plume modeling Articles

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A simple and practical model for reactive plumes

by Inderscience Publishers  (Jan. 26, 2004)

Pollutants emitted from industrial stacks can be transformed by chemical reactions. An interesting case is the NO to NO2 conversion due to reactions with the ambient ozone. A simple and practical model has been developed to calculate this conversion in the vicinity of the source. Spatial distributions of the reactive species concentrations in the ...

Characterising uncertainty in plume dispersion models

by Inderscience Publishers  (Sep. 1, 2005)

For management decisions related to effects of releases of toxic chemicals, it is useful to consider not only the expected or most likely impact of the release, but also the envelope of possible outcomes, the latter of which involves an assessment of the uncertainty in the modelling results. In this paper, we provide quantitative estimates of ...

Gaussian plume modeling of contaminant transport

by Springer  (Nov. 18, 2005)

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 ...

Theory, Modeling, and Measurements of Gas Plumes

by D&P Instruments  (Jan. 1, 2003)

Abstract Spectroscopic measurements of infrared CO2 transitions in gas plumes are reported, and evaluated for their potential to yield a reliable remote sensing technique for determination of plume temperature. Measurements were made on two types of plumes: a sideways-directed plume from a vehicle exhaust, and a stack plume from a propane-burning ...

A fluctuating plume model for pollutants dispersion with chemical reactions

by Inderscience Publishers  (Oct. 13, 2012)

A fluctuating plume model for pollutant dispersion is developed. The model is able to include chemical reactions, accounting for segregation. The model is tested against measured data in wind tunnel experiment, where NO is emitted from a source in an environment of ozone. The results are presented in terms of the plume centre line dispersion and ...

Comparison of the inherent data error in plume rise models

by Inderscience Publishers  (Jan. 26, 2004)

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 ...

The plume model MODIS: integration in the Hydro-Quebec shell

by Inderscience Publishers  (Sep. 17, 2009)

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, ...

Plume dispersion in the wake of a rectangular model building

by Inderscience Publishers  (Dec. 9, 2008)

A field experiment was specifically designed and conducted to investigate the width of the near-wake recirculation region of a wide and slender model building. Tracer gas was released from the centre of the leeward side of the building. The results suggested that the width of the wake ranged between 0.6 and 1.1 W in the case of the wind normal to ...

Using plume rise schemes to model highly buoyant plumes from large fires

by Inderscience Publishers  (Feb. 8, 2011)

The atmospheric dispersion model Numerical Atmospheric-dispersion Modelling Environment (NAME) is used to simulate the smoke plume from the explosion at the Buncefield oil depot. Simple modelling, in which the plume rise is included through an effective elevated source term, captures the transport and spread of the plume well. More complex ...

Comparison of predictions of the Hybrid Plume Dispersion Model with observations at the Kincaid power plant

by Inderscience Publishers  (Sep. 17, 2009)

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 ...

Model comparison in simulating the atmospheric dispersion of a pollutant plume in low wind conditions

by Inderscience Publishers  (Oct. 13, 2012)

This study investigates the performance of different air pollution dispersion models in low wind conditions. The models have been applied to two sites frequently characterised by weak winds: the cities of Modena and Reggio Emilia, in the Po River Valley (Northern Italy). The emission sources are the municipal waste incinerator (Modena) and a ...

On formulating equations for plume spreads for near-surface releases

by Inderscience Publishers  (Oct. 16, 2014)

Recent concerns about effects of automobile emissions on the health of people living close to roads have motivated an examination of models to estimate dispersion in the surface boundary layer. This examination led to new formulations for horizontal and vertical plume spread described in Venkatram et al. (2013). Concentration estimates based on ...

About the plume rise description in the dispersion code SAFE_AIR

by Inderscience Publishers  (Jan. 26, 2004)

SAFE_AIR is a code simulating the transport and diffusion of airborne pollutants. This code is based on the advection of Gaussian segments and puffs driven by a 3-D wind field produced by a diagnostic model, able to deal with both non-stationary and inhomogeneous conditions. SAFE_AIR is an evolution of the AVACTA II code, "recommended" ...

Accounting for effects of wind rotation in the PBL on the plume characteristics

by Inderscience Publishers  (May 11, 2004)

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 ...

Numerical Simulations on Aerodynamics of Thermally Induced Plumes

by SAGE Publications  (Mar. 1, 2008)

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. ...

Groundwater Contamination Plume Remediation - Case Study

by Solinst Canada Ltd.  (Sep. 24, 2015)

19 CMT Multilevel Systems Successfully Installed in Challenging  A facility in Pontypool, Wales, UK was once the location of a plastic forming plant. Over time, chemicals produced through the plastic forming processes were lost into the groundwater beneath the facility, creating a large contaminant plume. Years later it was determined that ...

3 Ways to Optimize Your EHS Data

by Antea Group - USA  (Jul. 18, 2016)

See What You've Been Missing As consultants, we’re always looking to find the most efficient ways to understand our project site data and maximize our understanding of the conditions and processes in the subsurface. Understanding data begins with quality data management, but it's important to have a streamlined process for providing data in ...

FTIR gas analyzers support management of fire at UK waste facility

by Gasmet Technologies Oy  (Jul. 6, 2016)

The capability to convene a multi-agency Air Quality Cell (AQC) was established in England in 2009 following the Buncefield Oil Storage Depot incident. A review of this event identified the need to rapidly co-ordinate the acquisition, analysis and interpretation of air quality data in major incidents.  Arrangements have been made in England ...

Model evaluation of the Austrian Gaussian plume model ON M 9440: comparison with the Copenhagen and the Lillestrom datasets.

by Inderscience Publishers  (Sep. 15, 2009)

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 ...

Simulation of plume dispersion using different stack configurations and meteorological inputs

by Inderscience Publishers  (Dec. 1, 2014)

The application of CALMET/CALPUFF modelling system is well known, and several validation tests were performed until now; however, most of them were based on experiments with a large compilation of surface and aloft meteorological measurements, not always available. Also, the use of an operational large smokestack as tracer source is not so usual. ...

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