Assessment of Surface Urban Heat Island in Three Cities Surrounded by Different Types of Land-Cover Using Satellite Imag
- PDF / 10,317,209 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 67 Downloads / 200 Views
RESEARCH ARTICLE
Assessment of Surface Urban Heat Island in Three Cities Surrounded by Different Types of Land-Cover Using Satellite Images Shahabeddin Sherafati1 • M. R. Saradjian1 • Amirhossein Rabbani1 Received: 8 May 2017 / Accepted: 8 November 2017 Ó Indian Society of Remote Sensing 2018
Abstract Land-cover change is the main factor of Land Surface Temperature (LST) variation in urban areas. The temperature of man-made classes within cities is normally higher than natural classes in the surrounding areas which leads to the Urban Heat Island (UHI) phenomenon. In this study, LST maps of three cities (i.e. Paris, Riyadh and Manama) are analyzed to investigate how SUHI reacts in different cities. The SUHI intensity during summer and winter is also assessed to understand the seasonal changes of SUHI. The Advanced Very High Resolution Radiometer (AVHRR) images have been used as the main data source for investigating temperature variability in the urban areas. However, in order to define different types of land-cover and correlate those with AVHRR pixel values, one of Landsat sensors have also been used in each case. These include Thematic Mapper, Enhanced Thematic Mapper or Operational Land Imager, depending on their synchronization with the AVHRR images. The analysis of the temperature variation showed that the behavior of SUHI is not the same in different cities and is dependent on the land-covers surrounding the city. Keywords Urban climate Satellite images Urban heat island Thermal inertia
Introduction Urban areas are comprised of different types of land-cover each with their own thermal properties. The difference between temperatures of various land-covers forms the Urban Heat Island (UHI) (Rinner and Hussain 2011). The main focus is particularly on the temperature of urban areas being higher compared to the surrounding rural areas. Numerous studies on urban climate have shown that the most effective factor on UHI is the land-cover change especially vegetation and bare soil conversion to concrete, asphalt and other man-made structures (Rinner and Hussain 2011). & Shahabeddin Sherafati [email protected] M. R. Saradjian [email protected] Amirhossein Rabbani [email protected] 1
Remote Sensing Division, School of Surveying and Geospatial Engineering, College of Engineering, University of Tehran, Tehran, Iran
In global scale, human activities especially those related to burning fossil fuels increase the amount of carbon dioxide which in turn may increase the temperature. However, in local scale of an urban area, the main factors leading to temperature increase due to the changes in landcover are: (1) physical characteristic changes of the surface (e.g. albedo and thermal capacity), (2) the decrease of surface moisture available for evapotranspiration and (3) change of the radiative fluxes and near surface heat flow caused by geometric features of the city surface (Dousset and Gourmelon 2003). Each city has its own particular environment and specific land-cover types making UHI react dif
Data Loading...
