Search results for "Urban surface"

showing 3 items of 3 documents

Experimental data collection and modelling of dry deposition velocities for urban surfaces

2018

Dry deposition process is recognized as an important pathway among the removal processes of radioactive pollutants in atmosphere. There is not a unique and accepted theoretical description of involved dry deposition phenomena due to the complexity of the fluid-dynamic processes that influence the deposition flux, but also because there is a lack of experimental data covering all scenarios of interest. In this paper, that is the result of a National Research Program a research activity conducted by DEIM Department of the University of Palermo and ENEA and funded by the Italian Minister of Economic Development, a new schema for parameterization of particle dry deposition velocity on urban are…

Settore ING-IND/19 - Impianti Nuclearidry deposition process urban surfaces radioactive particles Air Pollution
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Atmospheric dry deposition processes of particles on urban and suburban surfaces: Modelling and validation works

2019

Abstract Dry deposition process is one of the important pathways for the removal of particles from atmosphere. It is the result of a combination of different environmental and physical factors as atmospheric conditions, particle properties, characteristics of the canopy. For this latter factor, urban canopy represents unevenly combinations of different types of surface elements that increases the complexity of deposition process phenomena. Therefore, particle dry deposition on urban surfaces is not easy to configure and, although empirical or semi-empirical models in literature have been developed to address this aspect, there is not standardized and commonly accepted criteria, especially f…

Urban surfaceCanopyAtmospheric ScienceBrownian diffusion resistance; Coarse particles; Dry deposition process; Nuclear power plant accidents; Submicron particles; Urban canopy010504 meteorology & atmospheric sciencesNuclear power plant accidentCoarse particlesNuclear power plant accidents010501 environmental sciencesAtmospheric sciences01 natural sciencesUrban canopyAtmosphereSurface roughnessBrownian diffusion resistanceSubmicron particlesDry deposition proceSettore ING-IND/19 - Impianti Nucleari0105 earth and related environmental sciencesGeneral Environmental ScienceDry deposition processParticle propertiesCoarse particleSubmicron particleUrban canopyDry deposition processUrban canopyBrownian diffusion resistanceNuclear power plant accidentsCoarse particlesSubmicron particlesParticleEnvironmental scienceDeposition process
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Urban Surface Energy Balance Models: Model Characteristics and Methodology for a Comparison Study

2009

Many urban surface energy balance models now exist. These vary in complexity from simple schemes that represent the city as a concrete slab, to those which incorporate detailed representations of momentum and energy fluxes distributed within the atmospheric boundary layer. While many of these schemes have been evaluated against observations, with some models even compared with the same data sets, such evaluations have not been undertaken in a controlled manner to enable direct comparison. For other types of climate model, for instance the Project for Intercomparison of Land-Surface Parameterization Schemes (PILPS) experiments (Henderson-Sellers et al., 1993), such controlled comparisons hav…

Urban surfacePhysicsHeat fluxMeteorologyPlanetary boundary layerLatent heatEnergy balanceKey (cryptography)Climate modelUrban heat islandIndustrial engineering
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