DBPapers

EXPLORATORY TECHNIQUES AND ANALYSIS OF HEAT ISLANDS IN ROMANIA

AUTHOR/S: A. VIRSTA, S. CAZANESCU, R. CAZANESCU, R. MANEA
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 573-580 pp

ABSTRACT

Remote sensing techniques were used to detect the heat islands over the Romanian
region, based on multi-temporal Meteosat Second Generation, Land Surface Analysis
Satellite Applications Facility/ Land Surface Temperature products (MSG
LSASAF/LST). A method was proposed for the rapid and accurate mapping of heat
island areas based on the combinational use of normalized land surface temperatures. In
order to do it, the IDL routines developed locally have been used. It was studied 2976
LSA-SAF/LST images acquired during the period of August 2008 and it were used to
calculate LST parameters. The LST values from 15 August 2008 were used to detect
expansion and heat islands changes over the Romanian region. The LST product has a
temporal resolution of 15 minutes. The LST values can be determined, theoretically, 96
times per day.

One of the main causes of urban heat island phenomenon are buildings and
streets/pavements which accumulate heat during day time and release it at night, back
into the atmosphere, warming the area. As a consequence of the heat accumulation, the
air temperature is higher inside buildings, particularly in inner spaces of residential and
commercial buildings with poor thermal isolation. In order to assure an adequate
interior temperature, the overall energy consumption for cooling (i.e. refrigeration and
air-conditioning) becomes higher, hence increasing the energy production by power
plants, meaning more costs to citizens and inducing significant economic impacts.
Thermal rehabilitation of the buildings is a proven solution to decrease the energy
consumptions for cooling and helps to the improving of the interior comfort for the
occupants.

Keywords: heat islands, satellite imagery, cooling consumption, thermal rehabilitation.