dispersion model validation Articles

  • Validation of the Urban Dispersion Model (UDM)

    The Urban Dispersion Model (UDM) was developed to satisfy a need of the UK Ministry of Defence to predict the dispersion of atmospheric pollutants within the urban environment. It is being subjected to an extensive validation and verification programme, which includes comparing model predictions against a comprehensive selection of measurements drawn from a database of field experimental trials. ...


    By Inderscience Publishers

  • Intercomparison of Lagrangian dispersion models and validation with Lillestrom data

    Three different Lagrangian models (KLIMM-L, LASAT and STOER.LAG) are applied to the Lillestrom datasets. A pre-processing of the required vertical wind-profiles unifies the flow fields for the three models. In the framework of harmonisation the models show partial agreement with the datasets. The discrepancies are the same for all models. One reason for deviation of the datasets might be locally ...


    By Inderscience Publishers

  • Validation of atmospheric dispersion models using ETEX data

    Two models frequently used to simulate the dispersion of pollutants in the atmosphere have been compared. This is necessary because only a well-tested and well-calibrated simulation model can be a good representation of the reality of the dispersion of pollutants. The models evaluated (HYSPLIT_4 with its four variants and MEDIA) were run using as input parameters the same meteorological dataset ...


    By Inderscience Publishers

  • A dataset for the validation of flow and dispersion models at an urban intersection

    Dispersion modelling concerning air pollution caused by road traffic is reduced to a two-dimensional problem within street canyons. However, significant pollution loads are also to be expected at intersections. In this case, three-dimensional flow and dispersion structures have to be considered. For the validation of models claimed to be applicable to intersections, measurements of meteorological ...


    By Inderscience Publishers

  • 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 ...


    By Inderscience Publishers

  • Quality control in dispersion modeling: Validation of a screening model for PM10 and NO2

    European air quality guidelines require gathering information about air quality at locations where the population is affected or possibly affected by high concentrations. High concentrations are often found in densely built up streets with high traffic loads. In order to identify these hot spots and to assess possible measures to improve the situation, screening models are widely applied in ...


    By IVU Umwelt GmbH

  • Validation of the dispersion model CAR-FMI against measurements near a major road

    A field measurement campaign was conducted near a major road in southern Finland from 15 September to 30 October 1995. The concentrations of NO, NO2 and O3 were measured simultaneously at three locations, at three heights (3.5, 6 and 10 m) on both sides of the road. The relevant meteorological parameters and traffic densities were also measured on site. We have ...


    By Inderscience Publishers

  • Recent studies to validate and compare atmospheric dispersion models for regulatory purposes in the UK

    Some results are presented for recent studies to develop new approaches for (i) validating atmospheric dispersion models using crosswind concentration transects, and (ii) summarising and comparing the predictions of models across a range of efflux and meteorological conditions.Keywords: crosswind concentration, dispersion climate, dispersion modelling, ...


    By Inderscience Publishers

  • Validation of the Demokritos dispersion modelling system based on the Indianapolis experiment

    To assess the ability of a model to simulate atmospheric dispersion, its performance must be tested using data from real field experiments. This paper presents the results of a validation study of the atmospheric dispersion model Dispersion over Complex Terrain (DIPCOT) against data from the Indianapolis field experiment. Three different modules of the dispersion code are examined a puff model, a ...


    By Inderscience Publishers

  • Datasets and protocol for model validation

    Prior to the present workshop, a so-called Model Validation Kit was distributed to approximately 40 research groups who were invited to test their own dispersion models with it. The Kit is a collection of three experimental datasets accompanied by software for model evaluation. It is a practical tool, meant to serve as a common frame of reference for modellers. Here, a brief description of the ...


    By Inderscience Publishers

  • A dispersion model intercomparison archive

    The paper introduces a formal archive for intercomparison of conventional regulatory dispersion models. It stems from an initial intercomparison, for the UK Environment Agency, of the USEPA's ISC and AERMOD models with the ADMS model, in common use in the UK. The objective is to compare the models directly with one another via standard test cases in order to reveal differences that may arise in ...


    By Inderscience Publishers

  • The Model Validation Kit - status and outlook

    Over the past few years, the so-called Model Validation Kit has been the basis for much work on evaluation of atmospheric point source dispersion models. The kit has recently been enhanced with a supplement which represents urban conditions (experimental data from Indianapolis, USA). A change of methodology is under consideration, based on the concept of near centreline concentrations. The paper ...


    By Inderscience Publishers

  • Validation of models AEROFOUR and AEROPOL using the model validation kit established at Mol

    The AEROPOL and AEROFOUR dispersion models developed at Tartu Observatory (Estonia) are validated using the Lillestrom dataset and following the model comparison rules established at the workshop in Mol. Running the AEROFOUR model, the vertical wind and temperature co-variations not included into the official dataset were used. The computed and measured arc-wise maximum and crosswind integrated ...


    By Inderscience Publishers

  • Atmospheric dispersion and individual exposure of hazardous materials. Validation and intercomparison studies

    In a previous study, new approaches have been introduced in the CFD-RANS modelling, according to which the concentration time scales are estimated as a function not only of the flow turbulence time scales but also of the pollutant travel times. The new approaches have been implemented for the calculation of the concentration fluctuation dissipation time scale and the maximum individual exposure ...


    By Inderscience Publishers

  • Model Validation Kit - recent developments

    Over the past few years, the so-called Model Validation Kit has been the basis for much work on model evaluation. The ground is presently being prepared for further development of the kit. Based on data from the Kincaid experiment investigations have been carried out in order to illuminate features and problems with a methodology for model evaluation proposed in the context of the ASTM. Certain ...


    By Inderscience Publishers

  • 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). ...


    By Inderscience Publishers

  • Validation study of the dispersion Lagrangian particle model DIPCOT over complex topographies using different concentration calculation methods

    In this paper, the Lagrangian particle dispersion model DIPCOT is evaluated by simulating two dispersion experiments over highly complex topographies (the TRANSALP90 and the ETEX experiments). The resulting predicted concentrations were compared with the experimental ones using some well-known performance indices and various types of plots. Furthermore the model results are compared to the ...


    By Inderscience Publishers

  • High-resolution wind-tunnel datasets from the University of Hamburg: validation of street canyon dispersion models

    Air quality is one of the major environmental concerns in cities as it has a direct impact on human health. One of the biggest sources of air pollution is urban traffic. To predict air quality in urban areas, significant effort and considerable funding has been, and is being, spent in developing numerical models for urban dispersion and in obtaining experimental datasets. So far, less effort has ...


    By Inderscience Publishers

  • The SMEDIS database and validation exercise

    SMEDIS is an ongoing research project funded by the European Union under the Environment and Climate Research Programme for the period 1996-1999. The project is coordinated by the Health and Safety Executive (HSE, UK) with two other main partners Cambridge Environmental Research Consultants (CERC, UK) and Electricite de France (EDF, France). Ten additional partners from across Europe are also ...


    By Inderscience Publishers

  • Validation of the ADMS dispersion model and assessment of its performance relative to R-91 and ISC using archived LIDAR data

    Regulatory authorities have traditionally used Gaussian dispersion models, notably R-91 in the UK and ISC in the USA. These use dispersion coefficients derived from the Pasquill stability category calculated for the prevailing meteorological conditions. Recently, ADMS (Atmospheric Dispersion Modelling System) has been developed; this is one of a new generation of dispersion models in which the ...


    By Inderscience Publishers

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