Gaussian plume model. The calculated concentrations were compared with the observed concentrations at 67 air monitoring stations located in Osaka Plain. The effect of mechanical turbulence resulting from ...
-
Numerical Simulations on Aerodynamics of Thermally Induced Plumes
Since the physics of air entrainment is not yet clearly understood, most of the fire plume expressions reported in the literature were derived empirically. Experiments with different fire geometry, fuels, and ambient conditions would be difficult when trying to derive comprehensive plume temperature and velocity fields from existing theories. Computational fluid dynamics (CFD), a practical ...
-
Comparison of measured and modelled NO2 values at Zurich airport, sensitivity of aircraft NOx emissions inventory and NO2 dispersion parameters
This paper presents a comparison of modelled and measured annual mean NO2 concentrations around Zurich airport. Modelled concentrations were derived from the LASAT Lagrangian model for the airport and from a Gaussian plume model for the Zurich canton. The measured annual mean NO2 concentrations were monitored at stations within the airport. The modelled airport NO2 concentrations fell below 1 ...
-
Comparison of the inherent data error in plume rise models
Differences between Gaussian model results and observations depend highly on the individual data errors of the parameters considered in the model. For example, errors in the estimated plume rise can be partly explained by the semi-empirical character of its estimation procedures. Nevertheless, inherent data errors keep being important. A mathematical estimate of the expected plume rise error due ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you