dispersion modeling atmospheric Articles
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Measurement and mathematical modelling of odor gases in a collagen and gelatine plant - Case Study
The objective of this study was to identify and quantify odor sources throughout the production process of a gelatine and collagen factory located in the interior of Paraná State, Brazil. At the same time, an atmospheric dispersion model was used to identify the radius of coverage and the frequency of perceived values of odor around the company and, thus, propose improvements of control ...
By ENVEA
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Inverting time dependent concentration signals to estimate pollutant emissions in case of accidental or deliberate release
We test the reliability of an inverse model to estimate the amount of mass released instantaneously by a source of pollutant in a turbulent boundary layer. To that purpose we use wind tunnel experiments simulating the dispersion of puffs due to the impulsive release of pollutant. For each of these emissions we recorded time dependent signals at fixed receptors. These single signals have been ...
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The use of probabilistic plume predictions for the consequence assessment of atmospheric releases of hazardous materials
Toxic load-based toxicity models have been increasingly applied to model the effects of atmospheric releases of hazardous materials. Although the majority of atmospheric transport and dispersion models predict only a ‘mean’ plume, real-world personnel are exposed to one of many possible individual realisations of a plume, and never to a ‘mean’ plume. Hazard prediction assessment capability ...
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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 ...
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Sensitivity analysis of the modelled deposition of 137 Cs on the Japanese land following the Fukushima accident
Dispersion of radioactive material released to the atmosphere from the Fukushima Daiichi Nuclear Power Plant accident in Japan was modelled to assist the French Government in effectively providing public health advice to its citizens in Japan. It required estimation of radiation doses based on realistic scenarios and atmospheric dispersion modelling. In this paper, sensitivity studies are ...
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Calculation of the far range atmospheric transport of radionuclides after the Fukushima accident with the atmospheric dispersion model MATCH of the JRODOS system
The paper presents estimates of the far-range atmospheric dispersion of radionuclides after the accident at Fukushima Daiichi Nuclear Power Plant (NPP), obtained using the long-range atmospheric dispersion model MATCH. Software tools were developed to run MATCH in the EU nuclear emergency response system JRODOS using freely available numerical weather prediction (NWP) data of the Global ...
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Local PM10 source apportionment for non-attainment areas in Slovakia
The method used for the PM10 source apportionment in 18 air quality management areas (AQMAs) in Slovakia is presented, as well as the results of the study. Local PM10 emissions include traffic emissions, local seasonal heating sources from residential housing, industrial and point sources, and fugitive sources. Mathematical modelling has been performed using CALPUFF model, driven by ...
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Towards a new scheme for parametrisation of deep convection in NAME III
This paper describes an updated scheme for parametrisation of atmospheric convection to be used in the Met Office Atmospheric Dispersion Model (NAME III). In this scheme, the vertical transport of particles due to convection is represented in a 1-dimensional model based on a ‘mass-flux’ approach. Empirical formulas are used to obtain the mass fluxes and the convective precipitation is used for ...
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White Paper: Managing Odour Complaints Best Practices
There are many ways to deal with Odour complaints, either proactively or reactively. Odours are not predictable, but you can manage them, if you receive a complaint. Here are some suggestions: Encourage odour complainants to notify the plant as soon as possible after an odour episode and fill out a standard questionnaire with details about the odour episode such as date, time, ...
By ORTECH
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ADMS 5 Buildings Validation Warehouse Fires Wind Tunnel Experiments
1 Introduction In 1996. results from the CERC Atmospheric Dispersion Model. ADMS 2 were validated against experimental wind tunnel data of dispersion from chemical warehouse fires [1]. The original experimental data used to validate the model were presented in a Building Research Establishment Client Report [2]. Here, results from ADMS 5.0 (version 5.0.0.0) are validated against these ...
