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Please use this identifier to cite or link to this item: http://hdl.handle.net/10805/1525

Title: Interazione tra correnti di pendio ed isola urbana di calore
Authors: GIORGILLI, MARCO
Tutor: CENEDESE, ANTONIO
MORONI, MONICA
Keywords: Atmospheric boundary layer
Anabatic wind
Katabatic wind
Urban heat island
Issue Date: 5-Jun-2012
Abstract: An experimental study about two-dimensional upslope and downslope flows in a stably stratified environment and about their interaction with an urban heat island placed in a valley is presented. Two different configurations are reconstructed in a laboratory model: an open valley at the bottom of a slope and a valley closed between two symmetric slopes. The slope flows are generated heating or cooling the slopes by Peltier cells. The urban heat island is simulated by an electric resistance placed within the valley. The main features of the circulation driven by the thermal exchanges are studied using an image analysis technique, named Feature Tracking, that allows a Lagrangian reconstruction of the motion. The distributions of the velocity and of its second order statistics along some profiles are displayed; the temperature profiles are obtained from measurements with thermocouples. The experimental tests display that the slope flows affect strongly the urban heat islands in both configurations: in the open valley the urban heat island is strongly deformed and nearly destroyed by the slope flow and a recirculating zone takes place; in the closed valley the urban heat island circulation is weakened by the anabatic flows and it is enhanced by the katabatic flows.
Description: The text of the work is composed by 5 chapters: 1) Introductory description of the anabatic and katabatic flows and of the urban heat island as phenomena of the atmospheric boundary layer, with several references to the state of art; 2) Detailed description of the experimental setup and procedures; 3) Presentation of the experimental results; 4) Comparison between some results of this work an the results of other works; 5) Main conclusions of the study.
URI: http://hdl.handle.net/10805/1525
Research interests: Experimental fluid dynamics, Atmospheric boundary layer phenomena, Problems of air quality.
Skills short description: Practical knowledge of temperature and velocity measurement techniques in laboratory. Carrying out of laboratory simulation of local circulation phenomena.
Personal skills keywords: Laboratory measurements
Slope flows
Urban heat island
Velocimetry image analysis techniques
Appears in PhD:INGEGNERIA IDRAULICA

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