pollution modeling Articles
-
State of the art of air pollution models, needs and trends
This paper summarises the results of the investigations within task MA3-2 carried out by the European Topic Centre on Air Quality. The main aim of this task is to describe the state of the art of air pollution models, with special emphasis on needs for model application and trends in model development. From the results it can be inferred to what extent the needs are met by available models and ...
-
Book Review: Artificial Neural Networks in Vehicular Pollution Modelling by Mukesh Khare and S.M. Shiva Nagendra
Artificial Neural Networks in Vehicular Pollution Modelling, by Mukesh Khare and S.M. Shiva Nagendra. Springer, 2007. 242 pp. ISBN 3-540-37417-5Keywords: book ...
-
Air pollution modelling, sensitivity analysis and parallel implementation
A new approach for Sensitivity Analysis (SA) in the field of air pollution modelling is proposed and applied to the Unified Danish Eulerian Model (UNI-DEM), a large-scale air pollution model. The SA requires numerous model experiments with different values of the studied parameters. By simultaneous variation of these parameters we produce a set of multidimensional discrete functions. These huge ...
-
Different splitting techniques with application to air pollution models
Splitting techniques are commonly used when large-scale models, which appear in different fields of science and engineering, are treated numerically. Four types of splitting procedures are defined and discussed. The problem of the choice of a splitting procedure is investigated. Several numerical tests, by which the influence of the splitting errors on the accuracy of the results is studied, are ...
-
Performance results of a large-scale air pollution model on two parallel computers
The size of the computational task obtained after the appropriate splitting and discretisation procedures of the system of partial differential equations in large air pollution models is enormous. Even when computers with several GFLOPS top performance are in use, it is difficult to solve this problem efficiently and, furthermore, to prepare codes that can be used for operating purposes. Some ...
-
An evaluation and comparison of the various statistical and deterministic techniques for forecasting the concentration of criteria air pollutants
A statistical approach is about working through the historical data in a general way and finding guides to future behaviour. In the present study, forecasting of the criteria pollutants has been done using simple statistical techniques and attempt has been made for an inter-comparison of these techniques with various advanced statistical and deterministic techniques. The inter-comparison analysis ...
-
Evaluation of a non-Gaussian puff model
This paper presents the evaluation of a model based on a general technique for solving the K-equation using the truncated Gram-Charlier expansion (type A) of the concentration field and a finite set of the equations for the corresponding moments. The model can be applied routinely using simple ground-level meteorological data acquired by an automatic network as input. A performance evaluation is ...
-
Using a calculation model to prevent serious air pollution from traffic
The municipality of Utrecht has ten years of experience with exceeding the pollution limit values for NO2 and benzene, and offering advice for traffic plans on the effects of air pollution. Utrecht promotes prevention and integration of environmental issues in traffic plans and town planning. Utrecht has widened the use of the Dutch air pollution model for traffic (CAR) to prevent new exceeding ...
-
Impact of future climate changes on high pollution levels
Changes in climate variability as well as changes in extreme weather and climate events in the 20th century, especially those that took place during the last two to three decades of the 20th century, have been discussed in many recent scientific publications. Attempts to project the results of such studies in the future have been made under different assumptions. In this paper, we have chosen one ...
-
Comparison between analytical models to simulate pollutant dispersion in the atmosphere
We present a numerical and statistical comparison between ADMM and GILTT approaches to simulate pollutant dispersion in the Planetary Boundary Layer (PBL). The numerical and statistical comparison of the ADMM and GILTT results confirms the equivalence of these methods. However, the ADMM approach is more efficient under computational point of view regarding the issue of computational time and, ...
-
A survey of material flows in economic models
Various types of economic model address environmental problems. This article examines whether these can be applied to the analysis of material flows. It is important to know which types of model are most suitable to deal with particular economic, environmental or physical aspects of material flows. For this purpose five main categories of models are considered, namely economic models of natural ...
-
Traffic pollution modelling in a complex urban street
This study explores for the first time, the applicability of the Danish Operational Street Pollution Model (OSPM) in the city of Buenos Aires where street canyons are very irregular. The model is applied in an irregular and asymmetric street canyon of a five–lane avenue near a street intersection. Urban background concentrations estimated by the DAUMOD model are considered. Meteorological ...
-
Modelling and simulation framework for pollution control of chemical processes
During process design, it is possible to evaluate and control pollution that might occur during actual operation. This paper presents computer-aided design framework that enables the design team to define process design model elements and to measure possible pollution at each design step using performance indexes of pollution measures as mapped to process variables. Modelling methodology, called ...
-
The European long-range tracer experiment, ETEX: a database for comparing model results and for harmonisation purposes
This report presents the layout and a summary of preliminary results of the European tracer experiment (ETEX), which was devised to serve several purposes, one of which was to create a database for long-range modelling.Keywords: long-, range tracers, atmospheric transport, tracer experiments, atmospheric dispersion models, air pollution, environmental pollution, ...
-
A model for the dispersion of puffs into the planetary boundary-layer
A model for the dispersion of Gaussian puffs into the planetary boundary-layer is presented. The model relies on the relative diffusion theory in which the rate of expansion of the puff is expressed in terms of the spectral properties of turbulence. A new spectral formulation for the turbulent velocities is used, which is valid for different stability conditions ranging from stable to convective. ...
-
Artificial neural network based vehicular pollution prediction model: a practical approach for urban air quality prediction
The achievement of local air quality management goals in densely populated built-up urban areas often requires short-term air quality plans or emission management policies. Vehicular pollution modelling is an effective tool in managing the vehicular exhaust emissions in urban environments. In the recent past, Artificial Neural Network (ANN) based vehicular pollution models are found to be useful ...
-
The air quality Model Documentation System of the European Environment Agency
With the aim of providing objective, reliable and comparable information on air pollution models, the European Topic Centre on Air Quality (ETC/AQ) has developed a concept for an air quality Model Documentation System (MDS) to be accessible on the internet. The aim of the system is to include adequate information on the individual models, their application areas, and their status with respect to ...
-
Annual simulation of secondary pollution over northern Italy
A secondary pollution modelling system for simulating airborne dispersion and chemical reactions is applied over a regional scale domain located in the North-West of Italy, where urban and industrial areas are present. It was found an overestimation of NO2 in the urban areas, probably due to an underestimation of the vertical diffusivity; the analysis of OX confirms that the discrepancies in O3 ...
-
Coupling of neural network and dispersion models: a novel methodology for air pollution models
Supervised neural net models and dispersion models are two important approaches for evaluating air pollution concentrations. The authors propose the development of an integrated model, in order to optimise the performances of each methodology. The concentrations evaluated by an air pollution model are coupled with a Neural Net (NN), so as to adjust the influence of important variables on ...
-
The ADMS building effects module
We describe the features required of practical models for building-affected dispersion and the modelling used in ADMS to provide them. We go on to illustrate the model's capabilities through sensitivity studies and comparisons with data.Keywords: atmospheric dispersion models, building effects, concentrations, air pollution, environmental pollution, ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you