plume modeling Articles

192 Results found
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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 ...

A Lagrangian stochastic model for estimating the high order statistics of a fluctuating plume in the neutral boundary layer

by Inderscience Publishers  (Oct. 16, 2014)

We use a Lagrangian stochastic micromixing model to predict the concentration fluctuations of a continuous release in a neutral boundary layer. We present the computational algorithm that implements the interaction by exchange with the conditional mean model and we compare the numerical solutions with the experimental values in order to evaluate ...

Numerical simulation of aerosols in an aircraft wake using a 3D LES solver and a detailed microphysical model

by Inderscience Publishers  (Oct. 28, 2014)

The global impact of aviation on the atmosphere is generally determined using the total amount of gas and particulate matter emitted at the aircraft engine exit but generally ignore some of the physical transformations occurring at much smaller scales in the aircraft wake. In this work, we present an offline alternative method based on the use of ...

Comparison of hazard area and casualty predictions of a small-scale chemical attack using various toxic load toxicity models

by Inderscience Publishers  (Oct. 16, 2014)

It has been observed that the toxic load model can better account for toxic effects from chemical exposures than Haber’s law. However, the toxic load model has been experimentally validated only for steady exposures. We compare four proposed extensions of the toxic load model to the case of time-varying exposures. We conclude that the choice of ...

Support to Aviation Control Service (SACS): an online service for near-real-time satellite monitoring of volcanic plumes

by NILU - The Norwegian Institute for Air Research  (May 16, 2014)

Volcanic eruptions emit plumes of ash and gases into the atmosphere, potentially at very high altitudes. Ash-rich plumes are hazardous for airplanes as ash is very abrasive and easily melts inside their engines. With more than 50 active volcanoes per year and the ever-increasing number of commercial flights, the safety of airplanes is a real ...

Comparative study of fecal bacterial decay models for the simulation of plumes of submarine sewage outfalls

by IWA Publishing  (Aug. 8, 2013)

In the literature, analytical models have been shown to be extremely useful for estimating the decay rates of coliform as fecal indicator microorganisms, providing reliable predictions of bathing conditions in coastal and continental waters. Although a number of different formulations have been developed in the literature, each one may only be ...

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 ...

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 ...

Ocean outfall plume characterization using an autonomous underwater vehicle

by IWA Publishing  (Jan. 11, 2013)

A monitoring mission to map and characterize the Point Loma Ocean Outfall (PLOO) wastewater plume using an Autonomous Underwater Vehicle (AUV) was performed on 3 March 2011. The mobility of an AUV provides a significant advantage in surveying discharge plumes over traditional cast-based methods, and when combined with optical and oceanographic ...

Calculations of external irradiation from radioactive plume in the early stage of a nuclear accident

by Inderscience Publishers  (Dec. 28, 2012)

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 ...

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