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ADMS 5 Flat Terrain Validation Kincaid, Indianapolis and Prairie Grass
1 Introduction This document presents a summary of ADMS model results compared against three well known field data sets: Prairie Grass. Kincaid and Indianapolis. Results are also presented for two U.S. models: ISCST and AERMOD. ISC ST is the United States Environmental Protection Agency model. It is a so-called 'old generation' model, similar to the UK R-91 model, based on the 1970's ...
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A simple methodology for surface layer characterization during diabatic extremes
Abstract Increased global environmental awareness has fostered widespread use of remote automated weather station (RAWS) networks to monitor meteorological conditions, and reliance on atmospheric dispersion modeling for decisions concerning pollutant dispersion. Dispersion models require as input a characterization of surface layer (SL) heat and momentum fluxes and turbulence. Characterization ...
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ADMS–Urban: developments in modelling dispersion from the city scale to the local scale
Many countries perform national air quality assessments using grid–based numerical air dispersion models, generally referred to as 'regional' models. Advantages of these models include the ability to use temporally and spatially varying meteorology and model chemical reactions over large temporal and spatial scales. These models usually perform reasonably well against rural and urban background ...
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Calculations of external irradiation from radioactive plume in the early stage of a nuclear accident
A mathematical method for real–time calculations of cloudshine doses/dose rates used for purposes of online assimilation of model predictions with observations incoming from terrain is proposed. Model predictions of cloudshine doses have to be calculated simultaneously in an array of positions located on terrain around a nuclear facility. A modification of the classical straight–line Gaussian ...
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Estimates of lateral dispersion parameters in low wind speed conditions
Wind speed time series recorded during stable low wind speed conditions are typically non–stationary, with large horizontal oscillations, commonly known as meandering. In this paper, two wavelet–based methods are proposed to obtain lateral dispersion coefficients from such time series. These methods, associated with a specific wind model, have been tested by using wind velocities recorded, with ...
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Pollutant dispersion over two–dimensional idealised urban roughness: a large–eddy simulation approach
A series of two–dimensional (2D) street canyon models with a wide range of building–height–to–street–width (aspect) ratios are employed in this study to elucidate the pollutant transport over idealised urban areas. The large–eddy simulation (LES) is used to resolve the turbulent flows and pollutant transport in the urban boundary layer (UBL) over the street canyons. The results show that the ...
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Lagrangian modelling evaluation of the NOx pollution reduction due to electric vehicles introduction
In this paper, the problem of the atmospheric pollution due to the traffic emission from a large freeway is faced. To this aim, numerical simulations were performed and compared with measured data in a real case. The Lagrangian particle model includes a simple chemical scheme for the reactions between NOx and ozone. The results, compared with a field experiment taken in the literature, show that ...
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Sensitivity of ozone and aerosols to precursor emissions in Europe
We modelled the air quality in Europe during January and June 2006 using the MM5/CAMx model system and studied the sensitivity of ozone and aerosol formation to precursor emissions. Increased isoprene emissions by a factor of four in summer caused an increase in afternoon ozone by up to 10%. On the other hand, the effect on secondary organic aerosols (SOA) was very small. Reductions in NOx ...
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Modelling emission, concentration and deposition of sodium for Poland
The aim of this paper was to calculate natural and anthropogenic emission of Na+ and to estimate, with the FRAME model, annual air concentration and deposition of Na+ for the domain covering Poland. Calculations of natural emissions included marine emission and wind blown dust from land. Anthropogenic emission was calculated for both point and area sources. Emission maps were used in fine ...
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Atmospheric transport model applied to understand the effect of biogenic emissions to secondary atmospheric aerosol in hemiboreal zone
The SILAM model with built–in isoprene and monoterpene emission module from natural sources was run for May to August 2006 in Baltic Sea region. In this study VOCs were advected as passive tracers. Modelled hourly VOC–tracer concentrations were compared with sub–half–micrometre aerosol concentrations, simultaneously measured in Preila (Lithuania), Tahkuse (Estonia), Hyytiälä (southern Finland) ...
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