Study on Dynamic Evolvement Process of the Urban Heat Island in Taiyuan

Since the 20th century,more and more environmental problems had appeared with the advancement of urbanization.Among those problems,urban heat island phenomenon was specially obvious.Taiyuan city,a national important energy industrial city,was chosen to analysis the characteristics of urban heat island effect in the urbanization process.With the aid of RS,GIS methods,spatio-temporal distribution characteristics of urban heat island effects were analyzed based on the data of Landsat Thematic Mapper(TM) in 1986,1995 and the Enhanced Thematic Mapper(ETM) in 2001 of Taiyuan city.Results showed that urban sprawl and industrial district construction were main driving forces of urban heat island effects.Heat island intensity was affected by the nature of urban underlaying surface,man-made heat and exhaust emission.Greenbelt and water body could weaken urban heat island effects.Some main principles and measures for the city landscape planning were proposed.