Some characteristics of the urban boundary layer above Rome, Italy, and applicability of Monin–Obukhov similarity

Pelliccioni, Armando; Monti, Paolo; Gariazzo, Claudio; Leuzzi, Giovanni

doi:10.1007/s10652-012-9246-3

Cited by 26 publications

(14 citation statements)

References 38 publications

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“…Experimental analysis conducted in the same urban complex considered in the present study [25] reveals that, at least for neutral conditions, the optimal value of z 0 to be inserted in Eq. (1) decreases with height.…”

Section: Introductionmentioning

confidence: 79%

“…: above the surface seems to exist. Since the footprint analysis performed by [25] suggests that the flow at VP is strongly affected by the city, this means that a RSL is present and that u * is nearly-constant therein. Therefore, the classical log-law with constant roughness length might be invalid in that portion of the UBL even if a quasi-constant flux layer is present.…”

Section: Experimental Evidencementioning

confidence: 99%

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An alternative wind profile formulation for urban areas in neutral conditions

2014

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On the basis of meteorological observations conducted within the city of Rome, Italy, a new formulation of the wind-speed profile valid in urban areas and neutral conditions is developed. It is found that the role played by the roughness length in the canonical log-law profile can be taken by a local length scale, depending on both the surface cover and the distance above the ground surface, which follows a pattern of exponential decrease with height. The results show that the proposed model leads to increased performance compared with that obtained by using other approaches found in the literature.

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Section: Introductionmentioning

confidence: 79%

Section: Experimental Evidencementioning

confidence: 99%

An alternative wind profile formulation for urban areas in neutral conditions

2014

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“…Besides experimental studies, some numerical analysis on the UHI over the metropolitan region of Rome and the influence of the sea breeze on the urban boundary layer have been recently presented [29,30].…”

Section: Introductionmentioning

confidence: 99%

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Salvati

Roura²,

Cecere

2017

Energy and Buildings

165

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Highlights The maximum urban heat island intensity(UHI) reaches 4.3°C during summer  During daytime, air temperatures at the street level are higher than the roof level  The sea breeze has a positive effect on the roof level temperatures during summer  The UHI determines an average increase of the cooling load between 18% and 28%  The energy impact of the UHI is more relevant for higher solar gains Abstract: The Urban Heat Island (UHI) effect is particularly concerning in Mediterranean zone, as climate change and UHI scenarios foresee a fast growth of energy consumption for next years, due to the widespread of air conditioning systems and the increase of cooling demand. The UHI intensity is thus a key variable for the prediction of energy needs in urban areas.This study investigates the intensity of UHI in Barcelona (Spain), the densest Mediterranean coastal city, and its impact on cooling demand of residential buildings.The experimental analysis is based on temperature data from rural and urban Weather Stations and field measurements at street level. The maximum average UHI intensity is found to be 2.8 °C in winter and 1.7°C in summer, reaching 4.3°C at street level. Simulations performed with EnergyPlus indicate that the UHI intensity increases the sensible cooling load of residential buildings by around 18% to 28%, depending on UHI intensity, amount of solar gains and cooling set point.In the light of the results, the UHI intensity in Mediterranean context should be properly considered in performing energy evaluations for urban contexts, since standard meteorological data from airport weather stations are not found to be accurate enough.

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“…The friction velocity f V is given by the following equation [5,25], we proposed the following formula:…”

Section: Methodology and Theoretical Backgroundmentioning

confidence: 99%

Meteorological Factors Affecting Chimney Design Parameters

Challan¹

2014

JNSM

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The height of mechanical mixing layer is one of the parameter of the safety analysis report of any industrial (nuclear) facility due to its relation to the dispersion factor of pollutants. It can provide information about lower atmospheric dispersion, which is usually used to study the pollutants released from nuclear facility, risk analysis and emergency planning. Mixing layer height is difficult to measure; therefore, mathematical methods are introduced to calculate this layer. The analysis of the results showed that the height variation of the mechanical mixing layer for different seasons depends on the degree of unstable condition and wind speed, where the height of the mechanical mixing layer equals 2433 m at wind speed of 14.5 m/s and 1952 m at wind speed of 14 m/s and 1700 m at wind speed of 13 m/s. The purpose of this work is to calculate the mechanical mixing layer height (HABL)mech. using different mechanical models during stable/unstable conditions. This value is one of the key parameter of the safety analysis report of any nuclear facility and important in the prediction of pollutants concentration released from any nuclear facility and the scaling of turbulence. The suggested model successfully calculate the pollutants profiles during the monthly seasons study depends on the degree of instability conditions, wind speed and predicted the maximum height of mixing layer.

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Some characteristics of the urban boundary layer above Rome, Italy, and applicability of Monin–Obukhov similarity

Cited by 26 publications

References 38 publications

An alternative wind profile formulation for urban areas in neutral conditions

An alternative wind profile formulation for urban areas in neutral conditions

Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study

Meteorological Factors Affecting Chimney Design Parameters

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