G. Tinarelli

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Papers by G. Tinarelli

Modellistica a microscala per la localizzazione delle postazioni di qualità dell'aria

arpa.piemonte.it

RIASSUNTO La presenza di ostacoli naturali o artificiali posti nei pressi delle stazioni di misur... more

Zasavje canyon regional online air pollution modelling system in highly complex terrain - description and validation

International Journal of Environment and Pollution, 2012

ABSTRACT Zasavje is an industrial region in Slovenia located along the Sava River&#39;s steep... more ABSTRACT Zasavje is an industrial region in Slovenia located along the Sava River&#39;s steep canyon where PM10 air pollution is a major problem. In the paper a national project with the title &#39;Prognostic and diagnostic integrated regional air pollution modelling system&#39; is described where it is shown that such a project can significantly contribute to the proper understanding of air pollution in smaller regions with a very complex topography. To achieve online efficiency some new methods to obtain high resolution short-range meteorological fields derived from meso-scale models have been developed and the implementation of the advanced Lagrangian model&#39;s acceleration techniques and novel approaches for the whole system integration is presented. The project&#39;s test-bed was established as a novel approach to the overall treatment of the scientific-applicative project goal.

Environmental impact assessment of a new thermal power plant Šoštanj Block 6 in highly complex terrain

International Journal of Environment and Pollution, 2012

Slovenia is starting an important investment -Block 6 of the thermal power plant in Šoštanj locat... more Slovenia is starting an important investment -Block 6 of the thermal power plant in Šoštanj located in the Velenje basin and characterised by very complex terrain. Air pollution examination as part of the environmental impact assessment is an interesting example of usage of the modern Lagrangian particle model Spray coupled with the diagnostic mass consistent wind field model Minerve for the determination of the appropriate height for the combined cooling tower. In addition, a separate study was done on a larger domain to evaluate possibilities of trans-boundary pollution, as the location is only 25 km from the Austrian border.

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Evaluation of Local-Scale Models for Accidental Releases in Built Environments: Results of the Modelling Exercises in Cost Action ES1006

Springer Proceedings in Complexity, 2016

Testing and evaluating available models by model inter-comparison, as well as by comparison again... more Testing and evaluating available models by model inter-comparison, as well as by comparison against test data from qualified field and laboratory experiments is a main research task of COST Action ES1006. Assuming that a typical emergency response model has already been validated with regard to local-scale dispersion modelling, the existing model evaluation and validation strategies are extended towards task-and application-specific measures for accidental release scenarios, such as extreme value prediction and exposure assessment. In case of a continuous release, maximum concentrations, dosages and especially the area affected by values above a relevant threshold usually are the information expected from an emergency response model. In case of one or several puff releases, additional information may be of interest: When does the puff arrive at a certain point? How long is the duration of the puff passage at a point? What are the peak concentration values to be expected? The model evaluation focuses on the respective model output. In case of one or several puff releases, additional information may be of interest: When does the puff arrive at a certain point? How long is the duration of the puff passage at a point? What are the peak concentration values to be expected? The model evaluation focuses on the respective model output.

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HEAPS: Hyper-model for Environmental Air Pollution Survey

5.26 a New Operational Approach to Deal with Dispersion Around Obstacles: The MSS (Micro Swift Spray) Software Suite

In this paper, a new approach tagged as " 90% of the solution for about 10% of the CPU"... more In this paper, a new approach tagged as " 90% of the solution for about 10% of the CPU" is described. This method allows an exact representation of buildings directly generated by a GIS (as .shp files). A first guess of the 3D mean flow is computed using all available and relevant meteorological data (inside or outside the target domain). This field is then modified using analytical corrections due to the obstacles (Kaplan and Dinar, 1996). At last, the mass consistent field is deduced considering the topography and the filled (or porous) cells representing the buildings. Turbulence is diagnostically deduced considering the distance to the nearest obstacle as a mixing length. This micro-scale quick solution to the flow problem is called Micro SWIFT. Dispersion is simulated through a modified version of SPRAY, a Monte-Carlo Lagrangian dispersion code (Tinarelli et al., 1994), where particles are reflected by the ground and by obstacles, and discretisation time steps are set...

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Simulations of atmospheric dispersion in an urban stable boundary layer

International Journal of Environment and Pollution, 2001

ABSTRACT

Evaluation of a 3-D flow and pollutant dispersion modelling system to estimate climatological groundlevel concentrations in complex coastal sites

by Giuseppe Brusasca and G. Tinarelli

International Journal of Environment and Pollution, 2001

ABSTRACT A three-dimensional modelling system, made by a mass-consistent wind field model and by ... more ABSTRACT A three-dimensional modelling system, made by a mass-consistent wind field model and by a Lagrangian particle model, has been applied to a Mediterranean complex coastal site to describe the atmospheric dispersion of pollutants emitted by a thermal power plant. Different short-term episodes have been simulated to cover the seasonal climate variability. Model results have been compared with local SO&lt;sub align=&quot;right&quot;&gt; 2 measurements showing their reliability in reconstructing space and time concentration variations. Modelling results, together with the statistics of the &#39;&#39;weather type&#39;&#39; associated with each episode, have been used to estimate climatological concentrations for the considered site. The latter methodology can be proposed to assess the air quality in complex areas.

A simple way of computing buoyant plume rise in Lagrangian stochastic dispersion models

by Giuseppe Brusasca and G. Tinarelli

Atmospheric Environment. Part A. General Topics, 1993

... In fact, some comparisons with: (i) analytical plume rise solutions, (ii) qualitative nu meri... more

Intercomparison of Lagrangian stochastic models based on two different PDFs

International Journal of Environment and Pollution, 2000

ABSTRACT

Lagrangian Model Simulation of 3-D Concentration Distribution in Complex Terrain

Air Pollution Modeling and Its Application X, 1994

Assessment of Pollution Impact Over Turin Suburban Area Using Integrated Methods

Air Pollution Modeling and Its Application XV, 2004

Close to the southern boundary of the city of Turin, in Northern Italy, the Province of Turin, on... more Close to the southern boundary of the city of Turin, in Northern Italy, the Province of Turin, one of the local authorities involved in the air pollution management, has started activities including the development of emission inventories and the use of dispersion models. The overall scope of this project is to cross check the emission inventory and dispersion model reliability,

Particle modeling simulation of atmospheric dispersion using the MC-LAGPAR package

by Giuseppe Brusasca and G. Tinarelli

Environmental Software, 1987

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Particle model simulation of diffusion in low wind speed stable conditions

by Giuseppe Brusasca and G. Tinarelli

Atmospheric Environment. Part A. General Topics, 1992

A~traet--A Lagrangian particle model (LAMDA), previously developed and applied to the simulation ... more A~traet--A Lagrangian particle model (LAMDA), previously developed and applied to the simulation of atmospheric dispersion in neutral and convective windy conditions, was modified to deal with stable low wind speed conditions. These last are among the most difficult to be treated. In fact, on the one hand, nearly calm situations, associated to strong stability and air stagnation, make the lower layers of the atmosphere poorly diffusive, and, on the other hand, the large fluctuations in the wind direction (meandering), spread the airborne pollutants over wide angular sectors. An ad hoc algorithm to simulate the effect of meandering on the dispersion is proposed. The model is validated by comparing its simulation results to three tracer experiments held in stable low wind speed conditions by the Idaho National Engineering Laboratory (U.S.A.) in 1974. These experiments present plume spread of different width (48, 138 and 360 °, respectively, at an arc located 200 m downwind from the source) and are comprehensive of a wide set of conditions, ranging from strong to weak stability and from low wind speed to calm. The results of the comparison are discussed. The ability of the model to simulate the g.l.c, distributions with a good degree of confidence is illustrated.

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Comparison between the results of a Monte Carlo atmospheric diffusion model and tracer experiments

by Giuseppe Brusasca and G. Tinarelli

Atmospheric Environment (1967), 1989

Lagrangian statistical (Monte Carlo) model for airborne pollutant dispersion is presented. Its ab... more Lagrangian statistical (Monte Carlo) model for airborne pollutant dispersion is presented. Its ability to simulate the atmospheric dispersion both in homogeneous and inhomogeneous turbulence by comparison with an analytical solution and with the Willis and Deardofl water tank experiments, respectively, has been stated in previous papers. In the present paper the model is used to simulate dispersion in the real atmospheric PBL. The numerical results obtained are verified against experimental data from the Karlsruhe Nuclear Research Center tracer experiments. The model is applied to the problem of predicting the ground level concentration of two different tracers simultaneously released from two heights (160 and 195 m) at the Karlsruhe meteorological tower. Convectively unstable and neutral conditions were prevailing during the two tracer experiments which have been simulated. Model performance was evaluated through two statistical indexes: relative mean bias and normalized mean square error. The cumulative frequency distribution of the point-by-point ratio between observed and predicted ground level concentrations (glcs) was also computed. The simulated concentrations agree very well with observations. The tracer data were also compared to the simulations of 10 Gaussian models. They differed one another for the choice of dispersion sigma curves and for the way to insert the wind speed and direction. None of them proved to perform better than our particle model in all the exercises. Key word index: Atmospheric diffusion, particle trajectories model, air quality model evaluation.

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A Comparison of Different Modelling Techniques to Evaluate Atmospheric Dispersion of Pollutants in Complex Coastal Sites

by Giuseppe Brusasca and G. Tinarelli

The performances of the Lagrangian particle model SPRAY and the US EPA regulatory model ISC3ST (U... more The performances of the Lagrangian particle model SPRAY and the US EPA regulatory model ISC3ST (US) have been intercompared in two applications dealing with industrial emissions at coastal sites. The two considered models have been applied to reconstruct climatological ground level concentrations around the thermal power plants of Fusina, nearby Venice, and Vado Ligure. The former site is characterised by flat terrain and shows the climatological features of the north-western Adriatic Sea coasts, with local scale circulations like sea/land breezes having a limited statistical frequency. The latter site is located on the Ligurian coast and it is characterised by very complex terrain and a climatology dominated by the superposition of land/sea breezes and slope flows. In Venice, the two models give similar results for both long term average concentrations and daily average percentiles. Relevant differences have been observed only for very high (over 98 th ) hourly average percentiles and maximum values. On the contrary, at the more complex Vado Ligure site the two modelling systems produced different results that are hardly comparable. The reliability of the downscaling of synoptic weather data to the local scale to drive air pollutant dispersion models in complex coastal conditions, has been evaluated through the application of a mesoscale prognostic model. Grid nesting technique has been used to enhance space resolution from the meteorological analysis grid size (0.5 deg.) to the target resolution of 1 km. The prognostic non-hydrostatic model RAMS (Pielke et al., 1992) has been used as the meteorological driver for the Lagrangian particle model SPRAY. The results of earlier modelling applications on the site of Vado Ligure offered the possibility to compare diagnostic and prognostic meteorological codes. This comparison has been extended to the pollutant concentration produced by the same dispersion model driven by the two different meteorological approach. The overall results obtained by the two modelling systems seem to be comparable.

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Mesoscale Flow and Pollutant Dispersion Modelling from Industrial Emissions at a Complex Mediterranean Site

by U. Pellegrini and G. Tinarelli

Integration of Measurement and Modelling Systems to Reconstruct Pollution Impacts Around the Industrial Area of Priolo (Sicily)

Simulation of atmospheric dispersion in the convective boundary layer: comparison between two Lagrangian particle models

by Giuseppe Brusasca and G. Tinarelli

ABSTRACT The results obtained in convective boundary layer dispersion by two Lagrangian particle ... more ABSTRACT The results obtained in convective boundary layer dispersion by two Lagrangian particle models (according to Thomson&#39;s 1984 and 1987 papers) are compared. First, the sensitivity of the two models in accounting for the third-order moment of vertical wind speed fluctuations has been assessed, considering homogeneous non-Gaussian turbulence. Then, the ability of the two models to simulate the ground-level concentration field has been tested, by comparing their predictions with tracer data measured in two experiments. The first is one of the well-known water tank experiments performed by Willis and Deardorff in 1978, the second is the Katrex field experiment (Thomas et al., 1983). The results obtained in the case of the controlled conditions seem to recommend the use of the model based on Thomson&#39;s 1987 paper, whereas the performances of both models are comparable in simulating a real case.

Review and Validation of MicroSpray, a Lagrangian Particle Model of Turbulent Dispersion

Geophysical Monograph Series, 2012

ABSTRACT In this paper, the MicroSpray 3-D Lagrangian particle dispersion model is presented and ... more ABSTRACT In this paper, the MicroSpray 3-D Lagrangian particle dispersion model is presented and reviewed, and several validation studies are shown. Starting from its core, based on a 3-D form of the Langevin equation for the random velocity, the successive developments of different modules treating the main physical processes that determine the atmospheric pollutant dispersion are illustrated. Different prob- ability density functions are implemented to estimate the deterministic coefficient in the Langevin equation. Buoyancy effects are described through simplified plume rise formulations up to a complete set of equations for negatively and positively buoyant emissions, also including phase changes. MicroSpray is able to simulate different types of sources and emissions; it includes the treatment of obstacles and complex orography and offers several options to optimize the numerical runs. The model can be driven both by diagnostic and prognostic atmospheric models, and it has been used and validated in a variety of cases, from experimental to real conditions. Some significant examples of MicroSpray simulations are detailed and discussed.

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